cifs: dump channel info in DebugData

* show server&TCP states for extra channels
* mention if an interface has a channel connected to it

In this version three of the patch, fixed minor printk format
issue pointed out by the kbuild robot.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifs_debug.c

@@ -121,6 +121,27 @@ static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
 	seq_putc(m, '\n');
 }
 
+static void
+cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
+{
+	struct TCP_Server_Info *server = chan->server;
+
+	seq_printf(m, "\t\tChannel %d Number of credits: %d Dialect 0x%x "
+		   "TCP status: %d Instance: %d Local Users To Server: %d "
+		   "SecMode: 0x%x Req On Wire: %d In Send: %d "
+		   "In MaxReq Wait: %d\n",
+		   i+1,
+		   server->credits,
+		   server->dialect,
+		   server->tcpStatus,
+		   server->reconnect_instance,
+		   server->srv_count,
+		   server->sec_mode,
+		   in_flight(server),
+		   atomic_read(&server->in_send),
+		   atomic_read(&server->num_waiters));
+}
+
 static void
 cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
 {
@@ -376,6 +397,13 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 			if (ses->sign)
 				seq_puts(m, " signed");
 
+			if (ses->chan_count > 1) {
+				seq_printf(m, "\n\n\tExtra Channels: %zu\n",
+					   ses->chan_count-1);
+				for (j = 1; j < ses->chan_count; j++)
+					cifs_dump_channel(m, j, &ses->chans[j]);
+			}
+
 			seq_puts(m, "\n\tShares:");
 			j = 0;
 
@@ -414,8 +442,13 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 				seq_printf(m, "\n\tServer interfaces: %zu\n",
 					   ses->iface_count);
 			for (j = 0; j < ses->iface_count; j++) {
+				struct cifs_server_iface *iface;
+
+				iface = &ses->iface_list[j];
 				seq_printf(m, "\t%d)", j);
-				cifs_dump_iface(m, &ses->iface_list[j]);
+				cifs_dump_iface(m, iface);
+				if (is_ses_using_iface(ses, iface))
+					seq_puts(m, "\t\t[CONNECTED]\n");
 			}
 			spin_unlock(&ses->iface_lock);
 		}