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

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Date:   Wed, 30 Oct 2019 09:21:41 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     "Andrew F. Davis" <afd@...com>
Cc:     Colin King <colin.king@...onical.com>,
        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 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.

Many thanks to you both!
-john