Re: [PATCH] iommu-common: Do not try to deref a null iommu->lazy_flush() pointer when n < pool->hint

From	Andrew Morton <akpm@linux-foundation.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] iommu-common: Do not try to deref a null iommu->lazy_flush() pointer when n < pool->hint
Date	2015-09-17 23:50 +0200
Message-ID	<q9Pe1-7Ti-13@gated-at.bofh.it> (permalink)
References	<q9wEq-5yg-7@gated-at.bofh.it> <q9OUG-7wd-13@gated-at.bofh.it> <q9P4m-7Hx-1@gated-at.bofh.it>
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On Thu, 17 Sep 2015 17:32:13 -0400 Sowmini Varadhan <sowmini.varadhan@oracle.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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[PATCH] iommu-common: Do not try to deref a null iommu->lazy_flush()  pointer when n < pool->hint Sowmini Varadhan <sowmini.varadhan@oracle.com> - 2015-09-17 04:00 +0200
  Re: [PATCH] iommu-common: Do not try to deref a null  iommu->lazy_flush() pointer when n < pool->hint Andrew Morton <akpm@linux-foundation.org> - 2015-09-17 23:30 +0200
    Re: [PATCH] iommu-common: Do not try to deref a null  iommu->lazy_flush() pointer when n < pool->hint Sowmini Varadhan <sowmini.varadhan@oracle.com> - 2015-09-17 23:40 +0200
      Re: [PATCH] iommu-common: Do not try to deref a null  iommu->lazy_flush() pointer when n < pool->hint Andrew Morton <akpm@linux-foundation.org> - 2015-09-17 23:50 +0200

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