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iommu: Defer the early return in arm_(v7s/lpae)_map
Although handling a mapping request with no permissions is a trivial no-op, defer the early return until after the size/range checks so that we are consistent with other mapping requests. Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> Link: https://lore.kernel.org/r/20201207115758.9400-1-zhukeqian1@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
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@ -522,14 +522,14 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
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struct io_pgtable *iop = &data->iop;
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int ret;
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/* If no access, then nothing to do */
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if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
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return 0;
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if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
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paddr >= (1ULL << data->iop.cfg.oas)))
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return -ERANGE;
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/* If no access, then nothing to do */
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if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
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return 0;
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ret = __arm_v7s_map(data, iova, paddr, size, prot, 1, data->pgd, gfp);
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/*
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* Synchronise all PTE updates for the new mapping before there's
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@ -444,10 +444,6 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
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arm_lpae_iopte prot;
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long iaext = (s64)iova >> cfg->ias;
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/* If no access, then nothing to do */
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if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
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return 0;
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if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
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return -EINVAL;
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@ -456,6 +452,10 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
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if (WARN_ON(iaext || paddr >> cfg->oas))
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return -ERANGE;
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/* If no access, then nothing to do */
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if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
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return 0;
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prot = arm_lpae_prot_to_pte(data, iommu_prot);
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ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep, gfp);
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/*
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