From 95dd1e34ff5bbee93a28ff3947eceaf6de811b1a Mon Sep 17 00:00:00 2001 From: Boerge Struempfel Date: Wed, 29 Nov 2023 16:23:07 +0100 Subject: gpiolib: sysfs: Fix error handling on failed export If gpio_set_transitory() fails, we should free the GPIO again. Most notably, the flag FLAG_REQUESTED has previously been set in gpiod_request_commit(), and should be reset on failure. To my knowledge, this does not affect any current users, since the gpio_set_transitory() mainly returns 0 and -ENOTSUPP, which is converted to 0. However the gpio_set_transitory() function calles the .set_config() function of the corresponding GPIO chip and there are some GPIO drivers in which some (unlikely) branches return other values like -EPROBE_DEFER, and -EINVAL. In these cases, the above mentioned FLAG_REQUESTED would not be reset, which results in the pin being blocked until the next reboot. Fixes: e10f72bf4b3e ("gpio: gpiolib: Generalise state persistence beyond sleep") Signed-off-by: Boerge Struempfel Reviewed-by: Andy Shevchenko Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib-sysfs.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 6f309a3b2d9a..12d853845bb8 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -474,14 +474,17 @@ static ssize_t export_store(const struct class *class, goto done; status = gpiod_set_transitory(desc, false); - if (!status) { - status = gpiod_export(desc, true); - if (status < 0) - gpiod_free(desc); - else - set_bit(FLAG_SYSFS, &desc->flags); + if (status) { + gpiod_free(desc); + goto done; } + status = gpiod_export(desc, true); + if (status < 0) + gpiod_free(desc); + else + set_bit(FLAG_SYSFS, &desc->flags); + done: if (status) pr_debug("%s: status %d\n", __func__, status); -- cgit