From: Jonathan Cameron Jonathan.Cameron@huawei.com
commit 4573472315f0fa461330545ff2aa2f6da0b1ae76 upstream.
If the devm_regulator_get() call succeeded but not the regulator_enable() then regulator_disable() would be called on a regulator that was not enabled.
Fix this by moving regulator enabling / disabling over to devm_ management via devm_add_action_or_reset.
Alexandru's sign-off here because he pulled Jonathan's patch into a larger set which Jonathan then applied.
Fixes: b3af341bbd96 ("iio: adc: Add ad7124 support") Reviewed-by: Alexandru Ardelean ardeleanalex@gmail.com Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Alexandru Ardelean aardelean@deviqon.com Cc: Stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/ad7124.c | 29 +++++++++++++---------------- 1 file changed, 13 insertions(+), 16 deletions(-)
--- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -564,6 +564,11 @@ static int ad7124_setup(struct ad7124_st return ret; }
+static void ad7124_reg_disable(void *r) +{ + regulator_disable(r); +} + static int ad7124_probe(struct spi_device *spi) { const struct spi_device_id *id; @@ -607,17 +612,20 @@ static int ad7124_probe(struct spi_devic ret = regulator_enable(st->vref[i]); if (ret) return ret; + + ret = devm_add_action_or_reset(&spi->dev, ad7124_reg_disable, + st->vref[i]); + if (ret) + return ret; }
st->mclk = devm_clk_get(&spi->dev, "mclk"); - if (IS_ERR(st->mclk)) { - ret = PTR_ERR(st->mclk); - goto error_regulator_disable; - } + if (IS_ERR(st->mclk)) + return PTR_ERR(st->mclk);
ret = clk_prepare_enable(st->mclk); if (ret < 0) - goto error_regulator_disable; + return ret;
ret = ad7124_soft_reset(st); if (ret < 0) @@ -643,11 +651,6 @@ error_remove_trigger: ad_sd_cleanup_buffer_and_trigger(indio_dev); error_clk_disable_unprepare: clk_disable_unprepare(st->mclk); -error_regulator_disable: - for (i = ARRAY_SIZE(st->vref) - 1; i >= 0; i--) { - if (!IS_ERR_OR_NULL(st->vref[i])) - regulator_disable(st->vref[i]); - }
return ret; } @@ -656,17 +659,11 @@ static int ad7124_remove(struct spi_devi { struct iio_dev *indio_dev = spi_get_drvdata(spi); struct ad7124_state *st = iio_priv(indio_dev); - int i;
iio_device_unregister(indio_dev); ad_sd_cleanup_buffer_and_trigger(indio_dev); clk_disable_unprepare(st->mclk);
- for (i = ARRAY_SIZE(st->vref) - 1; i >= 0; i--) { - if (!IS_ERR_OR_NULL(st->vref[i])) - regulator_disable(st->vref[i]); - } - return 0; }