From: Johan Hovold Date: Mon, 12 Jan 2015 16:12:27 +0000 (+0100) Subject: gpio: fix memory leak and sleep-while-atomic X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=00acc3dc248063f982cfacfbe5e78c0d6797ffef;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git gpio: fix memory leak and sleep-while-atomic 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") Cc: stable Signed-off-by: Johan Hovold Signed-off-by: Linus Walleij --- diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 4efb92ca3463..0f8173051edc 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -327,11 +327,12 @@ void gpiochip_remove(struct gpio_chip *chip) unsigned long flags; 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);