linux-kernel - Re: [PATCH] staging: media: hantro: Remove call to memset after dma_alloc

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Date:   Mon, 19 Aug 2019 13:17:04 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Hariprasad Kelam <hariprasad.kelam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        ZhiChao Yu <zhichao.yu@...k-chips.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Boris Brezillon <boris.brezillon@...labora.com>
Subject: Re: [PATCH] staging: media: hantro: Remove call to memset after dma_alloc_coherent

Hi Hans,

On Thu, Jul 25, 2019 at 8:50 PM Boris Brezillon
<boris.brezillon@...labora.com> wrote:
>
> On Thu, 25 Jul 2019 08:36:02 +0530
> Hariprasad Kelam <hariprasad.kelam@...il.com> wrote:
>
> > fix below issue reported by coccicheck
> > /drivers/staging/media/hantro/hantro_vp8.c:149:16-34: WARNING:
> > dma_alloc_coherent use in aux_buf -> cpu already zeroes out memory,  so
> > memset is not needed
> >
> > Signed-off-by: Hariprasad Kelam <hariprasad.kelam@...il.com>
>
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
>
> > ---
> >  drivers/staging/media/hantro/hantro_vp8.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/staging/media/hantro/hantro_vp8.c b/drivers/staging/media/hantro/hantro_vp8.c
> > index 66c4533..363ddda 100644
> > --- a/drivers/staging/media/hantro/hantro_vp8.c
> > +++ b/drivers/staging/media/hantro/hantro_vp8.c
> > @@ -151,8 +151,6 @@ int hantro_vp8_dec_init(struct hantro_ctx *ctx)
> >       if (!aux_buf->cpu)
> >               return -ENOMEM;
> >
> > -     memset(aux_buf->cpu, 0, aux_buf->size);
> > -
> >       /*
> >        * Allocate probability table buffer,
> >        * total 1208 bytes, 4K page is far enough.
>

Is this something you will pick to your tree?

Best regards,
Tomasz