From 810871c57011eb3e89e6768932757f169d666cd2 Mon Sep 17 00:00:00 2001 From: Nate Watterson Date: Tue, 20 Dec 2016 23:11:48 -0500 Subject: iommu/arm-smmu-v3: Clear prior settings when updating STEs To prevent corruption of the stage-1 context pointer field when updating STEs, rebuild the entire containing dword instead of clearing individual fields. Signed-off-by: Nate Watterson Signed-off-by: Will Deacon --- drivers/iommu/arm-smmu-v3.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) (limited to 'drivers/iommu/arm-smmu-v3.c') diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 4d6ec444a9d6..94f305db8739 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1042,13 +1042,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid, } } - /* Nuke the existing Config, as we're going to rewrite it */ - val &= ~(STRTAB_STE_0_CFG_MASK << STRTAB_STE_0_CFG_SHIFT); - - if (ste->valid) - val |= STRTAB_STE_0_V; - else - val &= ~STRTAB_STE_0_V; + /* Nuke the existing STE_0 value, as we're going to rewrite it */ + val = ste->valid ? STRTAB_STE_0_V : 0; if (ste->bypass) { val |= disable_bypass ? STRTAB_STE_0_CFG_ABORT @@ -1083,7 +1078,6 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid, val |= (ste->s1_cfg->cdptr_dma & STRTAB_STE_0_S1CTXPTR_MASK << STRTAB_STE_0_S1CTXPTR_SHIFT) | STRTAB_STE_0_CFG_S1_TRANS; - } if (ste->s2_cfg) { -- cgit v1.2.1