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iommu: Do not return error code for APIs with size_t return type

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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>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Suravee Suthikulpanit 2018-02-05 05:45:53 -05:00 committed by Joerg Roedel
parent 7928b2cbe5
commit c5611a8751
3 changed files with 11 additions and 11 deletions
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2
drivers/iommu/amd_iommu.c
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@ -3050,7 +3050,7 @@ 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);

6
drivers/iommu/iommu.c
View File

@ -1573,10 +1573,10 @@ 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);
@ -1589,7 +1589,7 @@ 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);

14
include/linux/iommu.h
View File

@ -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)