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gpio: pch: 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 10:37:36 +02:00 committed by Linus Walleij
parent c7f5326fb4
commit 09445a103e
1 changed files with 12 additions and 3 deletions
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15
drivers/gpio/gpio-pch.c
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@ -331,14 +331,18 @@ static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
return ret;
}
static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
unsigned int irq_start, unsigned int num)
static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
unsigned int irq_start,
unsigned int num)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base,
handle_simple_irq);
if (!gc)
return -ENOMEM;
gc->private = chip;
ct = gc->chip_types;
@ -349,6 +353,8 @@ static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
return 0;
}
static int pch_gpio_probe(struct pci_dev *pdev,
@ -425,7 +431,10 @@ static int pch_gpio_probe(struct pci_dev *pdev,
goto err_request_irq;
}
pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
ret = pch_gpio_alloc_generic_chip(chip, irq_base,
gpio_pins[chip->ioh]);
if (ret)
goto err_request_irq;
end:
return 0;