From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 21 Jun 2015 18:16:21 +0000 (+0200)
Subject: sh/intc: Fix race in installing chained IRQ handler
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=51b971b1b93ab5d1d2e9205c9752c8ffbbcfe303;p=linux-beck.git

sh/intc: 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: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: linux-sh@vger.kernel.org
---

diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c
index 81f22980b2de..156b790072b4 100644
--- a/drivers/sh/intc/core.c
+++ b/drivers/sh/intc/core.c
@@ -366,8 +366,9 @@ int __init register_intc_controller(struct intc_desc *desc)
 
 			/* redirect this interrupts to the first one */
 			irq_set_chip(irq2, &dummy_irq_chip);
-			irq_set_chained_handler(irq2, intc_redirect_irq);
-			irq_set_handler_data(irq2, (void *)irq);
+			irq_set_chained_handler_and_data(irq2,
+							 intc_redirect_irq,
+							 (void *)irq);
 		}
 	}