From: Lu Baolu baolu.lu@linux.intel.com
[ Upstream commit 556f99ac886635e8da15528995f06d1d7028cfca ]
Extend the scope of holding group->mutex so that it can cover the default domain check/attachment and direct mappings of reserved regions.
Cc: Ashish Mhetre amhetre@nvidia.com Fixes: 211ff31b3d33b ("iommu: Fix race condition during default domain allocation") Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Link: https://lore.kernel.org/r/20211108061349.1985579-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3303d707bab4b..f62fb6a58f109 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -287,11 +287,11 @@ int iommu_probe_device(struct device *dev) */ mutex_lock(&group->mutex); iommu_alloc_default_domain(group, dev); - mutex_unlock(&group->mutex);
if (group->default_domain) { ret = __iommu_attach_device(group->default_domain, dev); if (ret) { + mutex_unlock(&group->mutex); iommu_group_put(group); goto err_release; } @@ -299,6 +299,7 @@ int iommu_probe_device(struct device *dev)
iommu_create_device_direct_mappings(group, dev);
+ mutex_unlock(&group->mutex); iommu_group_put(group);
if (ops->probe_finalize)