From: Claire Chang <tientzu@chromium.org>
Date: Thu, 22 Apr 2021 16:14:53 +0800
Subject: swiotlb: Fix the type of index
Git-commit: 95b079d8215b83b37fa59341fda92fcb9392f14a
Patch-mainline: v5.13-rc1
References: git-fixes

Fix the type of index from unsigned int to int since find_slots() might
return -1.

Fixes: 26a7e094783d ("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>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
 kernel/dma/swiotlb.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -564,7 +564,8 @@ phys_addr_t swiotlb_tbl_map_single(struc
 				   enum dma_data_direction dir, unsigned long attrs)
 {
 	unsigned int offset = swiotlb_align_offset(dev, orig_addr);
-	unsigned int index, i;
+	unsigned int i;
+	int index;
 	phys_addr_t tlb_addr;
 
 	if (no_iotlb_memory)