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

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Message-ID: <20150917213213.GE20745@oracle.com>
Date:	Thu, 17 Sep 2015 17:32:13 -0400
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 (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().

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

--Sowmini
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