From 8d4c277e185c31359cf70573d8b0351fb7dd0dfe Mon Sep 17 00:00:00 2001 From: Jon Hunter Date: Fri, 1 Mar 2013 11:22:48 -0600 Subject: [PATCH] gpio/omap: warn if bank is not enabled on setting irq type For OMAP devices, if a gpio is being used as an interrupt source but has not been requested by calling gpio_request(), a call to request_irq() may cause the kernel hang because the gpio bank may be disabled and hence the register access will fail. To prevent such hangs, test for this case and warn if this is detected. Signed-off-by: Jon Hunter Reviewed-by: Felipe Balbi Acked-by: Santosh Shilimkar Acked-by: Kevin Hilman Tested-by: Javier Martinez Canillas Signed-off-by: Grant Likely --- drivers/gpio/gpio-omap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index c3598d143aa9..0d30c7acf0c7 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -427,6 +427,9 @@ static int gpio_irq_type(struct irq_data *d, unsigned type) int retval; unsigned long flags; + if (WARN_ON(!bank->mod_usage)) + return -EINVAL; + #ifdef CONFIG_ARCH_OMAP1 if (d->irq > IH_MPUIO_BASE) gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE); -- 2.20.1