Patch "Revert "cifs: reconnect work should have reference on server struct"" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    Revert "cifs: reconnect work should have reference on server struct"

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-cifs-reconnect-work-should-have-reference-on-.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 8ac376c7b23cd48dc254ca7f1710bfb1727c4d53
Author: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Date:   Wed Dec 6 16:37:37 2023 +0000

    Revert "cifs: reconnect work should have reference on server struct"
    
    [ Upstream commit 823342524868168bf681f135d01b4ae10f5863ec ]
    
    This reverts commit 19a4b9d6c372cab6a3b2c9a061a236136fe95274.
    
    This earlier commit was making an assumption that each mod_delayed_work
    called for the reconnect work would result in smb2_reconnect_server
    being called twice. This assumption turns out to be untrue. So reverting
    this change for now.
    
    I will submit a follow-up patch to fix the actual problem in a different
    way.
    
    Signed-off-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
    Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
    Stable-dep-of: 78e727e58e54 ("cifs: update iface_last_update on each query-and-update")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index f43f51f2d1c1..2a30245287d5 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -401,13 +401,7 @@ static int __cifs_reconnect(struct TCP_Server_Info *server,
 			spin_unlock(&server->srv_lock);
 			cifs_swn_reset_server_dstaddr(server);
 			cifs_server_unlock(server);
-
-			/* increase ref count which reconnect work will drop */
-			spin_lock(&cifs_tcp_ses_lock);
-			server->srv_count++;
-			spin_unlock(&cifs_tcp_ses_lock);
-			if (mod_delayed_work(cifsiod_wq, &server->reconnect, 0))
-				cifs_put_tcp_session(server, false);
+			mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 		}
 	} while (server->tcpStatus == CifsNeedReconnect);
 
@@ -537,13 +531,7 @@ static int reconnect_dfs_server(struct TCP_Server_Info *server)
 		spin_unlock(&server->srv_lock);
 		cifs_swn_reset_server_dstaddr(server);
 		cifs_server_unlock(server);
-
-		/* increase ref count which reconnect work will drop */
-		spin_lock(&cifs_tcp_ses_lock);
-		server->srv_count++;
-		spin_unlock(&cifs_tcp_ses_lock);
-		if (mod_delayed_work(cifsiod_wq, &server->reconnect, 0))
-			cifs_put_tcp_session(server, false);
+		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 	} while (server->tcpStatus == CifsNeedReconnect);
 
 	mutex_lock(&server->refpath_lock);
@@ -1630,19 +1618,16 @@ cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
 
 	cancel_delayed_work_sync(&server->echo);
 
-	if (from_reconnect) {
+	if (from_reconnect)
 		/*
 		 * Avoid deadlock here: reconnect work calls
 		 * cifs_put_tcp_session() at its end. Need to be sure
 		 * that reconnect work does nothing with server pointer after
 		 * that step.
 		 */
-		if (cancel_delayed_work(&server->reconnect))
-			cifs_put_tcp_session(server, from_reconnect);
-	} else {
-		if (cancel_delayed_work_sync(&server->reconnect))
-			cifs_put_tcp_session(server, from_reconnect);
-	}
+		cancel_delayed_work(&server->reconnect);
+	else
+		cancel_delayed_work_sync(&server->reconnect);
 
 	spin_lock(&server->srv_lock);
 	server->tcpStatus = CifsExiting;
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index f1977987ae74..da752f41a4e6 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -3981,6 +3981,12 @@ void smb2_reconnect_server(struct work_struct *work)
 		}
 		spin_unlock(&ses->chan_lock);
 	}
+	/*
+	 * Get the reference to server struct to be sure that the last call of
+	 * cifs_put_tcon() in the loop below won't release the server pointer.
+	 */
+	if (tcon_exist || ses_exist)
+		server->srv_count++;
 
 	spin_unlock(&cifs_tcp_ses_lock);
 
@@ -4028,17 +4034,13 @@ void smb2_reconnect_server(struct work_struct *work)
 
 done:
 	cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
-	if (resched) {
+	if (resched)
 		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
-		mutex_unlock(&pserver->reconnect_mutex);
-
-		/* no need to put tcp session as we're retrying */
-		return;
-	}
 	mutex_unlock(&pserver->reconnect_mutex);
 
 	/* now we can safely release srv struct */
-	cifs_put_tcp_session(server, true);
+	if (tcon_exist || ses_exist)
+		cifs_put_tcp_session(server, 1);
 }
 
 int
@@ -4058,12 +4060,7 @@ SMB2_echo(struct TCP_Server_Info *server)
 	    server->ops->need_neg(server)) {
 		spin_unlock(&server->srv_lock);
 		/* No need to send echo on newly established connections */
-		spin_lock(&cifs_tcp_ses_lock);
-		server->srv_count++;
-		spin_unlock(&cifs_tcp_ses_lock);
-		if (mod_delayed_work(cifsiod_wq, &server->reconnect, 0))
-			cifs_put_tcp_session(server, false);
-
+		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 		return rc;
 	}
 	spin_unlock(&server->srv_lock);




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