linux-kernel - Re: [PATCH] iommu-common: Do not try to deref a null iommu->lazy

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Message-Id: <20150917144126.4038bbec95040fc27ce3db88@linux-foundation.org>
Date:	Thu, 17 Sep 2015 14:41:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	linux@...ck-us.net, davem@...emloft.net
Subject: Re: [PATCH] iommu-common: Do not try to deref a null
 iommu->lazy_flush() pointer when n < pool->hint

On Thu, 17 Sep 2015 17:32:13 -0400 Sowmini Varadhan <sowmini.varadhan@...cle.com> wrote:

> On (09/17/15 14:26), Andrew Morton wrote:
> > Patch looks good.
> > 
> > But I don't know which kernel versions need the fix.  So, when fixing a
> > bug please always describe the end-user visible effects of that bug. 
> > Under what circumstances did your kernel crash?
> > 
> 
> I had a sparc kernel that was crashing when I was trying to process
> some very large perf.data files- the crash happens when the scsi
> driver calls into dma_4v_map_sg and thus the iommu_tbl_range_alloc().

Cool, thanks.

> Do you need me to respin the patch with the above info in the 
> commit id?

No, that's fine.  I updated the changelog, added cc:stable and shall
send it upstream next week.
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