[PATCH] iov_iter: don't revert if csum error

[Ding Tianhong]

The patch 3278682 (make skb_copy_datagram_msg() et.al. preserve
->msg_iter on error) will revert the iov buffer if copy to iter
failed, but it looks no need to revert for csum error, so fix it.

Fixes: 3278682 ("make skb_copy_datagram_msg() et.al. preserve->msg_iter on 
error")
Signed-off-by: Ding Tianhong <dingtianh...@huawei.com>
---
 net/core/datagram.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/datagram.c b/net/core/datagram.c
index f4947e7..475a8e9 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -760,7 +760,7 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,

        if (msg_data_left(msg) < chunk) {
                if (__skb_checksum_complete(skb))
-                       goto csum_error;
+                       goto fault;
                if (skb_copy_datagram_msg(skb, hlen, msg, chunk))
                        goto fault;
        } else {
-- 
1.8.3.1