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authorHans Verkuil <hverkuil@xs4all.nl>2010-09-20 17:24:30 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-10-21 01:06:14 -0200
commit97397687886aa8ecd4ec603fab9e70e970c11597 (patch)
tree339d460b43d2ec7206c9d147d2ad6f8fcbfa3870 /include
parentee6869afc922a9849979e49bb3bbcad794872fcb (diff)
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 'include')
-rw-r--r--include/media/videobuf-core.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
index f2c41cebf453..f5eb2cbf3002 100644
--- a/include/media/videobuf-core.h
+++ b/include/media/videobuf-core.h
@@ -139,6 +139,7 @@ struct videobuf_qtype_ops {
struct videobuf_queue {
struct mutex vb_lock;
+ struct mutex *ext_lock;
spinlock_t *irqlock;
struct device *dev;
@@ -167,6 +168,18 @@ struct videobuf_queue {
void *priv_data;
};
+static inline void videobuf_queue_lock(struct videobuf_queue *q)
+{
+ if (!q->ext_lock)
+ mutex_lock(&q->vb_lock);
+}
+
+static inline void videobuf_queue_unlock(struct videobuf_queue *q)
+{
+ if (!q->ext_lock)
+ mutex_unlock(&q->vb_lock);
+}
+
int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
struct v4l2_framebuffer *fbuf);

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