smb3: do not display empty interface list

If server does not support listing interfaces then do not
display empty "Server interfaces" line to avoid confusing users.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Aurelien Aptel <aaptel@suse.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index e8db245194e7..bfe999505815 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -333,7 +333,9 @@ skip_rdma:
                         spin_unlock(&GlobalMid_Lock);
 
                         spin_lock(&ses->iface_lock);
-                        seq_printf(m, "\n\tServer interfaces: %zu\n", ses->iface_count);
+                        if (ses->iface_count)
+                                seq_printf(m, "\n\tServer interfaces: %zu\n",
+                                           ses->iface_count);
                         for (j = 0; j < ses->iface_count; j++) {
                                 seq_printf(m, "\t%d)\n", j);
                                 cifs_dump_iface(m, &ses->iface_list[j]);