diff options
| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2013-11-26 21:40:09 +0200 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2013-12-26 00:02:11 +0530 |
| commit | 0d978eb7349941139241a99acf05de6dd49b78d1 (patch) | |
| tree | 777d7403c8ca1589790c85ff716848ff10404c91 /drivers/gpio | |
| parent | c770844c3e30bed3c269efff1bbb9a14c2318e39 (diff) | |
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')
| -rw-r--r-- | drivers/gpio/gpio-davinci.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index 37cf95254df..5d163c0d0a7 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 */ } |