Commit d76e8bab authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Linus Walleij
Browse files

gpio: sta2x11: 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: default avatarBartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 09445a10

drivers/gpio/gpio-sta2x11.c

+10 −2
Original line number Diff line number Diff line
@@ -320,13 +320,16 @@ static irqreturn_t gsta_gpio_handler(int irq, void *dev_id) 
	return ret;

}



static void gsta_alloc_irq_chip(struct gsta_gpio *chip)

static int gsta_alloc_irq_chip(struct gsta_gpio *chip)

{

	struct irq_chip_generic *gc;

	struct irq_chip_type *ct;



	gc = irq_alloc_generic_chip(KBUILD_MODNAME, 1, chip->irq_base,

				     chip->reg_base, handle_simple_irq);

	if (!gc)

		return -ENOMEM;



	gc->private = chip;

	ct = gc->chip_types;
@@ -350,6 +353,8 @@ static void gsta_alloc_irq_chip(struct gsta_gpio *chip) 
		}

		gc->irq_cnt = i - gc->irq_base;

	}



	return 0;

}



/* The platform device used here is instantiated by the MFD device */
@@ -400,7 +405,10 @@ static int gsta_probe(struct platform_device *dev) 
		return err;

	}

	chip->irq_base = err;

	gsta_alloc_irq_chip(chip);



	err = gsta_alloc_irq_chip(chip);

	if (err)

		return err;



	err = devm_request_irq(&dev->dev, pdev->irq, gsta_gpio_handler,

			       IRQF_SHARED, KBUILD_MODNAME, chip);