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Re: [Xen-devel] [PATCH][next] xen/gntdev: remove redundant non-zero check on ret


  • To: Jürgen Groß <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
  • Date: Mon, 11 Nov 2019 12:31:30 +0000
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  • Cc: kernel-janitors@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
  • Delivery-date: Mon, 11 Nov 2019 12:31:38 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 11/11/2019 12:25, Jürgen Groß wrote:
> On 11.11.19 13:20, Colin King wrote:
>> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>>
>> The non-zero check on ret is always going to be false because
>> ret was initialized as zero and the only place it is set to
>> non-zero contains a return path before the non-zero check. Hence
>> the check is redundant and can be removed.
> 
> Which version did you patch against? In current master the above
> statement is not true.

against today's linux-next

Colin
> 
> 
> Juergen
> 
>>
>> Addresses-Coverity: ("Logically dead code")
>> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>> ---
>>   drivers/xen/gntdev.c | 5 -----
>>   1 file changed, 5 deletions(-)
>>
>> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
>> index 10cc5e9e612a..07d80b176118 100644
>> --- a/drivers/xen/gntdev.c
>> +++ b/drivers/xen/gntdev.c
>> @@ -524,11 +524,6 @@ static int gntdev_open(struct inode *inode,
>> struct file *flip)
>>       }
>>   #endif
>>   -    if (ret) {
>> -        kfree(priv);
>> -        return ret;
>> -    }
>> -
>>       flip->private_data = priv;
>>   #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
>>       priv->dma_dev = gntdev_miscdev.this_device;
>>
> 


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