swiotlb: Fix the type of index

Claire Chang · konradwilk · commit 95b079d8215b · 2021-04-27T17:03:20.000Z
Fix the type of index from unsigned int to int since find_slots() might return -1. Fixes: 26a7e09 ("swiotlb: refactor swiotlb_tbl_map_single") Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Claire Chang <tientzu@chromium.org> Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
@@ -499,7 +499,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 {
 	struct io_tlb_mem *mem = io_tlb_default_mem;
 	unsigned int offset = swiotlb_align_offset(dev, orig_addr);
-	unsigned int index, i;
+	unsigned int i;
+	int index;
 	phys_addr_t tlb_addr;
 
 	if (!mem)

Original file line number	Diff line number	Diff line change
`@@ -499,7 +499,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,`
`499`	`499`	`{`
`500`	`500`	`struct io_tlb_mem *mem = io_tlb_default_mem;`
`501`	`501`	`unsigned int offset = swiotlb_align_offset(dev, orig_addr);`
`502`		`- unsigned int index, i;`
	`502`	`+ unsigned int i;`
	`503`	`+ int index;`
`503`	`504`	`phys_addr_t tlb_addr;`
`504`	`505`
`505`	`506`	`if (!mem)`