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cifs: add missing spinlock around tcon refcount

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Add missing spinlock to protect updates on tcon refcount in
cifs_put_tcon().

Fixes: d7d7a66aac ("cifs: avoid use of global locks for high contention data")
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2022-09-13 21:34:51 -07:00 committed by Steve French
parent bedc8f76b3
commit 621a41ae08
1 changed files with 3 additions and 0 deletions
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3
fs/cifs/connect.c
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@ -2345,7 +2345,9 @@ cifs_put_tcon(struct cifs_tcon *tcon)
ses = tcon->ses;
cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
spin_lock(&cifs_tcp_ses_lock);
spin_lock(&tcon->tc_lock);
if (--tcon->tc_count > 0) {
spin_unlock(&tcon->tc_lock);
spin_unlock(&cifs_tcp_ses_lock);
return;
}
@ -2354,6 +2356,7 @@ cifs_put_tcon(struct cifs_tcon *tcon)
WARN_ON(tcon->tc_count < 0);
list_del_init(&tcon->tcon_list);
spin_unlock(&tcon->tc_lock);
spin_unlock(&cifs_tcp_ses_lock);
/* cancel polling of interfaces */