DLM: Replace nodeid_to_addr with kernel_getpeername

This patch replaces the call to nodeid_to_addr with a call to
kernel_getpeername. This avoids taking a spinlock because it may
potentially be called from a softirq context.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lowcomms.c

@@ -469,8 +469,10 @@ static void lowcomms_error_report(struct sock *sk)
 {
 	struct connection *con = sock2con(sk);
 	struct sockaddr_storage saddr;
+	int buflen;
 
-	if (nodeid_to_addr(con->nodeid, &saddr, NULL, false)) {
+	if (con->sock == NULL ||
+	    kernel_getpeername(con->sock, (struct sockaddr *)&saddr, &buflen)) {
 		printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
 				   "sending to node %d, port %d, "
 				   "sk_err=%d/%d\n", dlm_our_nodeid(),