diff options
Diffstat (limited to 'drivers/media/video/videobuf-core.c')
| -rw-r--r-- | drivers/media/video/videobuf-core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c index 3bd06bb633a..a27e114cace 100644 --- a/drivers/media/video/videobuf-core.c +++ b/drivers/media/video/videobuf-core.c @@ -349,6 +349,9 @@ int videobuf_qbuf(struct videobuf_queue *q, MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); + if (b->memory == V4L2_MEMORY_MMAP) + down_read(¤t->mm->mmap_sem); + mutex_lock(&q->lock); retval = -EBUSY; if (q->reading) { @@ -434,6 +437,10 @@ int videobuf_qbuf(struct videobuf_queue *q, done: mutex_unlock(&q->lock); + + if (b->memory == V4L2_MEMORY_MMAP) + up_read(¤t->mm->mmap_sem); + return retval; } |