linux-kernel - [tip:irq/core] irq: spear-shirq: Fix race in installing chained IRQ handler

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Date:	Thu, 18 Jun 2015 05:08:54 -0700
From:	tip-bot for Russell King <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linus.walleij@...aro.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, thierry.reding@...il.com,
	jason@...edaemon.net, lee.jones@...aro.org,
	rmk+kernel@....linux.org.uk, gnurou@...il.com, hpa@...or.com,
	mingo@...nel.org, ulli.kroll@...glemail.com
Subject: [tip:irq/core] irq: spear-shirq:
  Fix race in installing chained IRQ handler

Commit-ID:  2aedd0fdc69467b1544773acf08333c6f0027e42
Gitweb:     http://git.kernel.org/tip/2aedd0fdc69467b1544773acf08333c6f0027e42
Author:     Russell King <rmk+kernel@....linux.org.uk>
AuthorDate: Tue, 16 Jun 2015 23:07:01 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 18 Jun 2015 14:03:09 +0200

irq: spear-shirq: 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().

Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Cc: Alexandre Courbot <gnurou@...il.com>
Cc: Hans Ulli Kroll <ulli.kroll@...glemail.com>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Thierry Reding <thierry.reding@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/E1Z4z0X-0002T1-6U@rmk-PC.arm.linux.org.uk
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/irqchip/spear-shirq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c
index 9c145a7..a451215 100644
--- a/drivers/irqchip/spear-shirq.c
+++ b/drivers/irqchip/spear-shirq.c
@@ -207,8 +207,7 @@ static void __init spear_shirq_register(struct spear_shirq *shirq,
 	if (!shirq->irq_chip)
 		return;
 
-	irq_set_chained_handler(parent_irq, shirq_handler);
-	irq_set_handler_data(parent_irq, shirq);
+	irq_set_chained_handler_and_data(parent_irq, shirq_handler, shirq);
 
 	for (i = 0; i < shirq->nr_irqs; i++) {
 		irq_set_chip_and_handler(shirq->virq_base + i,
--
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