diff options
| author | Keqian Zhu <zhukeqian1@huawei.com> | 2020-12-07 19:57:58 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-12-08 13:56:30 +0000 |
| commit | f12e0d22903e8fb653168efa67ae3308712ea97e (patch) | |
| tree | 5dc3fea8e7fbd6700aaf808f0a85222dd4c9a0b6 /drivers/iommu/io-pgtable-arm.c | |
| parent | 093b32a849b336b5b48bdde1041fc06f91ae475c (diff) | |
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>
Diffstat (limited to 'drivers/iommu/io-pgtable-arm.c')
| -rw-r--r-- | drivers/iommu/io-pgtable-arm.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index a7a9bc08dcd1..8ade72adab31 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -444,10 +444,6 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, arm_lpae_iopte prot; long iaext = (s64)iova >> cfg->ias; - /* If no access, then nothing to do */ - if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) - return 0; - if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return -EINVAL; @@ -456,6 +452,10 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, if (WARN_ON(iaext || paddr >> cfg->oas)) return -ERANGE; + /* If no access, then nothing to do */ + if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) + return 0; + prot = arm_lpae_prot_to_pte(data, iommu_prot); ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep, gfp); /* |