diff options
Diffstat (limited to 'drivers/iommu/io-pgtable-arm.c')
| -rw-r--r-- | drivers/iommu/io-pgtable-arm.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 7df9777..366a354 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -486,11 +486,13 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data, void *cookie = data->iop.cookie; size_t blk_size = ARM_LPAE_BLOCK_SIZE(lvl, data); + /* Something went horribly wrong and we ran out of page table */ + if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS)) + return 0; + ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); pte = *ptep; - - /* Something went horribly wrong and we ran out of page table */ - if (WARN_ON(!pte || (lvl == ARM_LPAE_MAX_LEVELS))) + if (WARN_ON(!pte)) return 0; /* If the size matches this level, we're in the right place */ |