iommu/io-pgtable: Use size_t return type for all foo_unmap

Unmap returns a size_t all throughout the IOMMU framework.
Make io-pgtable match this convention.
Moreover, there isn't a need to have a signed int return type
as we return 0 in case of failures.
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/io-pgtable-arm-v7s.c

@@ -357,7 +357,7 @@ static bool arm_v7s_pte_is_cont(arm_v7s_iopte pte, int lvl)
 	return false;
 }
 
-static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *, unsigned long,
+static size_t __arm_v7s_unmap(struct arm_v7s_io_pgtable *, unsigned long,
 			      size_t, int, arm_v7s_iopte *);
 
 static int arm_v7s_init_pte(struct arm_v7s_io_pgtable *data,
@@ -541,9 +541,10 @@ static arm_v7s_iopte arm_v7s_split_cont(struct arm_v7s_io_pgtable *data,
 	return pte;
 }
 
-static int arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
+static size_t arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
 				      unsigned long iova, size_t size,
-				   arm_v7s_iopte blk_pte, arm_v7s_iopte *ptep)
+				      arm_v7s_iopte blk_pte,
+				      arm_v7s_iopte *ptep)
 {
 	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 	arm_v7s_iopte pte, *tablep;
@@ -584,7 +585,7 @@ static int arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
 	return size;
 }
 
-static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
+static size_t __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
 			      unsigned long iova, size_t size, int lvl,
 			      arm_v7s_iopte *ptep)
 {
@@ -656,7 +657,7 @@ static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
 	return __arm_v7s_unmap(data, iova, size, lvl + 1, ptep);
 }
 
-static int arm_v7s_unmap(struct io_pgtable_ops *ops, unsigned long iova,
+static size_t arm_v7s_unmap(struct io_pgtable_ops *ops, unsigned long iova,
 			    size_t size)
 {
 	struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);

drivers/iommu/io-pgtable-arm.c

@@ -268,7 +268,7 @@ static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
 		__arm_lpae_sync_pte(ptep, cfg);
 }
 
-static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
+static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 			       unsigned long iova, size_t size, int lvl,
 			       arm_lpae_iopte *ptep);
 
@@ -506,7 +506,7 @@ static void arm_lpae_free_pgtable(struct io_pgtable *iop)
 	kfree(data);
 }
 
-static int arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
+static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
 				       unsigned long iova, size_t size,
 				       arm_lpae_iopte blk_pte, int lvl,
 				       arm_lpae_iopte *ptep)
@@ -560,7 +560,7 @@ static int arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
 	return size;
 }
 
-static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
+static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 			       unsigned long iova, size_t size, int lvl,
 			       arm_lpae_iopte *ptep)
 {
@@ -606,7 +606,7 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 	return __arm_lpae_unmap(data, iova, size, lvl + 1, ptep);
 }
 
-static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
+static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
 			     size_t size)
 {
 	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);

drivers/iommu/io-pgtable.h

@@ -119,7 +119,7 @@ struct io_pgtable_cfg {
 struct io_pgtable_ops {
 	int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
 		   phys_addr_t paddr, size_t size, int prot);
-	int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
+	size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
 			size_t size);
 	phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
 				    unsigned long iova);