提交 006f841d 编写于 作者: R Ritesh Harjani 提交者: Marek Szyprowski

arm: dma-iommu: Clean up redundant variable

mapping->size can be derived from mapping->bits << PAGE_SHIFT
which makes mapping->size as redundant.

Clean this up.
Signed-off-by: NRitesh Harjani <ritesh.harjani@gmail.com>
Reported-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
上级 7ee793a6
......@@ -18,7 +18,6 @@ struct dma_iommu_mapping {
unsigned int extensions;
size_t bitmap_size; /* size of a single bitmap */
size_t bits; /* per bitmap */
unsigned int size; /* per bitmap */
dma_addr_t base;
spinlock_t lock;
......
......@@ -1074,6 +1074,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
unsigned int order = get_order(size);
unsigned int align = 0;
unsigned int count, start;
size_t mapping_size = mapping->bits << PAGE_SHIFT;
unsigned long flags;
dma_addr_t iova;
int i;
......@@ -1119,7 +1120,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
}
spin_unlock_irqrestore(&mapping->lock, flags);
iova = mapping->base + (mapping->size * i);
iova = mapping->base + (mapping_size * i);
iova += start << PAGE_SHIFT;
return iova;
......@@ -1129,6 +1130,7 @@ static inline void __free_iova(struct dma_iommu_mapping *mapping,
dma_addr_t addr, size_t size)
{
unsigned int start, count;
size_t mapping_size = mapping->bits << PAGE_SHIFT;
unsigned long flags;
dma_addr_t bitmap_base;
u32 bitmap_index;
......@@ -1136,14 +1138,14 @@ static inline void __free_iova(struct dma_iommu_mapping *mapping,
if (!size)
return;
bitmap_index = (u32) (addr - mapping->base) / (u32) mapping->size;
bitmap_index = (u32) (addr - mapping->base) / (u32) mapping_size;
BUG_ON(addr < mapping->base || bitmap_index > mapping->extensions);
bitmap_base = mapping->base + mapping->size * bitmap_index;
bitmap_base = mapping->base + mapping_size * bitmap_index;
start = (addr - bitmap_base) >> PAGE_SHIFT;
if (addr + size > bitmap_base + mapping->size) {
if (addr + size > bitmap_base + mapping_size) {
/*
* The address range to be freed reaches into the iova
* range of the next bitmap. This should not happen as
......@@ -1964,7 +1966,6 @@ arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size)
mapping->extensions = extensions;
mapping->base = base;
mapping->bits = BITS_PER_BYTE * bitmap_size;
mapping->size = mapping->bits << PAGE_SHIFT;
spin_lock_init(&mapping->lock);
......
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