[PATCH v2 03/21] iommu: Return full error code from iommu_map_sg[_atomic]()

[Logan Gunthorpe <logang@xxxxxxxxxxxx>]

Convert to ssize_t return code so the return code from __iommu_map()
can be returned all the way down through dma_iommu_map_sg().

Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
---
 drivers/iommu/iommu.c | 15 +++++++--------
 include/linux/iommu.h | 22 +++++++++++-----------
 2 files changed, 18 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5419c4b9f27a..bf971b4e34aa 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2567,9 +2567,9 @@ size_t iommu_unmap_fast(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_unmap_fast);
 
-static size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-                            struct scatterlist *sg, unsigned int nents, int 
prot,
-                            gfp_t gfp)
+static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+               struct scatterlist *sg, unsigned int nents, int prot,
+               gfp_t gfp)
 {
        const struct iommu_ops *ops = domain->ops;
        size_t len = 0, mapped = 0;
@@ -2610,19 +2610,18 @@ static size_t __iommu_map_sg(struct iommu_domain 
*domain, unsigned long iova,
        /* undo mappings already done */
        iommu_unmap(domain, iova, mapped);
 
-       return 0;
-
+       return ret;
 }
 
-size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-                   struct scatterlist *sg, unsigned int nents, int prot)
+ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+                    struct scatterlist *sg, unsigned int nents, int prot)
 {
        might_sleep();
        return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL);
 }
 EXPORT_SYMBOL_GPL(iommu_map_sg);
 
-size_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova,
+ssize_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova,
                    struct scatterlist *sg, unsigned int nents, int prot)
 {
        return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 32d448050bf7..9369458ba1bd 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -414,11 +414,11 @@ extern size_t iommu_unmap(struct iommu_domain *domain, 
unsigned long iova,
 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
                               unsigned long iova, size_t size,
                               struct iommu_iotlb_gather *iotlb_gather);
-extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-                          struct scatterlist *sg,unsigned int nents, int prot);
-extern size_t iommu_map_sg_atomic(struct iommu_domain *domain,
-                                 unsigned long iova, struct scatterlist *sg,
-                                 unsigned int nents, int prot);
+extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+               struct scatterlist *sg, unsigned int nents, int prot);
+extern ssize_t iommu_map_sg_atomic(struct iommu_domain *domain,
+                                  unsigned long iova, struct scatterlist *sg,
+                                  unsigned int nents, int prot);
 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t 
iova);
 extern void iommu_set_fault_handler(struct iommu_domain *domain,
                        iommu_fault_handler_t handler, void *token);
@@ -679,18 +679,18 @@ static inline size_t iommu_unmap_fast(struct iommu_domain 
*domain,
        return 0;
 }
 
-static inline size_t iommu_map_sg(struct iommu_domain *domain,
-                                 unsigned long iova, struct scatterlist *sg,
-                                 unsigned int nents, int prot)
+static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
+                                  unsigned long iova, struct scatterlist *sg,
+                                  unsigned int nents, int prot)
 {
-       return 0;
+       return -ENODEV;
 }
 
-static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain,
+static inline ssize_t iommu_map_sg_atomic(struct iommu_domain *domain,
                                  unsigned long iova, struct scatterlist *sg,
                                  unsigned int nents, int prot)
 {
-       return 0;
+       return -ENODEV;
 }
 
 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
-- 
2.20.1