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Date: Fri, 24 Jan 2020 15:29:07 +0100 From: Joerg Roedel <joro@...tes.org> To: Shuah Khan <skhan@...uxfoundation.org> Cc: suravee.suthikulpanit@....com, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] iommu: amd: Fix IOMMU perf counter clobbering during init On Thu, Jan 23, 2020 at 03:32:14PM -0700, Shuah Khan wrote: > init_iommu_perf_ctr() clobbers the register when it checks write access > to IOMMU perf counters and fails to restore when they are writable. > > Add save and restore to fix it. > > Signed-off-by: Shuah Khan <skhan@...uxfoundation.org> > --- > Changes since v1: > -- Fix bug in sucessful return path. Add a return instead of > fall through to pc_false error case > > drivers/iommu/amd_iommu_init.c | 24 ++++++++++++++++++------ > 1 file changed, 18 insertions(+), 6 deletions(-) Applied for v5.5, thanks.
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