ASoC: fix ak4104 register array access

Don't touch the variable 'reg' to construct the value for the actual SPI
transport. This variable is again used to access the driver's register
cache, and so random memory is overwritten.
Compute the value in-place instead.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: stable@kernel.org
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c
index b9ef7e45891d..b68d99fb6af0 100644
--- a/sound/soc/codecs/ak4104.c
+++ b/sound/soc/codecs/ak4104.c
@@ -90,12 +90,10 @@ static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
         if (reg >= codec->reg_cache_size)
                 return -EINVAL;
 
-        reg &= AK4104_REG_MASK;
-        reg |= AK4104_WRITE;
-
         /* only write to the hardware if value has changed */
         if (cache[reg] != value) {
-                u8 tmp[2] = { reg, value };
+                u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
+
                 if (spi_write(spi, tmp, sizeof(tmp))) {
                         dev_err(&spi->dev, "SPI write failed\n");
                         return -EIO;