From: Johan Hovold Date: Mon, 12 Jan 2015 16:12:27 +0000 (+0100) Subject: gpio: fix memory leak and sleep-while-atomic X-Git-Tag: v3.16.35~3007 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=cacd4bf52e5932e2f9a80c38f597a7286d87ca4a;p=thirdparty%2Fkernel%2Fstable.git gpio: fix memory leak and sleep-while-atomic commit 00acc3dc248063f982cfacfbe5e78c0d6797ffef upstream. Fix memory leak and sleep-while-atomic in gpiochip_remove. The memory leak was introduced by afa82fab5e13 ("gpio / ACPI: Move event handling registration to gpiolib irqchip helpers") that moved the release of acpi interrupt resources to gpiochip_irqchip_remove, but by then the resources are no longer accessible as the acpi_gpio_chip has already been freed by acpi_gpiochip_remove. Note that this also fixes a few potential sleep-while-atomics, which has been around since 1425052097b5 ("gpio: add IRQ chip helpers in gpiolib") when the call to gpiochip_irqchip_remove while holding a spinlock was added (a couple of irq-domain paths can end up grabbing mutexes). Fixes: afa82fab5e13 ("gpio / ACPI: Move event handling registration to gpiolib irqchip helpers") Fixes: 1425052097b5 ("gpio: add IRQ chip helpers in gpiolib") Signed-off-by: Johan Hovold Signed-off-by: Linus Walleij Signed-off-by: Luis Henriques --- diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index aea93a2f69b48..2c7157705e719 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1272,11 +1272,12 @@ int gpiochip_remove(struct gpio_chip *chip) int status = 0; unsigned id; + gpiochip_irqchip_remove(chip); + acpi_gpiochip_remove(chip); spin_lock_irqsave(&gpio_lock, flags); - gpiochip_irqchip_remove(chip); gpiochip_remove_pin_ranges(chip); of_gpiochip_remove(chip);