[PATCH 12/13] drm/i2c/tda998x: Fix signed overflow issue

[Daniel Vetter]

This is C standard hair-splitting, but afaict
- sum will be promoted to signed int in computation since
  uint8_t fits
- signed overflow is undefined.

No we need to add up an awful lot of bytes to actually make it
overflow. But I guess the real risk is gcc spotting this and going
bananas. Fix this by simply using unsigned in to force all computations
to use the well-defined unsigned behaviour.

Spotted by coverity.

Cc: Russell King <rmk+kernel at arm.linux.org.uk>
Cc: Rob Clark <robdclark at gmail.com>
Cc: Jean-Francois Moine <moinejf at free.fr>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 48af5cac1902..ae2754760d77 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -568,7 +568,7 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 
 static uint8_t tda998x_cksum(uint8_t *buf, size_t bytes)
 {
-	uint8_t sum = 0;
+	unsigned sum = 0;
 
 	while (bytes--)
 		sum += *buf++;
-- 
1.8.5.2