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pinctrl/samsung: Fix race in installing chained IRQ handler

Browse source 
Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().

Search and conversion was done with coccinelle:

@@
expression E1, E2, E3;
@@
(
-if (irq_set_chained_handler(E1, E3) != 0)
-   BUG();
|
-irq_set_chained_handler(E1, E3);
)
-irq_set_handler_data(E1, E2);
+irq_set_chained_handler_and_data(E1, E3, E2);

@@
expression E1, E2, E3;
@@
(
-if (irq_set_chained_handler(E1, E3) != 0)
-   BUG();
...
|
-irq_set_chained_handler(E1, E3);
...
)
-irq_set_handler_data(E1, E2);
+irq_set_chained_handler_and_data(E1, E3, E2);

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Thomas Abraham <thomas.abraham@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-gpio@vger.kernel.org
This commit is contained in:
Thomas Gleixner 2015-06-21 20:16:18 +02:00
parent 0cfc45cfdf
commit 623a650ebc
1 changed files with 4 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/pinctrl/samsung/pinctrl-s3c64xx.c
View file

@ -506,8 +506,7 @@ static int s3c64xx_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
data->domains[nr_domains++] = bank->irq_domain;
}
irq_set_chained_handler(d->irq, s3c64xx_eint_gpio_irq);
irq_set_handler_data(d->irq, data);
irq_set_chained_handler_and_data(d->irq, s3c64xx_eint_gpio_irq, data);
return 0;
}
@ -731,8 +730,9 @@ static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
return -ENXIO;
}
irq_set_chained_handler(irq, s3c64xx_eint0_handlers[i]);
irq_set_handler_data(irq, data);
irq_set_chained_handler_and_data(irq,
s3c64xx_eint0_handlers[i],
data);
}
bank = d->pin_banks;