If reading version and variant from registers fails (which is unlikely but possible, because it is a read over bus), the driver will proceed and perform device configuration based on uninitialized stack variables. Handle it a bit better - bail out without doing any init and failing the update status Soundwire callback.
Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org --- sound/soc/codecs/wsa883x.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/sound/soc/codecs/wsa883x.c b/sound/soc/codecs/wsa883x.c index f5a15f0e891e..60b78560f4b7 100644 --- a/sound/soc/codecs/wsa883x.c +++ b/sound/soc/codecs/wsa883x.c @@ -997,15 +997,19 @@ static const struct reg_sequence reg_init[] = { {WSA883X_GMAMP_SUP1, 0xE2}, };
-static void wsa883x_init(struct wsa883x_priv *wsa883x) +static int wsa883x_init(struct wsa883x_priv *wsa883x) { struct regmap *regmap = wsa883x->regmap; - int variant, version; + int variant, version, ret;
- regmap_read(regmap, WSA883X_OTP_REG_0, &variant); + ret = regmap_read(regmap, WSA883X_OTP_REG_0, &variant); + if (ret) + return ret; wsa883x->variant = variant & WSA883X_ID_MASK;
- regmap_read(regmap, WSA883X_CHIP_ID0, &version); + ret = regmap_read(regmap, WSA883X_CHIP_ID0, &version); + if (ret) + return ret; wsa883x->version = version;
switch (wsa883x->variant) { @@ -1040,6 +1044,8 @@ static void wsa883x_init(struct wsa883x_priv *wsa883x) WSA883X_DRE_OFFSET_MASK, wsa883x->comp_offset); } + + return 0; }
static int wsa883x_update_status(struct sdw_slave *slave, @@ -1048,7 +1054,7 @@ static int wsa883x_update_status(struct sdw_slave *slave, struct wsa883x_priv *wsa883x = dev_get_drvdata(&slave->dev);
if (status == SDW_SLAVE_ATTACHED && slave->dev_num > 0) - wsa883x_init(wsa883x); + return wsa883x_init(wsa883x);
return 0; }