[PATCH 5.10 27/80] iio: ad7292: Prevent regulator double disable

Greg Kroah-Hartman
2022-09-06T13:34:23Z

From: Matti Vaittinen <mazziesaccount@gmail.com>

commit 22b4277641c6823ec03d5b1cd82628e5e53e75b7 upstream.

The ad7292 tries to add an devm_action for disabling a regulator at
device detach using devm_add_action_or_reset(). The
devm_add_action_or_reset() does call the release function should adding
action fail. The driver inspects the value returned by
devm_add_action_or_reset() and manually calls regulator_disable() if
adding the action has failed. This leads to double disable and messes
the enable count for regulator.

Do not manually call disable if devm_add_action_or_reset() fails.

Fixes: 506d2e317a0a ("iio: adc: Add driver support for AD7292")
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Tested-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://lore.kernel.org/r/Yv9O+9sxU7gAv3vM@fedora
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iio/adc/ad7292.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/iio/adc/ad7292.c
+++ b/drivers/iio/adc/ad7292.c
@@ -289,10 +289,8 @@ static int ad7292_probe(struct spi_devic

ret = devm_add_action_or_reset(&spi->dev,
ad7292_regulator_disable, st);
- if (ret) {
- regulator_disable(st->reg);
+ if (ret)
return ret;
- }

ret = regulator_get_voltage(st->reg);
if (ret < 0)