[CIFS] fix error in smb_send2

smb_send2 exit logic was strange, and with the previous change
could cause us to fail large
smb writes when all of the smb was not sent as one chunk.
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifssmb.c

@@ -1536,7 +1536,7 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
 	__u32 bytes_sent;
 	__u16 byte_count;
 
-	/* cFYI(1,("write at %lld %d bytes",offset,count));*/
+	/* cFYI(1, ("write at %lld %d bytes", offset, count));*/
 	if (tcon->ses == NULL)
 		return -ECONNABORTED;
 

fs/cifs/transport.c

@@ -290,8 +290,11 @@ smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec,
 		if (rc < 0)
 			break;
 
-		if (rc >= total_len) {
-			WARN_ON(rc > total_len);
+		if (rc == total_len) {
+			total_len = 0;
+			break;
+		} else if (rc > total_len) {
+			cERROR(1, ("sent %d requested %d", rc, total_len));
 			break;
 		}
 		if (rc == 0) {