X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=fs%2Fbtrfs%2Fextent_io.c;h=355a973719a02ae1276c842b69e76aeb5965ec46;hb=4125bf761cd0786e1163e024c7c809ce2cc625bc;hp=7073cbb1b2d4cfc169dfea2ca435d353f282250f;hpb=0be2e98173f8badd5ccc7c2e994891746ba1caf4;p=mv-sheeva.git

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7073cbb1b2d..355a973719a 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1750,7 +1750,8 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
 static void end_bio_extent_readpage(struct bio *bio, int err)
 {
 	int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
-	struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
+	struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
+	struct bio_vec *bvec = bio->bi_io_vec;
 	struct extent_io_tree *tree;
 	u64 start;
 	u64 end;
@@ -1773,7 +1774,7 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
 		else
 			whole_page = 0;
 
-		if (--bvec >= bio->bi_io_vec)
+		if (++bvec <= bvec_end)
 			prefetchw(&bvec->bv_page->flags);
 
 		if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) {
@@ -1818,7 +1819,7 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
 			}
 			check_page_locked(tree, page);
 		}
-	} while (bvec >= bio->bi_io_vec);
+	} while (bvec <= bvec_end);
 
 	bio_put(bio);
 }