From 6e933a26e6a2e3d40ed9a269ddb4e0e3ed3ecdb5 Mon Sep 17 00:00:00 2001 From: Matti Vaittinen Date: Fri, 19 Aug 2022 11:51:07 +0300 Subject: [PATCH] iio: ad7292: Prevent regulator double disable 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 Tested-by: Marcelo Schmitt Link: https://lore.kernel.org/r/Yv9O+9sxU7gAv3vM@fedora Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/ad7292.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/iio/adc/ad7292.c b/drivers/iio/adc/ad7292.c index 3271a31..e3e14a1 100644 --- a/drivers/iio/adc/ad7292.c +++ b/drivers/iio/adc/ad7292.c @@ -287,10 +287,8 @@ static int ad7292_probe(struct spi_device *spi) 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) -- 2.7.4