From 1a17948184a3320e0bb0aab561112211d2e9b7a8 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 4 Mar 2014 07:28:11 -0300 Subject: [PATCH] [media] pwc: do not decompress the image unless the state is DONE 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/pwc/pwc-if.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c index 1a27096b3f91..84a6720b1d00 100644 --- a/drivers/media/usb/pwc/pwc-if.c +++ b/drivers/media/usb/pwc/pwc-if.c @@ -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) -- 2.20.1