ASoC: Enforce the mask in snd_soc_update_bits()

Avoids issues if someone does a read followed by restore and doesn't mask
out only the bits being updated.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 13a40fc..c53f5d5 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2323,7 +2323,7 @@ int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned short reg,
                return ret;
 
        old = ret;
-       new = (old & ~mask) | value;
+       new = (old & ~mask) | (value & mask);
        change = old != new;
        if (change) {
                ret = snd_soc_write(codec, reg, new);