From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 13 Jul 2015 21:22:44 +0000 (+0200)
Subject: gpio/davinci: Fix race in installing chained irq handler
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bdac2b6dc7392668a8530d67a5f762366f57f9b4;p=linux-beck.git

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 <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: Alexandre Courbot <gnurou@gmail.com>
---

diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index d885d98fe161..b23cbcea2d98 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -579,15 +579,13 @@ 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);
 	}