gpio: pch: check the return value of irq_alloc_generic_chip()
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>
diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
index 71bc6da..f6600f8 100644
--- a/drivers/gpio/gpio-pch.c
+++ b/drivers/gpio/gpio-pch.c
@@ -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;