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authorGrygorii Strashko <grygorii.strashko@ti.com>2013-11-26 23:40:09 +0400
committerSekhar Nori <nsekhar@ti.com>2013-12-25 22:32:11 +0400
commit0d978eb7349941139241a99acf05de6dd49b78d1 (patch)
tree777d7403c8ca1589790c85ff716848ff10404c91 /drivers/gpio/gpio-davinci.c
parentc770844c3e30bed3c269efff1bbb9a14c2318e39 (diff)
downloadlinux-0d978eb7349941139241a99acf05de6dd49b78d1.tar.xz
gpio: davinci: use chained_irq_enter/chained_irq_exit API
It's unsafe to call IRQ chip callbacks (.irq_mask/irq_unmask/irq_ack) from chained IRQ handler directly. Because, Davinci GPIO block is used by different SoCs, which, in turn, have different Main IRQ controllers (Davinci - aintc, cp-intc; Keystone - arm-gic) which may introduce diffrent set of IRQ chip callbacks. As result, call of gpio_irq_handler() on Keysone will simply cause crash the system, because ARM-GIC implements .irq_eoi() instead of .irq_ack(). Hence, fix it by using Kernel chained_irq_enter/chained_irq_exit APIs as they are intended to handle exact such cases. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'drivers/gpio/gpio-davinci.c')
-rw-r--r--drivers/gpio/gpio-davinci.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index 37cf95254df1..5d163c0d0a74 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -22,6 +22,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/platform_data/gpio-davinci.h>
+#include <linux/irqchip/chained_irq.h>
struct davinci_gpio_regs {
u32 dir;
@@ -321,8 +322,7 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc)
mask <<= 16;
/* temporarily mask (level sensitive) parent IRQ */
- desc->irq_data.chip->irq_mask(&desc->irq_data);
- desc->irq_data.chip->irq_ack(&desc->irq_data);
+ chained_irq_enter(irq_desc_get_chip(desc), desc);
while (1) {
u32 status;
int bit;
@@ -343,7 +343,7 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc)
d->chip.base + bit));
}
}
- desc->irq_data.chip->irq_unmask(&desc->irq_data);
+ chained_irq_exit(irq_desc_get_chip(desc), desc);
/* now it may re-trigger */
}