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iio: accel: sca3000_core: avoid potentially uninitialized variable

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The newly added __sca3000_get_base_freq function handles all valid
modes of the SCA3000_REG_ADDR_MODE register, but gcc notices
that any other value (i.e. 0x00) causes the base_freq variable to
not get initialized:

drivers/staging/iio/accel/sca3000_core.c: In function 'sca3000_write_raw':
drivers/staging/iio/accel/sca3000_core.c:527:23: error: 'base_freq' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds explicit error handling for unexpected register values,
to ensure this cannot happen.

Fixes: e0f3fc9b47 ("iio: accel: sca3000_core: implemented IIO_CHAN_INFO_SAMP_FREQ")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Ico Doornekamp <ico@pruts.nl>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Arnd Bergmann 2016-10-18 00:13:35 +02:00 committed by Jonathan Cameron
parent d1fe85ec77
commit 64bc2d02d7
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/iio/accel/sca3000_core.c
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@ -468,6 +468,8 @@ static inline int __sca3000_get_base_freq(struct sca3000_state *st,
case SCA3000_MEAS_MODE_OP_2: case SCA3000_MEAS_MODE_OP_2:
*base_freq = info->option_mode_2_freq; *base_freq = info->option_mode_2_freq;
break; break;
default:
ret = -EINVAL;
} }
error_ret: error_ret:
return ret; return ret;