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authorJohan Hovold <johan@kernel.org>2015-04-21 17:42:09 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-17 09:51:32 -0700
commita1f3ecb1f721e5d393f28898350fe3c75fde4c93 (patch)
tree341e53f62c1e75be022ef5d715fc74228d26761e /arch/arm/boot/dts/imx25.dtsi
parent864c329b21a1914105a9e591b49def3f30184b65 (diff)
downloadlinux-linaro-stable-a1f3ecb1f721e5d393f28898350fe3c75fde4c93.tar.gz
gpio: sysfs: fix memory leaks and device hotplug
commit 483d821108791092798f5d230686868112927044 upstream. Unregister GPIOs requested through sysfs at chip remove to avoid leaking the associated memory and sysfs entries. The stale sysfs entries prevented the gpio numbers from being exported when the gpio range was later reused (e.g. at device reconnect). This also fixes the related module-reference leak. Note that kernfs makes sure that any on-going sysfs operations finish before the class devices are unregistered and that further accesses fail. The chip exported flag is used to prevent gpiod exports during removal. This also makes it harder to trigger, but does not fix, the related race between gpiochip_remove and export_store, which is really a race with gpiod_request that needs to be addressed separately. Also note that this would prevent the crashes (e.g. NULL-dereferences) at reconnect that affects pre-3.18 kernels, as well as use-after-free on operations on open attribute files on pre-3.14 kernels (prior to kernfs). Fixes: d8f388d8dc8d ("gpio: sysfs interface") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/boot/dts/imx25.dtsi')
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