linux-kernel - Re: [PATCH] sh: mm: Fix unprotected access to struct device

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Date:   Fri, 20 Apr 2018 01:31:47 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     jacopo mondi <jacopo@...ndi.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        ysato@...rs.sourceforge.jp, dalias@...c.org,
        thomas.petazzoni@...e-electrons.com, robin.murphy@....com,
        geert@...ux-m68k.org, linux-renesas-soc@...r.kernel.org,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: mm: Fix unprotected access to struct device

On Wed, Apr 18, 2018 at 03:13:14PM +0200, jacopo mondi wrote:
> As long as it goes for arch/sh, the only user of dma_alloc_coherent()
> is platform_resource_setup_memory(), and it has been fixed by this
> patch.

Great!

> 
> Unfortunately, as Thomas pointed out, there are drivers which calls
> into this with the wrong 'struct device' as the sh_eth one he had fixed.

Yes, we'll need fixes there.  Other DMA ops implementations also look
at struct device, so they generally are buggy.

> I would then say that as long as it goes for the NULL case, we should be
> fine now.

Then I'd say skil that part, please.