From: Sage Weil Date: Tue, 31 Jul 2012 01:16:56 +0000 (-0700) Subject: libceph: verify state after retaking con lock after dispatch X-Git-Tag: v3.4.20~16 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=900fbd910f53a417a6b0859bd2cde7ae48ac4bb2;p=karo-tx-linux.git libceph: verify state after retaking con lock after dispatch (cherry picked from commit 7b862e07b1a4d5c963d19027f10ea78085f27f9b) We drop the con mutex when delivering a message. When we retake the lock, we need to verify we are still in the OPEN state before preparing to read the next tag, or else we risk stepping on a connection that has been closed. Signed-off-by: Sage Weil Reviewed-by: Alex Elder Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 8edc0c14f1c1..bb21e5b0fb55 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2003,7 +2003,6 @@ static void process_message(struct ceph_connection *con) con->ops->dispatch(con, msg); mutex_lock(&con->mutex); - prepare_read_tag(con); } @@ -2213,6 +2212,8 @@ more: if (con->in_tag == CEPH_MSGR_TAG_READY) goto more; process_message(con); + if (con->state == CON_STATE_OPEN) + prepare_read_tag(con); goto more; } if (con->in_tag == CEPH_MSGR_TAG_ACK) {