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V4L/DVB (6609): Re-adds lock safe videobuf_read_start 

videobuf_dvb needs videobuf_read_start. The EXPORT_SYMBOL_GPL() were removed by
a previous patch. However, videobuf_dvb needs this.

This patch re-adds videobuf_read_start, doing the proper lock.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2007-11-15 23:09:30 -03:00
parent 4af7565303
commit 19fb145799
1 changed files with 13 additions and 1 deletions
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14
drivers/media/video/videobuf-core.c
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@ -806,7 +806,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q,
}
/* Locking: Caller holds q->lock */
int videobuf_read_start(struct videobuf_queue *q)
int __videobuf_read_start(struct videobuf_queue *q)
{
enum v4l2_field field;
unsigned long flags=0;
@ -862,6 +862,17 @@ static void __videobuf_read_stop(struct videobuf_queue *q)
}
int videobuf_read_start(struct videobuf_queue *q)
{
int rc;
mutex_lock(&q->lock);
rc = __videobuf_read_start(q);
mutex_unlock(&q->lock);
return rc;
}
void videobuf_read_stop(struct videobuf_queue *q)
{
mutex_lock(&q->lock);
@ -1058,6 +1069,7 @@ EXPORT_SYMBOL_GPL(videobuf_dqbuf);
EXPORT_SYMBOL_GPL(videobuf_streamon);
EXPORT_SYMBOL_GPL(videobuf_streamoff);
EXPORT_SYMBOL_GPL(videobuf_read_start);
EXPORT_SYMBOL_GPL(videobuf_read_stop);
EXPORT_SYMBOL_GPL(videobuf_stop);
EXPORT_SYMBOL_GPL(videobuf_read_stream);