On Fri, Jun 26, 2015 at 11:47 PM, kernel test robot
<fengguang.wu@xxxxxxxxx> wrote:
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> commit b6d1778bc5485c55c6f5194b8b2ea84c0ce5adad
> Author: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> AuthorDate: Thu Feb 26 11:26:34 2015 +0100
> Commit: Vinod Koul <vinod.koul@xxxxxxxxx>
> CommitDate: Mon Mar 2 22:10:44 2015 +0530
>
> dmaengine: shdma: Move DMA stop to (runtime) suspend callbacks
>
> During system reboot, the sh-dma-engine device may be runtime-suspended,
> causing a crash:
>
> Unhandled fault: imprecise external abort (0x1406) at 0x0002c02c
> Internal error: : 1406 [#1] SMP ARM
> ...
> PC is at sh_dmae_ctl_stop+0x28/0x64
> LR is at sh_dmae_ctl_stop+0x24/0x64
>
> If the sh-dma-engine is runtime-suspended, its module clock is turned
> off, and its registers cannot be accessed.
>
> To fix this, move the call to sh_dmae_ctl_stop(), which touches the
> DMAOR register, to the sh_dmae_suspend() and sh_dmae_runtime_suspend()
> callbacks. This makes PM operations more symmetric, as both
> sh_dmae_resume() and sh_dmae_runtime_resume() already call sh_dmae_rst()
> to re-initialize the DMAOR register.
>
> Remove sh_dmae_shutdown(), as it became empty.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
As the crash is on x86_64, and that commit affects sh/arm only, I'm
afraid your crash is due to an intermittent problem.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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