gpio/davinci: Fix race in installing chained irq handler

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.

Reported-by: Russell King <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Julia Lawall <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Alexandre Courbot <[email protected]>

diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index c5e05c82d67c6c2cd8fdeac5996413e99455a3d1..c246ac3dda7ca2ba0cfa443b8e0175dc176d8da9 100644 (file)
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -578,15 +578,13 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
                writel_relaxed(~0, &g->clr_falling);
                writel_relaxed(~0, &g->clr_rising);
 
-               /* set up all irqs in this bank */
-               irq_set_chained_handler(bank_irq, gpio_irq_handler);
-
                /*
                 * Each chip handles 32 gpios, and each irq bank consists of 16
                 * gpio irqs. Pass the irq bank's corresponding controller to
                 * the chained irq handler.
                 */
-               irq_set_handler_data(bank_irq, &chips[gpio / 32]);
+               irq_set_chained_handler_and_data(bank_irq, gpio_irq_handler,
+                                                &chips[gpio / 32]);
 
                binten |= BIT(bank);
        }