[patch] mfd: 88pm80x: Double shifting bug in suspend/resume

From: Dan Carpenter
Date: Thu Aug 04 2016 - 01:28:17 EST


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@xxxxxxxxxx>

diff --git a/include/linux/mfd/88pm80x.h b/include/linux/mfd/88pm80x.h
index d409ceb..c118a7e 100644
--- a/include/linux/mfd/88pm80x.h
+++ b/include/linux/mfd/88pm80x.h
@@ -350,7 +350,7 @@ static inline int pm80x_dev_suspend(struct device *dev)
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;
}
@@ -362,7 +362,7 @@ static inline int pm80x_dev_resume(struct device *dev)
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;
}