ALSA: ASoC: Check for exact register match in wm97xx_reset()

To provide added robustness in case an AC97 controller reads back all
zeros in error cases check for an exact match when testing to see if
resets have brought the codec back.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/soc/codecs/wm9712.c b/sound/soc/codecs/wm9712.c
index 28ac66f6b6b2..47390113bd0e 100644
--- a/sound/soc/codecs/wm9712.c
+++ b/sound/soc/codecs/wm9712.c
@@ -589,12 +589,12 @@ static int wm9712_reset(struct snd_soc_codec *codec, int try_warm)
 {
         if (try_warm && soc_ac97_ops.warm_reset) {
                 soc_ac97_ops.warm_reset(codec->ac97);
-                if (!(ac97_read(codec, 0) & 0x8000))
+                if (ac97_read(codec, 0) == wm9712_reg[0])
                         return 1;
         }
 
         soc_ac97_ops.reset(codec->ac97);
-        if (ac97_read(codec, 0) & 0x8000)
+        if (ac97_read(codec, 0) != wm9712_reg[0])
                 goto err;
         return 0;