mirror of https://gitee.com/openkylin/linux.git
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>
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@ -806,7 +806,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q,
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}
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/* Locking: Caller holds q->lock */
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int videobuf_read_start(struct videobuf_queue *q)
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int __videobuf_read_start(struct videobuf_queue *q)
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{
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enum v4l2_field field;
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unsigned long flags=0;
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@ -862,6 +862,17 @@ static void __videobuf_read_stop(struct videobuf_queue *q)
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}
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int videobuf_read_start(struct videobuf_queue *q)
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{
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int rc;
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mutex_lock(&q->lock);
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rc = __videobuf_read_start(q);
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mutex_unlock(&q->lock);
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return rc;
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}
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void videobuf_read_stop(struct videobuf_queue *q)
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{
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mutex_lock(&q->lock);
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@ -1058,6 +1069,7 @@ EXPORT_SYMBOL_GPL(videobuf_dqbuf);
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EXPORT_SYMBOL_GPL(videobuf_streamon);
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EXPORT_SYMBOL_GPL(videobuf_streamoff);
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EXPORT_SYMBOL_GPL(videobuf_read_start);
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EXPORT_SYMBOL_GPL(videobuf_read_stop);
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EXPORT_SYMBOL_GPL(videobuf_stop);
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EXPORT_SYMBOL_GPL(videobuf_read_stream);
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