linux-kernel - [PATCH 3.16 095/306] mfd: 88pm80x: Double shifting bug in suspend/resume

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Message-ID: <lsq.1487198500.980532606@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Lee Jones" <lee.jones@...aro.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 095/306] mfd: 88pm80x: Double shifting bug in
 suspend/resume

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 9a6dc644512fd083400a96ac4a035ac154fe6b8d upstream.

set_bit() and clear_bit() take the bit number so this code is really
doing "1 << (1 << irq)" which is a double shift bug.  It's done
consistently so it won't cause a problem unless "irq" is more than 4.

Fixes: 70c6cce04066 ('mfd: Support 88pm80x in 80x driver')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/mfd/88pm80x.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/mfd/88pm80x.h
+++ b/include/linux/mfd/88pm80x.h
@@ -349,7 +349,7 @@ static inline int pm80x_dev_suspend(stru
 	int irq = platform_get_irq(pdev, 0);
 
 	if (device_may_wakeup(dev))
-		set_bit((1 << irq), &chip->wu_flag);
+		set_bit(irq, &chip->wu_flag);
 
 	return 0;
 }
@@ -361,7 +361,7 @@ static inline int pm80x_dev_resume(struc
 	int irq = platform_get_irq(pdev, 0);
 
 	if (device_may_wakeup(dev))
-		clear_bit((1 << irq), &chip->wu_flag);
+		clear_bit(irq, &chip->wu_flag);
 
 	return 0;
 }