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[media] pwc: do not decompress the image unless the state is DONE

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There is no point in trying to decompress a captured frame unless
the buffer state is OK. It won't be used in any other state, and
in fact the contents of the buffer might well be corrupt.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil 2014-03-04 07:28:11 -03:00 committed by Mauro Carvalho Chehab
parent 0647064293
commit 1a17948184
1 changed files with 9 additions and 6 deletions
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15
drivers/media/usb/pwc/pwc-if.c
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@ -619,12 +619,15 @@ static void buffer_finish(struct vb2_buffer *vb)
struct pwc_device *pdev = vb2_get_drv_priv(vb->vb2_queue);
struct pwc_frame_buf *buf = container_of(vb, struct pwc_frame_buf, vb);
/*
* Application has called dqbuf and is getting back a buffer we've
* filled, take the pwc data we've stored in buf->data and decompress
* it into a usable format, storing the result in the vb2_buffer
*/
pwc_decompress(pdev, buf);
if (vb->state == VB2_BUF_STATE_DONE) {
/*
* Application has called dqbuf and is getting back a buffer
* we've filled, take the pwc data we've stored in buf->data
* and decompress it into a usable format, storing the result
* in the vb2_buffer.
*/
pwc_decompress(pdev, buf);
}
}
static void buffer_cleanup(struct vb2_buffer *vb)