This is a note to let you know that I've just added the patch titled cifs: detect dead connections only when echoes are enabled. to the 5.11-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: cifs-detect-dead-connections-only-when-echoes-are-enabled.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From f4916649f98e2c7bdba38c6597a98c456c17317d Mon Sep 17 00:00:00 2001 From: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> Date: Thu, 29 Apr 2021 07:53:18 +0000 Subject: cifs: detect dead connections only when echoes are enabled. From: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> commit f4916649f98e2c7bdba38c6597a98c456c17317d upstream. We can detect server unresponsiveness only if echoes are enabled. Echoes can be disabled under two scenarios: 1. The connection is low on credits, so we've disabled echoes/oplocks. 2. The connection has not seen any request till now (other than negotiate/sess-setup), which is when we enable these two, based on the credits available. So this fix will check for dead connection, only when echo is enabled. Signed-off-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> CC: <stable@xxxxxxxxxxxxxxx> # v5.8+ Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/connect.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -488,6 +488,7 @@ server_unresponsive(struct TCP_Server_In */ if ((server->tcpStatus == CifsGood || server->tcpStatus == CifsNeedNegotiate) && + (!server->ops->can_echo || server->ops->can_echo(server)) && time_after(jiffies, server->lstrp + 3 * server->echo_interval)) { cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n", (3 * server->echo_interval) / HZ); Patches currently in stable-queue which might be from sprasad@xxxxxxxxxxxxx are queue-5.11/cifs-detect-dead-connections-only-when-echoes-are-enabled.patch