The system may crash if: - there are more then 1 bank - 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.wall...@linaro.org> Cc: Alexandre Courbot <gnu...@gmail.com> Cc: Sekhar Nori <nsek...@ti.com> Acked-by: Santosh Shilimkar <santosh.shilim...@ti.com> Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com> --- drivers/gpio/gpio-davinci.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index 5d163c0..1b33806 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 -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; + 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; } /* -- 1.7.9.5 _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source