bttv: norm value should be unsigned

From: Trent Piepho <xyzzy@speakeasy.org>

The norm value in the driver is an index into an array and the the driver
doesn't allow it to be negative or otherwise invalid.  It should be
unsigned but wasn't in all places.

Fix some structs and functions to have the norm be unsigned.  Get rid of
useless checks for "< 0".  Most of the driver code can't handle a norm
value that's out of range, so change some ">= BTTV_TVNORMS" checks to
BUG_ON().  There's no point in silently ignoring invalid driver state just
to crash because of it later.

Priority: normal

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/linux/drivers/media/video/bt8xx/bttvp.h b/linux/drivers/media/video/bt8xx/bttvp.h
index 92961e130..71289d832 100644
--- a/linux/drivers/media/video/bt8xx/bttvp.h
+++ b/linux/drivers/media/video/bt8xx/bttvp.h
@@ -137,7 +137,7 @@ struct bttv_buffer {
 
 	/* bttv specific */
 	const struct bttv_format   *fmt;
-	int                        tvnorm;
+	unsigned int               tvnorm;
 	int                        btformat;
 	int                        btswap;
 	struct bttv_geometry       geo;
@@ -156,7 +156,7 @@ struct bttv_buffer_set {
 };
 
 struct bttv_overlay {
-	int                    tvnorm;
+	unsigned int           tvnorm;
 	struct v4l2_rect       w;
 	enum v4l2_field        field;
 	struct v4l2_clip       *clips;
@@ -176,7 +176,7 @@ struct bttv_vbi_fmt {
 };
 
 /* bttv-vbi.c */
-void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, int norm);
+void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, unsigned int norm);
 
 struct bttv_crop {
 	/* A cropping rectangle in struct bttv_tvnorm.cropcap units. */
@@ -380,7 +380,8 @@ struct bttv {
 	unsigned int audio;
 	unsigned int mute;
 	unsigned long freq;
-	int tvnorm,hue,contrast,bright,saturation;
+	unsigned int tvnorm;
+	int hue, contrast, bright, saturation;
 	struct v4l2_framebuffer fbuf;
 	unsigned int field_count;