Re: [PATCH] acpi_system_write_wakeup_device(): fix error check for unsigned variable.

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On 11/22/2012 01:23 AM, Rafael J. Wysocki wrote:
On Thursday, November 22, 2012 01:05:30 AM Cyril Roelandt wrote:
On 11/21/2012 01:44 AM, Rafael J. Wysocki wrote:
On Saturday, November 17, 2012 02:54:23 AM Cyril Roelandt wrote:
The LEN variable is unsigned, therefore checking whether it is less than 0 is
useless.

Signed-off-by: Cyril Roelandt<tipecaml@xxxxxxxxx>
---
   drivers/acpi/proc.c |    2 --
   1 file changed, 2 deletions(-)

diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
index 27adb09..37871a7 100644
--- a/drivers/acpi/proc.c
+++ b/drivers/acpi/proc.c
@@ -366,8 +366,6 @@ acpi_system_write_wakeup_device(struct file *file,

   	if (len>   4)
   		len = 4;
-	if (len<   0)
-		return -EFAULT;

I would prefer to check if count<   0 instead.



count has type size_t, so it is also an unsigned variable. I think that
acpi_system_write_wakeup_device really cannot be called with a "count"
parameter that is less than 0.

OK

So I suppose we can just drop len entirely and replace it with count, right?
[And drop the<  0 check too.]


Indeed, I'll resend.

Cyril Roelandt.
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