* [patch] mfd: 88pm80x: Double shifting bug in suspend/resume
@ 2016-08-04 5:26 Dan Carpenter
2016-08-09 13:50 ` Lee Jones
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2016-08-04 5:26 UTC (permalink / raw)
To: Lee Jones, Qiao Zhou; +Cc: linux-kernel, kernel-janitors
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@oracle.com>
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;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [patch] mfd: 88pm80x: Double shifting bug in suspend/resume
2016-08-04 5:26 [patch] mfd: 88pm80x: Double shifting bug in suspend/resume Dan Carpenter
@ 2016-08-09 13:50 ` Lee Jones
0 siblings, 0 replies; 2+ messages in thread
From: Lee Jones @ 2016-08-09 13:50 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Qiao Zhou, linux-kernel, kernel-janitors
On Thu, 04 Aug 2016, Dan Carpenter wrote:
> 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@oracle.com>
Applied, thanks.
> 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;
> }
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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