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fs: dlm: remove lock dependency warning

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During my experiments to make dlm robust against tcpkill application I
was able to run sometimes in a circular lock dependency warning between
clusters_root.subsys.su_mutex and con->sock_mutex. We don't need to
held the sock_mutex when getting the mark value which held the
clusters_root.subsys.su_mutex. This patch moves the specific handling
just before the sock_mutex will be held.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2020-09-24 10:31:22 -04:00 committed by David Teigland
parent 7ae0451e2e
commit 0461e0db94
1 changed files with 8 additions and 10 deletions
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18
fs/dlm/lowcomms.c
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@ -971,6 +971,10 @@ static void sctp_connect_to_sock(struct connection *con)
return;
}
result = dlm_comm_mark(con->nodeid, &mark);
if (result < 0)
return;
mutex_lock(&con->sock_mutex);
/* Some odd races can cause double-connects, ignore them */
@ -995,11 +999,6 @@ static void sctp_connect_to_sock(struct connection *con)
if (result < 0)
goto socket_err;
/* set skb mark */
result = dlm_comm_mark(con->nodeid, &mark);
if (result < 0)
goto bind_err;
sock_set_mark(sock->sk, mark);
con->rx_action = receive_from_sock;
@ -1072,6 +1071,10 @@ static void tcp_connect_to_sock(struct connection *con)
return;
}
result = dlm_comm_mark(con->nodeid, &mark);
if (result < 0)
return;
mutex_lock(&con->sock_mutex);
if (con->retries++ > MAX_CONNECT_RETRIES)
goto out;
@ -1086,11 +1089,6 @@ static void tcp_connect_to_sock(struct connection *con)
if (result < 0)
goto out_err;
/* set skb mark */
result = dlm_comm_mark(con->nodeid, &mark);
if (result < 0)
goto out_err;
sock_set_mark(sock->sk, mark);
memset(&saddr, 0, sizeof(saddr));