iommu/arm-smmu: hold init_mutex in iommu_domain_get_attr
Some attributes are changed during domain attach and detach, so hold init_mutex to ensure consistency. Change-Id: I450a9a2da4bfe3616ef6dd0a6426271d25c292ce Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org> Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
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