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gpio: fix memory leak and sleep-while-atomic

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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 <stable@vger.kernel.org>

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Johan Hovold 2015-01-12 17:12:27 +01:00 committed by Linus Walleij
parent 05aa520334
commit 00acc3dc24
1 changed files with 2 additions and 1 deletions
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3
drivers/gpio/gpiolib.c
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@ -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);