Commit 7314ca86 authored Aug 21, 2019 by Will Deacon

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>

parent f75d8e33

drivers/iommu/arm-smmu-v3.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1977,6 +1977,9 @@ static void arm_smmu_tlb_inv_range(unsigned long iova, size_t size,
		},
		};

		if (!size)
		return;

		if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
		cmd.opcode = CMDQ_OP_TLBI_NH_VA;
		cmd.tlbi.asid = smmu_domain->s1_cfg.cd.asid;

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