Searched defs:mmap_sem (Results 1 - 1 of 1) sorted by relevance

/drivers/media/video/
H A Dvideobuf2-core.c1079 struct rw_semaphore *mmap_sem = NULL; local
1089 * held. To avoid a AB-BA deadlock (mmap_sem then driver's lock in
1090 * mmap and driver's lock then mmap_sem in qbuf) the videobuf2 core
1091 * release driver's lock, takes mmap_sem and then takes again driver's
1100 mmap_sem = &current->mm->mmap_sem;
1102 down_read(mmap_sem);
1170 if (mmap_sem)
1171 up_read(mmap_sem);

Completed in 82 milliseconds