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Date: Tue, 8 Aug 2023 10:28:28 +0200
From: Marek BehĂșn <kabel@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
linux-gpio@...r.kernel.org,
Linus Walleij <linus.walleij@...aro.org>
Cc: linux-kernel@...r.kernel.org
Subject: regression from commit b0ce9ce408b6 ("gpiolib: Do not unexport GPIO
on freeing")
Hi,
the commit b0ce9ce408b6 ("gpiolib: Do not unexport GPIO on freeing")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b0ce9ce408b6
causes a regression on my mvebu arm board (haven't tested on other
systems), wherein if I export a GPIO to sysfs and then unexport it, it
does not disasppear from the /sys/class/gpio directory, and subsequent
writes to the export and unexport files for the gpio fail.
$ cd /sys/class/gpio
$ ls
export gpiochip0 gpiochip32 gpiochip512 unexport
$ echo 43 >export
$ ls
export gpio43 gpiochip0 gpiochip32 gpiochip512
unexport
$ cat gpio43/value
1
$ echo 43 >unexport
$ ls
export gpio43 gpiochip0 gpiochip32 gpiochip512
unexport
$ echo 43 >unexport
ash: write error: Invalid argument
$ echo 43 >export
ash: write error: Operation not permitted
Marek
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