diff mbox

[3/3] gpio: ml-ioh: check the return value of irq_alloc_generic_chip()

Message ID 1495701458-12444-4-git-send-email-brgl@bgdev.pl
State New
Headers show

Commit Message

Bartosz Golaszewski May 25, 2017, 8:37 a.m. UTC 
This function can fail, so check the return value before dereferencing
the returned pointer.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
---
 drivers/gpio/gpio-ml-ioh.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

Comments

Linus Walleij May 29, 2017, 11:34 a.m. UTC | #1 
On Thu, May 25, 2017 at 10:37 AM, Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> This function can fail, so check the return value before dereferencing
> the returned pointer.
>
> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

Patch applied.

Yours,
Linus Walleij
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diff mbox

Patch

diff --git a/drivers/gpio/gpio-ml-ioh.c b/drivers/gpio/gpio-ml-ioh.c
index 78896a8..74fdce0 100644
--- a/drivers/gpio/gpio-ml-ioh.c
+++ b/drivers/gpio/gpio-ml-ioh.c
@@ -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;