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gpio: ml-ioh: check the return value of irq_alloc_generic_chip()

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This function can fail, so check the return value before dereferencing
the returned pointer.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2017-05-25 10:37:38 +02:00 committed by Linus Walleij
parent d76e8babe4
commit e3fe07e03e
1 changed files with 13 additions and 3 deletions
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16
drivers/gpio/gpio-ml-ioh.c
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@ -385,14 +385,18 @@ static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
return ret;
}
static void ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
unsigned int irq_start, unsigned int num)
static int ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
unsigned int irq_start,
unsigned int num)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
gc = irq_alloc_generic_chip("ioh_gpio", 1, irq_start, chip->base,
handle_simple_irq);
if (!gc)
return -ENOMEM;
gc->private = chip;
ct = gc->chip_types;
@ -404,6 +408,8 @@ static void ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
return 0;
}
static int ioh_gpio_probe(struct pci_dev *pdev,
@ -468,7 +474,11 @@ static int ioh_gpio_probe(struct pci_dev *pdev,
goto err_gpiochip_add;
}
chip->irq_base = irq_base;
ioh_gpio_alloc_generic_chip(chip, irq_base, num_ports[j]);
ret = ioh_gpio_alloc_generic_chip(chip,
irq_base, num_ports[j]);
if (ret)
goto err_gpiochip_add;
}
chip = chip_save;