linux-kernel - Re: [PATCH][next] dma-buf: heaps: remove redundant assignment to variable ret

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Message-ID: <93d7256e-daa9-ad1d-3684-7416f65a38dd@canonical.com>
Date:   Thu, 31 Oct 2019 09:34:37 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     John Stultz <john.stultz@...aro.org>,
        "Andrew F. Davis" <afd@...com>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <brian.starkey@....com>,
        linux-media@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>, kernel-janitors@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] dma-buf: heaps: remove redundant assignment to
 variable ret

On 30/10/2019 17:21, John Stultz wrote:
> On Wed, Oct 30, 2019 at 8:45 AM Andrew F. Davis <afd@...com> wrote:
>>
>> On 10/30/19 11:02 AM, Colin King wrote:
>>> From: Colin Ian King <colin.king@...onical.com>
>>>
>>> The variable ret is being assigned with a value that is never
>>> read, it is being re-assigned the same value on the err0 exit
>>> path. The assignment is redundant and hence can be removed.
>>>
>>> Addresses-Coverity: ("Unused value")
>>> Fixes: 47a32f9c1226 ("dma-buf: heaps: Add system heap to dmabuf heaps")
>>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>>> ---
>>
>>
>> The root of the issue is that ret is not used in the error path, it
>> should be, I suggest this fix:
>>
>>> --- a/drivers/dma-buf/heaps/system_heap.c
>>> +++ b/drivers/dma-buf/heaps/system_heap.c
>>> @@ -98,7 +98,7 @@ static int system_heap_allocate(struct dma_heap *heap,
>>>  err0:
>>>         kfree(helper_buffer);
>>>
>>> -       return -ENOMEM;
>>> +       return ret;
>>>  }
> 
> Sounds good! If its ok I'll generate a commit crediting Colin for
> reporting the issue and Andrew for the fix and submit it to Sumit.

Thanks for the correct fix.

Colin

> 
> Many thanks to you both!
> -john
>