diff options
| author | Hans Verkuil | 2010-09-20 22:24:30 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2010-10-21 05:06:14 +0200 |
| commit | 97397687886aa8ecd4ec603fab9e70e970c11597 (patch) | |
| tree | 339d460b43d2ec7206c9d147d2ad6f8fcbfa3870 /drivers/media/video/v4l2-mem2mem.c | |
| parent | V4L/DVB: v4l2: add core serialization lock (diff) | |
| download | kernel-qcow2-linux-97397687886aa8ecd4ec603fab9e70e970c11597.tar.gz kernel-qcow2-linux-97397687886aa8ecd4ec603fab9e70e970c11597.tar.xz kernel-qcow2-linux-97397687886aa8ecd4ec603fab9e70e970c11597.zip | |
V4L/DVB: videobuf: prepare to make locking optional in videobuf
Currently videobuf uses the vb_lock mutex to lock its data structures.
But this locking will (optionally) move into the v4l2 core, which means
that in that case vb_lock shouldn't be used since the external lock is already
held.
Prepare for this by adding a pointer to such an external mutex and
don't lock if that pointer is set.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/v4l2-mem2mem.c')
| -rw-r--r-- | drivers/media/video/v4l2-mem2mem.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/media/video/v4l2-mem2mem.c b/drivers/media/video/v4l2-mem2mem.c index f45f9405ea39..ac832a28e18e 100644 --- a/drivers/media/video/v4l2-mem2mem.c +++ b/drivers/media/video/v4l2-mem2mem.c @@ -421,8 +421,8 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, src_q = v4l2_m2m_get_src_vq(m2m_ctx); dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); - mutex_lock(&src_q->vb_lock); - mutex_lock(&dst_q->vb_lock); + videobuf_queue_lock(src_q); + videobuf_queue_lock(dst_q); if (src_q->streaming && !list_empty(&src_q->stream)) src_vb = list_first_entry(&src_q->stream, @@ -450,8 +450,8 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, } end: - mutex_unlock(&dst_q->vb_lock); - mutex_unlock(&src_q->vb_lock); + videobuf_queue_unlock(dst_q); + videobuf_queue_unlock(src_q); return rc; } EXPORT_SYMBOL_GPL(v4l2_m2m_poll); |