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Subject[PATCH] iommu: Do not return error code for APIs with size_t return type
Date
Currently, iommu_unmap, iommu_unmap_fast and iommu_map_sg return
size_t. However, some of the return values are error codes (< 0),
which can be misinterpreted as large size. Therefore, returning size 0
instead to signify failure to map/unmap.

Cc: Joerg Roedel <joro@8bytes.org>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---

Note: This issue was previously discussed here (https://lkml.org/lkml/2018/1/30/873).

drivers/iommu/amd_iommu.c | 2 +-
drivers/iommu/iommu.c | 6 +++---
include/linux/iommu.h | 14 +++++++-------
3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 7d5eb00..fed8059 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3037,7 +3037,7 @@ static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
size_t unmap_size;

if (domain->mode == PAGE_MODE_NONE)
- return -EINVAL;
+ return 0;

mutex_lock(&domain->api_lock);
unmap_size = iommu_unmap_page(domain, iova, page_size);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3de5c0b..dcd55fd 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1568,10 +1568,10 @@ static size_t __iommu_unmap(struct iommu_domain *domain,

if (unlikely(ops->unmap == NULL ||
domain->pgsize_bitmap == 0UL))
- return -ENODEV;
+ return 0;

if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
- return -EINVAL;
+ return 0;

/* find out the minimum page size supported */
min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
@@ -1584,7 +1584,7 @@ static size_t __iommu_unmap(struct iommu_domain *domain,
if (!IS_ALIGNED(iova | size, min_pagesz)) {
pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
iova, size, min_pagesz);
- return -EINVAL;
+ return 0;
}

pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 41b8c57..19938ee 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -465,23 +465,23 @@ static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
return -ENODEV;
}

-static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static inline size_t iommu_unmap(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
- return -ENODEV;
+ return 0;
}

-static inline int iommu_unmap_fast(struct iommu_domain *domain, unsigned long iova,
- int gfp_order)
+static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
+ unsigned long iova, int gfp_order)
{
- return -ENODEV;
+ return 0;
}

static inline size_t iommu_map_sg(struct iommu_domain *domain,
unsigned long iova, struct scatterlist *sg,
unsigned int nents, int prot)
{
- return -ENODEV;
+ return 0;
}

static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
--
1.8.3.1
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