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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>
This commit is contained in:
Daniel Mack 2010-02-26 14:36:54 +08:00 committed by Mark Brown
parent bb1c04784d
commit e555317c08
1 changed files with 2 additions and 4 deletions
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6
sound/soc/codecs/ak4104.c
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@ -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;