linux-kernel - Re: [PATCH] dmaengine: ioatdma: Fix error handling path in 'ioat_dma_self

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Message-ID: <e9bcfe17-ad1c-a658-df8a-e99b5d5dacfb@intel.com>
Date:   Thu, 20 Jul 2017 09:56:45 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     "wharms@....de" <wharms@....de>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "Koul, Vinod" <vinod.koul@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: ioatdma: Fix error handling path in
 'ioat_dma_self_test()'



On 07/20/2017 12:24 AM, walter harms wrote:
> 
> 
> Am 20.07.2017 00:16, schrieb Christophe JAILLET:
>> If the 'memcmp' fails, free allocated resources as done in all other
>> error handling paths.
>>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>> Please review carefully, this patch looks "too obvious" to me!
>> ---
>>  drivers/dma/ioat/init.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
>> index ed8ed1192775..948fc1f8fb5c 100644
>> --- a/drivers/dma/ioat/init.c
>> +++ b/drivers/dma/ioat/init.c
>> @@ -390,7 +390,7 @@ static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
>>  	if (memcmp(src, dest, IOAT_TEST_SIZE)) {
>>  		dev_err(dev, "Self-test copy failed compare, disabling\n");
>>  		err = -ENODEV;
>> -		goto free_resources;
>> +		goto unmap_dma;
>>  	}
>>  
>>  unmap_dma:
> 
> ^^^^^^^^^^
> 
> 
> is the goto needed at all ?

It's not. However, it may be better to stay there if we happen to add
additional code after the if block later on and guard against mistakes.
At least IMO.

> 
> re,
>  wh
>