net: nfs: don't fail when nfs_read_reply returns -NFS_RPC_DROP

That can happen if duplicate UDP packet arrived, and that's not uncommon.
Anyway, we ignore packets with rpc_id lower than last we sent for other
requests, so it makes sense to do that for read request as well.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/net/nfs.c b/net/nfs.c
index 83ed0a7c37c9af87b918f15e018853d70fb63d17..9a16765ba1574fea6f732652aa9d51ad9cf604c1 100644 (file)
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -822,6 +822,8 @@ static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 
        case STATE_READ_REQ:
                rlen = nfs_read_reply(pkt, len);
+               if (rlen == -NFS_RPC_DROP)
+                       break;
                net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
                if (rlen > 0) {
                        nfs_offset += rlen;