From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johan Hovold Subject: [PATCH 4/6] gpio: fix memory leak and sleep-while-atomic Date: Mon, 12 Jan 2015 17:12:27 +0100 Message-ID: <1421079149-2236-5-git-send-email-johan@kernel.org> References: <1421079149-2236-1-git-send-email-johan@kernel.org> Return-path: In-Reply-To: <1421079149-2236-1-git-send-email-johan@kernel.org> Sender: stable-owner@vger.kernel.org To: Linus Walleij Cc: Alexandre Courbot , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable List-Id: linux-gpio@vger.kernel.org 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 --- drivers/gpio/gpiolib.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) 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); -- 2.0.5