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Date:   Sun, 5 Apr 2020 18:40:53 +0200
From:   Greg KH <greg@kroah.com>
To:     Alex Deucher <alexdeucher@gmail.com>
Cc:     Marek Szyprowski <m.szyprowski@samsung.com>,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        linux-samsung-soc@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        David Airlie <airlied@linux.ie>,
        Shane Francis <bigbeeshane@gmail.com>,
        "Michael J . Ruhl" <michael.j.ruhl@intel.com>,
        "for 3.8" <stable@vger.kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Alex Deucher <alexander.deucher@amd.com>
Subject: Re: [PATCH v2] drm/prime: fix extracting of the DMA addresses from a
 scatterlist
Message-ID: <20200405164053.GB1582475@kroah.com>
References: <CGME20200327162330eucas1p1b0413e0e9887aa76d3048f86d2166dcd@eucas1p1.samsung.com>
 <20200327162126.29705-1-m.szyprowski@samsung.com>
 <CADnq5_NpHvmRvzvh1aF293UDUXiHF4Dg1rRNkt7XbM_VB98JCg@mail.gmail.com>
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On Sun, Apr 05, 2020 at 10:47:49AM -0400, Alex Deucher wrote:
> On Fri, Mar 27, 2020 at 12:23 PM Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
> >
> > Scatterlist elements contains both pages and DMA addresses, but one
> > should not assume 1:1 relation between them. The sg->length is the size
> > of the physical memory chunk described by the sg->page, while
> > sg_dma_len(sg) is the size of the DMA (IO virtual) chunk described by
> > the sg_dma_address(sg).
> >
> > The proper way of extracting both: pages and DMA addresses of the whole
> > buffer described by a scatterlist it to iterate independently over the
> > sg->pages/sg->length and sg_dma_address(sg)/sg_dma_len(sg) entries.
> >
> > Fixes: 42e67b479eab ("drm/prime: use dma length macro when mapping sg")
> > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> > Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
> 
> Applied.  Thanks and sorry for the breakage.


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>