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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>
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@ -947,6 +947,12 @@ static int vidioc_s_fmt_cap(struct file *file, void *priv,
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goto out;
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}
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if (dev->stream_on && !fh->stream_on) {
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em28xx_errdev("%s device in use by another fh\n", __func__);
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rc = -EBUSY;
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goto out;
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}
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/* set new image size */
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dev->width = f->fmt.pix.width;
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dev->height = f->fmt.pix.height;
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