diff options
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-video.c | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c index 90aedaeb09b..2d88afefecf 100644 --- a/drivers/media/video/em28xx/em28xx-video.c +++ b/drivers/media/video/em28xx/em28xx-video.c @@ -599,12 +599,10 @@ static int res_get(struct em28xx_fh *fh) return rc; if (dev->stream_on) - return -EINVAL; + return -EBUSY; - mutex_lock(&dev->lock); dev->stream_on = 1; fh->stream_on = 1; - mutex_unlock(&dev->lock); return rc; } @@ -1257,8 +1255,12 @@ static int vidioc_streamon(struct file *file, void *priv, return rc; - if (unlikely(res_get(fh) < 0)) - return -EBUSY; + mutex_lock(&dev->lock); + rc = res_get(fh); + mutex_unlock(&dev->lock); + + if (unlikely(rc < 0)) + return rc; return (videobuf_streamon(&fh->vb_vidq)); } @@ -1738,8 +1740,12 @@ em28xx_v4l2_read(struct file *filp, char __user *buf, size_t count, */ if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { - if (unlikely(res_get(fh))) - return -EBUSY; + mutex_lock(&dev->lock); + rc = res_get(fh); + mutex_unlock(&dev->lock); + + if (unlikely(rc < 0)) + return rc; return videobuf_read_stream(&fh->vb_vidq, buf, count, pos, 0, filp->f_flags & O_NONBLOCK); @@ -1761,7 +1767,11 @@ static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait) if (rc < 0) return rc; - if (unlikely(res_get(fh) < 0)) + mutex_lock(&dev->lock); + rc = res_get(fh); + mutex_unlock(&dev->lock); + + if (unlikely(rc < 0)) return POLLERR; if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type) @@ -1779,13 +1789,17 @@ static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma) struct em28xx *dev = fh->dev; int rc; - if (unlikely(res_get(fh) < 0)) - return -EBUSY; - rc = check_dev(dev); if (rc < 0) return rc; + mutex_lock(&dev->lock); + rc = res_get(fh); + mutex_unlock(&dev->lock); + + if (unlikely(rc < 0)) + return rc; + rc = videobuf_mmap_mapper(&fh->vb_vidq, vma); em28xx_videodbg("vma start=0x%08lx, size=%ld, ret=%d\n", |