From 7a8f94b0198aa17034da702f020411ad996f63e2 Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Tue, 22 Aug 2017 10:21:20 -0400 Subject: [PATCH] media: em28xx: calculate left volume level correctly commit 801e3659bf2c87c31b7024087d61e89e172b5651 upstream. The calculation of the left volume looks suspect, the value of 0x1f - ((val << 8) & 0x1f) is always 0x1f. The debug prior to the assignment of value[1] prints the left volume setting using the calculation 0x1f - (val >> 8) & 0x1f which looks correct to me. Fix the left volume by using the correct expression as used in the debug. Detected by CoverityScan, CID#146140 ("Wrong operator used") Fixes: 850d24a5a861 ("[media] em28xx-alsa: add mixer support for AC97 volume controls") Signed-off-by: Colin Ian King Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings --- drivers/media/video/em28xx/em28xx-audio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c index cff0768afbf5..e902bf571479 100644 --- a/drivers/media/video/em28xx/em28xx-audio.c +++ b/drivers/media/video/em28xx/em28xx-audio.c @@ -507,7 +507,7 @@ static int em28xx_vol_get(struct snd_kcontrol *kcontrol, val, (int)kcontrol->private_value); value->value.integer.value[0] = 0x1f - (val & 0x1f); - value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); + value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f); return 0; } -- 2.39.2