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-rw-r--r--block/bio.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c
index 14263fab94d3..68bbc835bacc 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1320,6 +1320,7 @@ struct bio *bio_map_user_iov(struct request_queue *q,
offset = uaddr & ~PAGE_MASK;
for (j = cur_page; j < page_limit; j++) {
unsigned int bytes = PAGE_SIZE - offset;
+ unsigned short prev_bi_vcnt = bio->bi_vcnt;
if (len <= 0)
break;
@@ -1334,6 +1335,13 @@ struct bio *bio_map_user_iov(struct request_queue *q,
bytes)
break;
+ /*
+ * check if vector was merged with previous
+ * drop page reference if needed
+ */
+ if (bio->bi_vcnt == prev_bi_vcnt)
+ put_page(pages[j]);
+
len -= bytes;
offset = 0;
}