From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 21 Jun 2015 18:16:15 +0000 (+0200)
Subject: pinctrl/st: Fix race in installing chained IRQ handler
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1b11b0cb799e5f82ca6391a23eaa8f41c7466cc0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

pinctrl/st: 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: Srinivas Kandagatla <srinivas.kandagatla@gmail.com>
Cc: Maxime Coquelin <maxime.coquelin@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kernel@stlinux.com
Cc: linux-gpio@vger.kernel.org
---

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 65bf73b70e34..10e9c4e8e816 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -1661,8 +1661,8 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
 		if (IS_ERR(info->irqmux_base))
 			return PTR_ERR(info->irqmux_base);
 
-		irq_set_chained_handler(irq, st_gpio_irqmux_handler);
-		irq_set_handler_data(irq, info);
+		irq_set_chained_handler_and_data(irq, st_gpio_irqmux_handler,
+						 info);
 
 	}