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V4L/DVB (7556): em28xx: fix locking on vidioc_s_fmt_cap 

Currently, vidioc_s_fmt_cap is allowed even if streaming is running on some
other fh. This is likely to cause issues.

Block use of vidioc_s_fmt_cap if someone else has claimed access to the device.

Signed-off-by: Aidan Thornton <makosoft@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Aidan Thornton 2008-04-13 15:02:24 -03:00 committed by Mauro Carvalho Chehab
parent b957dfdc31
commit 0ea13e6e59
1 changed files with 6 additions and 0 deletions
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6
drivers/media/video/em28xx/em28xx-video.c
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@ -947,6 +947,12 @@ static int vidioc_s_fmt_cap(struct file *file, void *priv,
goto out;
}
if (dev->stream_on && !fh->stream_on) {
em28xx_errdev("%s device in use by another fh\n", __func__);
rc = -EBUSY;
goto out;
}
/* set new image size */
dev->width = f->fmt.pix.width;
dev->height = f->fmt.pix.height;