diff options
| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2013-12-18 14:07:51 +0400 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2013-12-25 22:32:12 +0400 |
| commit | 6075a8b2b6c32ddcb99b85189ae41ab2903e560f (patch) | |
| tree | 76b301c58257041ed0b7444965a6c5a26c5792fc /drivers/gpio | |
| parent | 0d978eb7349941139241a99acf05de6dd49b78d1 (diff) | |
| download | linux-6075a8b2b6c32ddcb99b85189ae41ab2903e560f.tar.xz | |
gpio: davinci: don't create irq_domain in case of unbanked irqs
The system may crash if:
- there are more than 1 banks
- unbanked irqs are enabled
- someone will call gpio_to_irq() for GPIO from bank2 or above
Hence, fix it by not creating irq_domain if unbanked irqs are enabled
and correct gpio_to_irq_banked() to handle this properly.
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Sekhar Nori <nsekhar@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-davinci.c | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index 5d163c0d0a74..7629b4f12b7f 100644 --- a/drivers/gpio/gpio-davinci.c +++ b/drivers/gpio/gpio-davinci.c @@ -351,7 +351,10 @@ static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset) { struct davinci_gpio_controller *d = chip2controller(chip); - return irq_create_mapping(d->irq_domain, d->chip.base + offset); + if (d->irq_domain) + return irq_create_mapping(d->irq_domain, d->chip.base + offset); + else + return -ENXIO; } static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset) @@ -429,7 +432,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev) struct davinci_gpio_controller *chips = platform_get_drvdata(pdev); struct davinci_gpio_platform_data *pdata = dev->platform_data; struct davinci_gpio_regs __iomem *g; - struct irq_domain *irq_domain; + struct irq_domain *irq_domain = NULL; ngpio = pdata->ngpio; res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); @@ -453,18 +456,20 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev) } clk_prepare_enable(clk); - irq = irq_alloc_descs(-1, 0, ngpio, 0); - if (irq < 0) { - dev_err(dev, "Couldn't allocate IRQ numbers\n"); - return irq; - } + if (!pdata->gpio_unbanked) { + irq = irq_alloc_descs(-1, 0, ngpio, 0); + if (irq < 0) { + dev_err(dev, "Couldn't allocate IRQ numbers\n"); + return irq; + } - irq_domain = irq_domain_add_legacy(NULL, ngpio, irq, 0, - &davinci_gpio_irq_ops, - chips); - if (!irq_domain) { - dev_err(dev, "Couldn't register an IRQ domain\n"); - return -ENODEV; + irq_domain = irq_domain_add_legacy(NULL, ngpio, irq, 0, + &davinci_gpio_irq_ops, + chips); + if (!irq_domain) { + dev_err(dev, "Couldn't register an IRQ domain\n"); + return -ENODEV; + } } /* @@ -475,8 +480,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev) */ for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) { chips[bank].chip.to_irq = gpio_to_irq_banked; - if (!pdata->gpio_unbanked) - chips[bank].irq_domain = irq_domain; + chips[bank].irq_domain = irq_domain; } /* |