[RFC PATCH 7/8] stk-webcam: zero the priv field of v4l2_pix_format.

[Hans Verkuil <hverkuil@xxxxxxxxx>]

From: Hans Verkuil <hans.verkuil@xxxxxxxxx>

The priv field should be set to 0. In this case the driver abused the priv
field for internal housekeeping. Modify the code so priv is no longer used
for that purpose.

Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
 drivers/media/usb/stkwebcam/stk-webcam.c |   23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index a654578..d1ef797 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -860,11 +860,12 @@ static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
 		pix_format->bytesperline = 2 * pix_format->width;
 	pix_format->sizeimage = pix_format->bytesperline
 				* pix_format->height;
+	pix_format->priv = 0;
 	return 0;
 }
 
-static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
-		void *priv, struct v4l2_format *fmtd)
+static int stk_try_fmt_vid_cap(struct file *filp,
+		struct v4l2_format *fmtd, int *idx)
 {
 	int i;
 	switch (fmtd->fmt.pix.pixelformat) {
@@ -886,11 +887,13 @@ static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 			< abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
 		fmtd->fmt.pix.height = stk_sizes[i-1].h;
 		fmtd->fmt.pix.width = stk_sizes[i-1].w;
-		fmtd->fmt.pix.priv = i - 1;
+		if (idx)
+			*idx = i - 1;
 	} else {
 		fmtd->fmt.pix.height = stk_sizes[i].h;
 		fmtd->fmt.pix.width = stk_sizes[i].w;
-		fmtd->fmt.pix.priv = i;
+		if (idx)
+			*idx = i;
 	}
 
 	fmtd->fmt.pix.field = V4L2_FIELD_NONE;
@@ -901,9 +904,16 @@ static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 		fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
 	fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
 		* fmtd->fmt.pix.height;
+	fmtd->fmt.pix.priv = 0;
 	return 0;
 }
 
+static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
+		void *priv, struct v4l2_format *fmtd)
+{
+	return stk_try_fmt_vid_cap(filp, fmtd, NULL);
+}
+
 static int stk_setup_format(struct stk_camera *dev)
 {
 	int i = 0;
@@ -944,6 +954,7 @@ static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
 		void *priv, struct v4l2_format *fmtd)
 {
 	int ret;
+	int idx;
 	struct stk_camera *dev = video_drvdata(filp);
 
 	if (dev == NULL)
@@ -954,7 +965,7 @@ static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
 		return -EBUSY;
 	if (dev->owner && dev->owner != filp)
 		return -EBUSY;
-	ret = stk_vidioc_try_fmt_vid_cap(filp, priv, fmtd);
+	ret = stk_try_fmt_vid_cap(filp, fmtd, &idx);
 	if (ret)
 		return ret;
 	dev->owner = filp;
@@ -962,7 +973,7 @@ static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
 	dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
 	stk_free_buffers(dev);
 	dev->frame_size = fmtd->fmt.pix.sizeimage;
-	dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
+	dev->vsettings.mode = stk_sizes[idx].m;
 
 	stk_initialise(dev);
 	return stk_setup_format(dev);
-- 
1.7.10.4

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