pinctrl/mediatek: 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:

@@
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: Linus Walleij <linus.walleij@linaro.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Hongzhou Yang <hongzhou.yang@mediatek.com>
Cc: Axel Lin <axel.lin@ingics.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Maoguang Meng <maoguang.meng@mediatek.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: linux-gpio@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 474812e2b0cb97c806402fda486ab2e883398c06..26c42a1e74eda97c989b106e462a51516a381a5b 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -1242,8 +1242,7 @@ int mtk_pctrl_init(struct platform_device *pdev,
                set_irq_flags(virq, IRQF_VALID);
        };
 
-       irq_set_chained_handler(irq, mtk_eint_irq_handler);
-       irq_set_handler_data(irq, pctl);
+       irq_set_chained_handler_and_data(irq, mtk_eint_irq_handler, pctl);
        set_irq_flags(irq, IRQF_VALID);
        return 0;