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| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-05-20 09:53:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-20 10:12:26 -0700 |
| commit | 81b2dbcad86732ffc02bad87aa25c4651199fc77 (patch) | |
| tree | 6c956c561fbaaa7e04ef612695bf5d3d0b5faef2 /include/media | |
| parent | babd90b274e6b43a7dc7bb08562bf566cbabdbf8 (diff) | |
| download | kernel-crypto-81b2dbcad86732ffc02bad87aa25c4651199fc77.tar.gz kernel-crypto-81b2dbcad86732ffc02bad87aa25c4651199fc77.tar.xz kernel-crypto-81b2dbcad86732ffc02bad87aa25c4651199fc77.zip | |
Fix a deadlock in the bttv driver
vidiocgmbuf() does this:
mutex_lock(&fh->cap.vb_lock);
retval = videobuf_mmap_setup(&fh->cap, gbuffers, gbufsize,
V4L2_MEMORY_MMAP);
and videobuf_mmap_setup() then just does
mutex_lock(&q->vb_lock);
ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
mutex_unlock(&q->vb_lock);
which is an obvious double-take deadlock.
This patch fixes this by having vidiocgmbuf() just call the
__videobuf_mmap_setup function instead.
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Reported-by: Koos Vriezen <koos.vriezen@gmail.com>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/videobuf-core.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h index 5b39a22533f..874f1340d04 100644 --- a/include/media/videobuf-core.h +++ b/include/media/videobuf-core.h @@ -237,6 +237,9 @@ unsigned int videobuf_poll_stream(struct file *file, int videobuf_mmap_setup(struct videobuf_queue *q, unsigned int bcount, unsigned int bsize, enum v4l2_memory memory); +int __videobuf_mmap_setup(struct videobuf_queue *q, + unsigned int bcount, unsigned int bsize, + enum v4l2_memory memory); int videobuf_mmap_free(struct videobuf_queue *q); int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma); |