MIPS/ralink: Fix race in installing chained IRQ handler
authorThomas Gleixner <tglx@linutronix.de>
Sun, 21 Jun 2015 19:00:43 +0000 (21:00 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 25 Jun 2015 09:58:01 +0000 (11:58 +0200)
commit5c1642e4d2e475bbfb13da15c6ca16a23ba889bb
treef0d146b47857c6da121efc1a123c9b15a1ecfffd
parent746ad9a7a1fef789a9f579441b4a7b686fa85aa2
MIPS/ralink: 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: Ralf Baechle <ralf@linux-mips.org>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
arch/mips/ralink/irq.c