linux-kernel - Re: powerpc: Fix crash introduced with commit 5657933dbb6e

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Message-Id: <3vjCc82PtWz9s2G@ozlabs.org>
Date:   Tue, 14 Mar 2017 22:46:00 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "regressions @ leemhuis . info" <regressions@...mhuis.info>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Larry Finger <Larry.Finger@...inger.net>
Subject: Re: powerpc: Fix crash introduced with commit 5657933dbb6e

On Fri, 2017-03-10 at 02:33:51 UTC, Larry Finger wrote:
> Code inserted during the code merged between kernels 4.10 and 4.11-rc1
> caused an early panic quickly followed by a complete shutdown for
> PowerPC. The traceback was not displayed long enough to read or
> photograph, thus it is not reproduced here.
> 
> The problem was bisected to commit 5657933dbb6e ("treewide: Move dma_ops
> from struct dev_archdata into struct device"). The problem was a missing
> copy of critical information from struct dev_archdata into struct device,
> leading to the dereference of a null pointer.
> 
> This fix was suggested by Benjamin Herrenschmidt.
> 
> Fixes: commit 5657933dbb6e ("treewide: Move dma_ops from struct dev_archdata into struct device")
> Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: regressions@...mhuis.info <regressions@...mhuis.info>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/46f401c4297a2232a037ad8801b6c8

cheers