linux-kernel - Re: [PATCH v2 00/21] DRM: fix struct sg_table nents vs. orig

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Date:   Mon, 4 May 2020 15:11:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Christoph Hellwig <hch@....de>, dri-devel@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v2 00/21] DRM: fix struct sg_table nents vs. orig_nents
 misuse

On Mon, May 04, 2020 at 03:05:30PM +0200, Marek Szyprowski wrote:
> Hi Christoph,
> 
> On 04.05.2020 14:52, Christoph Hellwig wrote:
> > On Mon, May 04, 2020 at 02:50:17PM +0200, Marek Szyprowski wrote:
> >> v2:
> >> - dropped most of the changes to drm/i915
> >> - added fixes for rcar-du, xen, media and ion
> >> - fixed a few issues pointed by kbuild test robot
> >> - added wide cc: list for each patch
> > Didn't you plan to add dma_map_sgbuf and co helper?
> 
> Yes, I have a followup patches for that, but I wanted to fix the 
> existing code in the first step. Then I wanted to send a wrappers and 
> their application. Do you think I should do everything at once, in one 
> patchset?

That would be my preference.  The helpers should be mostly trivial
wrappers, so they can easily backported, and they force passing of the
correct parameters.  So I don't really see a need to fix up all the 20+
places up first just to convert them to the proper API a little later.