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Message-Id: <1495701458-12444-4-git-send-email-brgl@bgdev.pl>
Date: Thu, 25 May 2017 10:37:38 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH 3/3] gpio: ml-ioh: 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@...ev.pl>
---
drivers/gpio/gpio-ml-ioh.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
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;
--
2.9.3
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