12a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King/* 22a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * Componentized device handling. 32a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * 42a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * This program is free software; you can redistribute it and/or modify 52a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * it under the terms of the GNU General Public License version 2 as 62a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * published by the Free Software Foundation. 72a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * 82a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * This is work in progress. We gather up the component devices into a list, 92a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * and bind them when instructed. At the moment, we're specific to the DRM 102a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * subsystem, and only handles one master device, but this doesn't have to be 112a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * the case. 122a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King */ 132a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/component.h> 142a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/device.h> 152a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/kref.h> 162a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/list.h> 172a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/module.h> 182a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/mutex.h> 192a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King#include <linux/slab.h> 202a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 216955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingstruct component_match { 226955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King size_t alloc; 236955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King size_t num; 246955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct { 256955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King void *data; 266955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King int (*fn)(struct device *, void *); 276955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King } compare[0]; 286955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King}; 296955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 302a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstruct master { 312a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct list_head node; 322a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct list_head components; 332a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King bool bound; 342a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 352a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King const struct component_master_ops *ops; 362a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct device *dev; 376955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct component_match *match; 382a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King}; 392a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 402a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstruct component { 412a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct list_head node; 422a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct list_head master_node; 432a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *master; 442a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King bool bound; 452a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 462a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King const struct component_ops *ops; 472a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct device *dev; 482a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King}; 492a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 502a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic DEFINE_MUTEX(component_mutex); 512a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic LIST_HEAD(component_list); 522a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic LIST_HEAD(masters); 532a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 542a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic struct master *__master_find(struct device *dev, 552a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King const struct component_master_ops *ops) 562a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 572a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *m; 582a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 592a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry(m, &masters, node) 602a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (m->dev == dev && (!ops || m->ops == ops)) 612a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return m; 622a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 632a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return NULL; 642a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 652a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 662a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King/* Attach an unattached component to a master. */ 672a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic void component_attach_master(struct master *master, struct component *c) 682a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 692a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King c->master = master; 702a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 712a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_add_tail(&c->master_node, &master->components); 722a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 732a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 742a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King/* Detach a component from a master. */ 752a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic void component_detach_master(struct master *master, struct component *c) 762a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 772a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_del(&c->master_node); 782a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 792a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King c->master = NULL; 802a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 812a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 82fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King/* 83fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King * Add a component to a master, finding the component via the compare 84fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King * function and compare data. This is safe to call for duplicate matches 85fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King * and will not result in the same component being added multiple times. 86fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King */ 872a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingint component_master_add_child(struct master *master, 882a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int (*compare)(struct device *, void *), void *compare_data) 892a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 902a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *c; 912a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int ret = -ENXIO; 922a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 932a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry(c, &component_list, node) { 94fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King if (c->master && c->master != master) 952a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King continue; 962a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 972a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (compare(c->dev, compare_data)) { 98fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King if (!c->master) 99fcbcebce7159c928692dc6a5e88869f6e44438b9Russell King component_attach_master(master, c); 1002a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King ret = 0; 1012a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King break; 1022a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 1032a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 1042a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1052a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret; 1062a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 1072a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_master_add_child); 1082a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1096955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingstatic int find_components(struct master *master) 1106955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King{ 1116955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct component_match *match = master->match; 1126955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King size_t i; 1136955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King int ret = 0; 1146955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 1156955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (!match) { 1166955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King /* 1176955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * Search the list of components, looking for components that 1186955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * belong to this master, and attach them to the master. 1196955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King */ 1206955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return master->ops->add_components(master->dev, master); 1216955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King } 1226955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 1236955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King /* 1246955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * Scan the array of match functions and attach 1256955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * any components which are found to this master. 1266955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King */ 1276955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King for (i = 0; i < match->num; i++) { 1286955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King ret = component_master_add_child(master, 1296955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King match->compare[i].fn, 1306955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King match->compare[i].data); 1316955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (ret) 1326955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King break; 1336955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King } 1346955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return ret; 1356955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King} 1366955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 1372a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King/* Detach all attached components from this master */ 1382a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic void master_remove_components(struct master *master) 1392a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 1402a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King while (!list_empty(&master->components)) { 1412a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *c = list_first_entry(&master->components, 1422a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component, master_node); 1432a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1442a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King WARN_ON(c->master != master); 1452a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1462a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component_detach_master(master, c); 1472a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 1482a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 1492a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1502a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King/* 1512a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * Try to bring up a master. If component is NULL, we're interested in 1522a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * this master, otherwise it's a component which must be present to try 1532a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * and bring up the master. 1542a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * 1552a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * Returns 1 for successful bringup, 0 if not ready, or -ve errno. 1562a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King */ 1572a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic int try_to_bring_up_master(struct master *master, 1582a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *component) 1592a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 160c334940ea26cb58f5514dcbb225a3f397b2684adRussell King int ret; 161c334940ea26cb58f5514dcbb225a3f397b2684adRussell King 162c334940ea26cb58f5514dcbb225a3f397b2684adRussell King if (master->bound) 163c334940ea26cb58f5514dcbb225a3f397b2684adRussell King return 0; 164c334940ea26cb58f5514dcbb225a3f397b2684adRussell King 165c334940ea26cb58f5514dcbb225a3f397b2684adRussell King /* 166c334940ea26cb58f5514dcbb225a3f397b2684adRussell King * Search the list of components, looking for components that 167c334940ea26cb58f5514dcbb225a3f397b2684adRussell King * belong to this master, and attach them to the master. 168c334940ea26cb58f5514dcbb225a3f397b2684adRussell King */ 1696955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (find_components(master)) { 170c334940ea26cb58f5514dcbb225a3f397b2684adRussell King /* Failed to find all components */ 171c334940ea26cb58f5514dcbb225a3f397b2684adRussell King ret = 0; 172c334940ea26cb58f5514dcbb225a3f397b2684adRussell King goto out; 173c334940ea26cb58f5514dcbb225a3f397b2684adRussell King } 1742a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 175c334940ea26cb58f5514dcbb225a3f397b2684adRussell King if (component && component->master != master) { 176c334940ea26cb58f5514dcbb225a3f397b2684adRussell King ret = 0; 177c334940ea26cb58f5514dcbb225a3f397b2684adRussell King goto out; 178c334940ea26cb58f5514dcbb225a3f397b2684adRussell King } 1792a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 180c334940ea26cb58f5514dcbb225a3f397b2684adRussell King if (!devres_open_group(master->dev, NULL, GFP_KERNEL)) { 181c334940ea26cb58f5514dcbb225a3f397b2684adRussell King ret = -ENOMEM; 182c334940ea26cb58f5514dcbb225a3f397b2684adRussell King goto out; 183c334940ea26cb58f5514dcbb225a3f397b2684adRussell King } 1842a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 185c334940ea26cb58f5514dcbb225a3f397b2684adRussell King /* Found all components */ 186c334940ea26cb58f5514dcbb225a3f397b2684adRussell King ret = master->ops->bind(master->dev); 187c334940ea26cb58f5514dcbb225a3f397b2684adRussell King if (ret < 0) { 188c334940ea26cb58f5514dcbb225a3f397b2684adRussell King devres_release_group(master->dev, NULL); 189c334940ea26cb58f5514dcbb225a3f397b2684adRussell King dev_info(master->dev, "master bind failed: %d\n", ret); 190c334940ea26cb58f5514dcbb225a3f397b2684adRussell King goto out; 191c334940ea26cb58f5514dcbb225a3f397b2684adRussell King } 1929e1ccb4a7700fcb3ddfe2767e0bbb6131f8ab54eRussell King 193c334940ea26cb58f5514dcbb225a3f397b2684adRussell King master->bound = true; 194c334940ea26cb58f5514dcbb225a3f397b2684adRussell King return 1; 1952a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1962a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingout: 197c334940ea26cb58f5514dcbb225a3f397b2684adRussell King master_remove_components(master); 1982a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 1992a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret; 2002a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 2012a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2022a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic int try_to_bring_up_masters(struct component *component) 2032a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 2042a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *m; 2052a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int ret = 0; 2062a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2072a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry(m, &masters, node) { 2082a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King ret = try_to_bring_up_master(m, component); 2092a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (ret != 0) 2102a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King break; 2112a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 2122a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2132a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret; 2142a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 2152a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2162a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic void take_down_master(struct master *master) 2172a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 2182a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (master->bound) { 2192a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master->ops->unbind(master->dev); 2209e1ccb4a7700fcb3ddfe2767e0bbb6131f8ab54eRussell King devres_release_group(master->dev, NULL); 2212a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master->bound = false; 2222a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 2232a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2242a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master_remove_components(master); 2252a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 2262a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2276955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingstatic size_t component_match_size(size_t num) 2286955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King{ 2296955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return offsetof(struct component_match, compare[num]); 2306955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King} 2316955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2326955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingstatic struct component_match *component_match_realloc(struct device *dev, 2336955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct component_match *match, size_t num) 2346955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King{ 2356955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct component_match *new; 2366955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2376955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (match && match->alloc == num) 2386955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return match; 2396955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2406955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King new = devm_kmalloc(dev, component_match_size(num), GFP_KERNEL); 2416955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (!new) 2426955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return ERR_PTR(-ENOMEM); 2436955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2446955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (match) { 2456955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King memcpy(new, match, component_match_size(min(match->num, num))); 2466955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King devm_kfree(dev, match); 2476955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King } else { 2486955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King new->num = 0; 2496955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King } 2506955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2516955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King new->alloc = num; 2526955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2536955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return new; 2546955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King} 2556955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2566955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King/* 2576955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * Add a component to be matched. 2586955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * 2596955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King * The match array is first created or extended if necessary. 2606955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King */ 2616955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingvoid component_match_add(struct device *dev, struct component_match **matchptr, 2626955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King int (*compare)(struct device *, void *), void *compare_data) 2636955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King{ 2646955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct component_match *match = *matchptr; 2656955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2666955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (IS_ERR(match)) 2676955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return; 2686955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2696955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (!match || match->num == match->alloc) { 2706955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King size_t new_size = match ? match->alloc + 16 : 15; 2716955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2726955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King match = component_match_realloc(dev, match, new_size); 2736955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2746955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King *matchptr = match; 2756955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2766955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (IS_ERR(match)) 2776955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return; 2786955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King } 2796955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2806955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King match->compare[match->num].fn = compare; 2816955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King match->compare[match->num].data = compare_data; 2826955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King match->num++; 2836955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King} 2846955b58254c2bcee8a7b55ce06468a645dc98ec5Russell KingEXPORT_SYMBOL(component_match_add); 2856955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 2866955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingint component_master_add_with_match(struct device *dev, 2876955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King const struct component_master_ops *ops, 2886955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King struct component_match *match) 2892a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 2902a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *master; 2912a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int ret; 2922a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 2936955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King if (ops->add_components && match) 2946955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return -EINVAL; 2956955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 296b509cc802239a8b5ba7d1d2cc5adfb9d984b7ed8Russell King if (match) { 297b509cc802239a8b5ba7d1d2cc5adfb9d984b7ed8Russell King /* Reallocate the match array for its true size */ 298b509cc802239a8b5ba7d1d2cc5adfb9d984b7ed8Russell King match = component_match_realloc(dev, match, match->num); 299b509cc802239a8b5ba7d1d2cc5adfb9d984b7ed8Russell King if (IS_ERR(match)) 300b509cc802239a8b5ba7d1d2cc5adfb9d984b7ed8Russell King return PTR_ERR(match); 301b509cc802239a8b5ba7d1d2cc5adfb9d984b7ed8Russell King } 3026955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 3032a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master = kzalloc(sizeof(*master), GFP_KERNEL); 3042a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!master) 3052a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return -ENOMEM; 3062a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3072a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master->dev = dev; 3082a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master->ops = ops; 3096955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King master->match = match; 3102a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King INIT_LIST_HEAD(&master->components); 3112a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3122a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King /* Add to the list of available masters. */ 3132a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_lock(&component_mutex); 3142a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_add(&master->node, &masters); 3152a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3162a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King ret = try_to_bring_up_master(master, NULL); 3172a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3182a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (ret < 0) { 3192a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King /* Delete off the list if we weren't successful */ 3202a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_del(&master->node); 3212a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King kfree(master); 3222a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 3232a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_unlock(&component_mutex); 3242a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3252a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret < 0 ? ret : 0; 3262a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 3276955b58254c2bcee8a7b55ce06468a645dc98ec5Russell KingEXPORT_SYMBOL_GPL(component_master_add_with_match); 3286955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King 3296955b58254c2bcee8a7b55ce06468a645dc98ec5Russell Kingint component_master_add(struct device *dev, 3306955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King const struct component_master_ops *ops) 3316955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King{ 3326955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King return component_master_add_with_match(dev, ops, NULL); 3336955b58254c2bcee8a7b55ce06468a645dc98ec5Russell King} 3342a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_master_add); 3352a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3362a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingvoid component_master_del(struct device *dev, 3372a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King const struct component_master_ops *ops) 3382a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 3392a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *master; 3402a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3412a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_lock(&component_mutex); 3422a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master = __master_find(dev, ops); 3432a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (master) { 3442a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King take_down_master(master); 3452a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3462a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_del(&master->node); 3472a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King kfree(master); 3482a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 3492a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_unlock(&component_mutex); 3502a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 3512a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_master_del); 3522a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3532a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic void component_unbind(struct component *component, 3542a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *master, void *data) 3552a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 3562a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King WARN_ON(!component->bound); 3572a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3582a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component->ops->unbind(component->dev, master->dev, data); 3592a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component->bound = false; 3602a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3612a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King /* Release all resources claimed in the binding of this component */ 3622a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King devres_release_group(component->dev, component); 3632a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 3642a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3652a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingvoid component_unbind_all(struct device *master_dev, void *data) 3662a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 3672a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *master; 3682a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *c; 3692a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3702a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King WARN_ON(!mutex_is_locked(&component_mutex)); 3712a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3722a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master = __master_find(master_dev, NULL); 3732a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!master) 3742a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return; 3752a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3762a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry_reverse(c, &master->components, master_node) 3772a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component_unbind(c, master, data); 3782a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 3792a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_unbind_all); 3802a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3812a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingstatic int component_bind(struct component *component, struct master *master, 3822a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King void *data) 3832a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 3842a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int ret; 3852a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3862a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King /* 3872a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * Each component initialises inside its own devres group. 3882a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * This allows us to roll-back a failed component without 3892a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * affecting anything else. 3902a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King */ 3912a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!devres_open_group(master->dev, NULL, GFP_KERNEL)) 3922a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return -ENOMEM; 3932a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 3942a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King /* 3952a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * Also open a group for the device itself: this allows us 3962a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * to release the resources claimed against the sub-device 3972a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * at the appropriate moment. 3982a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King */ 3992a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!devres_open_group(component->dev, component, GFP_KERNEL)) { 4002a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King devres_release_group(master->dev, NULL); 4012a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return -ENOMEM; 4022a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 4032a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4042a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_dbg(master->dev, "binding %s (ops %ps)\n", 4052a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_name(component->dev), component->ops); 4062a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4072a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King ret = component->ops->bind(component->dev, master->dev, data); 4082a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!ret) { 4092a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component->bound = true; 4102a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4112a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King /* 4122a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * Close the component device's group so that resources 4132a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * allocated in the binding are encapsulated for removal 4142a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * at unbind. Remove the group on the DRM device as we 4152a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King * can clean those resources up independently. 4162a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King */ 4172a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King devres_close_group(component->dev, NULL); 4182a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King devres_remove_group(master->dev, NULL); 4192a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4202a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_info(master->dev, "bound %s (ops %ps)\n", 4212a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_name(component->dev), component->ops); 4222a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } else { 4232a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King devres_release_group(component->dev, NULL); 4242a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King devres_release_group(master->dev, NULL); 4252a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4262a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_err(master->dev, "failed to bind %s (ops %ps): %d\n", 4272a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_name(component->dev), component->ops, ret); 4282a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 4292a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4302a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret; 4312a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 4322a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4332a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingint component_bind_all(struct device *master_dev, void *data) 4342a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 4352a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct master *master; 4362a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *c; 4372a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int ret = 0; 4382a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4392a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King WARN_ON(!mutex_is_locked(&component_mutex)); 4402a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4412a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master = __master_find(master_dev, NULL); 4422a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!master) 4432a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return -EINVAL; 4442a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4452a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry(c, &master->components, master_node) { 4462a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King ret = component_bind(c, master, data); 4472a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (ret) 4482a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King break; 4492a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 4502a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4512a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (ret != 0) { 4522a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry_continue_reverse(c, &master->components, 4532a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King master_node) 4542a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component_unbind(c, master, data); 4552a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 4562a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4572a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret; 4582a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 4592a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_bind_all); 4602a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4612a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingint component_add(struct device *dev, const struct component_ops *ops) 4622a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 4632a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *component; 4642a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King int ret; 4652a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4662a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component = kzalloc(sizeof(*component), GFP_KERNEL); 4672a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (!component) 4682a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return -ENOMEM; 4692a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4702a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component->ops = ops; 4712a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component->dev = dev; 4722a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4732a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King dev_dbg(dev, "adding component (ops %ps)\n", ops); 4742a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4752a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_lock(&component_mutex); 4762a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_add_tail(&component->node, &component_list); 4772a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4782a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King ret = try_to_bring_up_masters(component); 4792a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (ret < 0) { 4802a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_del(&component->node); 4812a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4822a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King kfree(component); 4832a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 4842a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_unlock(&component_mutex); 4852a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4862a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King return ret < 0 ? ret : 0; 4872a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 4882a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_add); 4892a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4902a41e6070dd7ef539d0f3b1652b4839d04378e11Russell Kingvoid component_del(struct device *dev, const struct component_ops *ops) 4912a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King{ 4922a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King struct component *c, *component = NULL; 4932a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 4942a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_lock(&component_mutex); 4952a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_for_each_entry(c, &component_list, node) 4962a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (c->dev == dev && c->ops == ops) { 4972a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King list_del(&c->node); 4982a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King component = c; 4992a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King break; 5002a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King } 5012a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 5022a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King if (component && component->master) 5032a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King take_down_master(component->master); 5042a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 5052a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King mutex_unlock(&component_mutex); 5062a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 5072a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King WARN_ON(!component); 5082a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King kfree(component); 5092a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King} 5102a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingEXPORT_SYMBOL_GPL(component_del); 5112a41e6070dd7ef539d0f3b1652b4839d04378e11Russell King 5122a41e6070dd7ef539d0f3b1652b4839d04378e11Russell KingMODULE_LICENSE("GPL v2"); 513