From: Shyam Prasad N <sprasad@microsoft.com>
Date: Wed, 6 Jul 2022 14:29:12 +0000
Subject: [PATCH] cifs: remove unnecessary locking of chan_lock while freeing
session
Git-commit: 2883f4b5a0e1ac9472c7e3ae9bbdb4ea5a2117c6
References: bsc#1193629
Patch-mainline: v5.19-rc7
In cifs_put_smb_ses, when we're freeing the last ref count to
the session, we need to free up each channel. At this point,
it is unnecessary to take chan_lock, since we have the last
reference to the ses.
Picking up this lock also introduced a deadlock because it calls
cifs_put_tcp_ses, which locks cifs_tcp_ses_lock.
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
fs/cifs/connect.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index fa29c9aae24b..386bb523c69e 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1918,7 +1918,6 @@ void cifs_put_smb_ses(struct cifs_ses *ses)
list_del_init(&ses->smb_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
- spin_lock(&ses->chan_lock);
chan_count = ses->chan_count;
/* close any extra channels */
@@ -1934,7 +1933,6 @@ void cifs_put_smb_ses(struct cifs_ses *ses)
ses->chans[i].server = NULL;
}
}
- spin_unlock(&ses->chan_lock);
sesInfoFree(ses);
cifs_put_tcp_session(server, 0);
--
2.37.3