tree 5d4d8295400c34caec78e010ff4909431991049a
parent f75d8e33df91ee66fc12820d0da1454b76ebcff9
author Will Deacon <will@kernel.org> 1566387495 +0100
committer Will Deacon <will@kernel.org> 1566406721 +0100

iommu/arm-smmu-v3: Don't issue CMD_SYNC for zero-length invalidations

Calling arm_smmu_tlb_inv_range() with a size of zero, perhaps due to
an empty 'iommu_iotlb_gather' structure, should be a NOP. Elide the
CMD_SYNC when there is no invalidation to be performed.

Signed-off-by: Will Deacon <will@kernel.org>