| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 128/270] libceph: move msgr clear_standby under con mutex protection | Date | Mon, 26 Nov 2012 14:56:58 -0200 |
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3.5.7u1 -stable review patch. If anyone has any objections, please let me know.
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From: Sage Weil <sage@inktank.com>
commit 00650931e52e97fe64096bec167f5a6780dfd94a upstream.
Avoid dropping and retaking con->mutex in the ceph_con_send() case by leaving locking up to the caller.
Signed-off-by: Sage Weil <sage@inktank.com> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- net/ceph/messenger.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 9aaf539..1a3cb4a 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2441,12 +2441,10 @@ static void clear_standby(struct ceph_connection *con) { /* come back from STANDBY? */ if (test_and_clear_bit(STANDBY, &con->state)) { - mutex_lock(&con->mutex); dout("clear_standby %p and ++connect_seq\n", con); con->connect_seq++; WARN_ON(test_bit(WRITE_PENDING, &con->flags)); WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags)); - mutex_unlock(&con->mutex); } } @@ -2483,11 +2481,12 @@ void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) le32_to_cpu(msg->hdr.front_len), le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len)); + + clear_standby(con); mutex_unlock(&con->mutex); /* if there wasn't anything waiting to send before, queue * new work */ - clear_standby(con); if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0) queue_con(con); } @@ -2574,7 +2573,9 @@ void ceph_msg_revoke_incoming(struct ceph_msg *msg) void ceph_con_keepalive(struct ceph_connection *con) { dout("con_keepalive %p\n", con); + mutex_lock(&con->mutex); clear_standby(con); + mutex_unlock(&con->mutex); if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 && test_and_set_bit(WRITE_PENDING, &con->flags) == 0) queue_con(con); -- 1.7.9.5
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