diff options
| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2015-06-25 20:30:50 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2015-07-16 14:19:22 +0300 |
| commit | 5b76e79c772648991e700f004205e9ac861c77c0 (patch) | |
| tree | 9cea395249c47dc8c1ab15abdb753da07dbf422d /drivers/gpio/gpiolib.c | |
| parent | 049aaf9f7e30731ce030eef3e4fd255cf8b1ae02 (diff) | |
| download | linux-5b76e79c772648991e700f004205e9ac861c77c0.tar.xz | |
gpiolib: irqchip: prevent driver unloading if gpio is used as irq only
Now nothing prevents GPIO driver from being unloaded if its gpios
were requested as GPIO IRQs only (without calling gpio_request()).
Hence, add calls of try_module_get()/module_put() into
gpiochip_irq_reqres/relres() to track such scenario properly.
Cc: Johan Hovold <johan@kernel.org>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index b1b08b3fa626..debd7c56187d 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -522,10 +522,14 @@ static int gpiochip_irq_reqres(struct irq_data *d) { struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + if (!try_module_get(chip->owner)) + return -ENODEV; + if (gpiochip_lock_as_irq(chip, d->hwirq)) { chip_err(chip, "unable to lock HW IRQ %lu for IRQ\n", d->hwirq); + module_put(chip->owner); return -EINVAL; } return 0; @@ -536,6 +540,7 @@ static void gpiochip_irq_relres(struct irq_data *d) struct gpio_chip *chip = irq_data_get_irq_chip_data(d); gpiochip_unlock_as_irq(chip, d->hwirq); + module_put(chip->owner); } static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) |