From 2b1f28ee49dad6d45bb7d8ab4b492570f7aeaa77 Mon Sep 17 00:00:00 2001 From: Shyam Prasad N Date: Thu, 1 Feb 2024 11:15:28 +0000 Subject: [PATCH] cifs: do not search for channel if server is terminating [ Upstream commit 88675b22d34e6e815ad4bde09c590ccb2d50c59d ] In order to scale down the channels, the following sequence of operations happen: 1. server struct is marked for terminate 2. the channel is deallocated in the ses->chans array 3. at a later point the cifsd thread actually terminates the server Between 2 and 3, there can be calls to find the channel for a server struct. When that happens, there can be an ugly warning that's logged. But this is expected. So this change does two things: 1. in cifs_ses_get_chan_index, if server->terminate is set, return 2. always make sure server->terminate is set with chan_lock held Signed-off-by: Shyam Prasad N Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/smb/client/sess.c | 4 ++++ fs/smb/client/smb2pdu.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/smb/client/sess.c b/fs/smb/client/sess.c index a20a5d0836dc..52f7a411e2bb 100644 --- a/fs/smb/client/sess.c +++ b/fs/smb/client/sess.c @@ -75,6 +75,10 @@ cifs_ses_get_chan_index(struct cifs_ses *ses, { unsigned int i; + /* if the channel is waiting for termination */ + if (server->terminate) + return CIFS_INVAL_CHAN_INDEX; + for (i = 0; i < ses->chan_count; i++) { if (ses->chans[i].server == server) return i; diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index ce2d28537bc8..97fc2f85b429 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -178,6 +178,7 @@ cifs_chan_skip_or_disable(struct cifs_ses *ses, } ses->chans[chan_index].server = NULL; + server->terminate = true; spin_unlock(&ses->chan_lock); /* @@ -188,7 +189,6 @@ cifs_chan_skip_or_disable(struct cifs_ses *ses, */ cifs_put_tcp_session(server, from_reconnect); - server->terminate = true; cifs_signal_cifsd_for_reconnect(server, false); /* mark primary server as needing reconnect */