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Commit 19fb1457 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
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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: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 4af75653

drivers/media/video/videobuf-core.c

+13 −1
Original line number Diff line number Diff line
@@ -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);