From: Fabio Estevam fabio.estevam@freescale.com

According to the sgtl5000 datasheet the valid range for SYS_MCLK is from 8 to 27 MHz.

Add a sanity check prior to enabling SYS_MCLK.

Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- sound/soc/codecs/sgtl5000.c | 9 +++++++++ 1 file changed, 9 insertions(+)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index a604a22..1470437 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -1414,6 +1414,7 @@ static int sgtl5000_i2c_probe(struct i2c_client *client, { struct sgtl5000_priv *sgtl5000; int ret, reg, rev; + unsigned int mclk;

sgtl5000 = devm_kzalloc(&client->dev, sizeof(struct sgtl5000_priv), GFP_KERNEL); @@ -1437,6 +1438,14 @@ static int sgtl5000_i2c_probe(struct i2c_client *client, return ret; }

+ /* SGTL5000 SYS_MCLK should be between 8 and 27 MHz */ + mclk = clk_get_rate(sgtl5000->mclk); + if (mclk < 8000000 || mclk > 27000000) { + dev_err(&client->dev, "Invalid SYS_CLK frequency: %u.%03uMHz\n", + mclk / 1000000, mclk / 1000 % 1000); + return -EINVAL; + } + ret = clk_prepare_enable(sgtl5000->mclk); if (ret) return ret;