[PATCH] __blk_rq_unmap_user() fails to return error

If the bio is user copied, the copy back could return -EFAULT. Make
sure we return any error seen during unmapping.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 5d472e4..a66ec30 100644 (file)
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -2504,6 +2504,7 @@ EXPORT_SYMBOL(blk_rq_map_user_iov);
 int blk_rq_unmap_user(struct request *rq)
 {
        struct bio *bio, *mapped_bio;
+       int ret = 0, ret2;
 
        while ((bio = rq->bio)) {
                if (bio_flagged(bio, BIO_BOUNCED))
@@ -2511,11 +2512,15 @@ int blk_rq_unmap_user(struct request *rq)
                else
                        mapped_bio = bio;
 
-               __blk_rq_unmap_user(mapped_bio);
+               ret2 = __blk_rq_unmap_user(mapped_bio);
+               if (ret2 && !ret)
+                       ret = ret2;
+
                rq->bio = bio->bi_next;
                bio_put(bio);
        }
-       return 0;
+
+       return ret;
 }
 
 EXPORT_SYMBOL(blk_rq_unmap_user);