linux-kernel - [Patch V2 0/2] iommu/arm-smmu: Fix races in iommu domain/group creation

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Date:   Fri, 18 Jun 2021 02:00:35 +0530
From:   Ashish Mhetre <amhetre@...dia.com>
To:     <amhetre@...dia.com>, <robin.murphy@....com>, <will@...nel.org>,
        <vdumpa@...dia.com>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [Patch V2 0/2] iommu/arm-smmu: Fix races in iommu domain/group creation

Multiple iommu domains and iommu groups are getting created for the devices
sharing same SID. It is expected for devices sharing same SID to be in same
iommu group and same iommu domain.
This is leading to context faults when one device is accessing IOVA from
other device which shouldn't be the case for devices sharing same SID.
Fix this by protecting iommu domain and iommu group creation with mutexes.

Ashish Mhetre (1):
  iommu: Fix race condition during default domain allocation

Krishna Reddy (1):
  iommu/arm-smmu: Fix race condition during iommu_group creation

 drivers/iommu/arm/arm-smmu/arm-smmu.c | 6 +++++-
 drivers/iommu/iommu.c                 | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

-- 
2.7.4