From 8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Mon, 30 Jul 2012 18:17:13 -0700 Subject: [PATCH] libceph: avoid dropping con mutex before fault The ceph_fault() function takes the con mutex, so we should avoid dropping it before calling it. This fixes a potential race with another thread calling ceph_con_close(), or _open(), or similar (we don't reverify con->state after retaking the lock). Add annotation so that lockdep realizes we will drop the mutex before returning. Signed-off-by: Sage Weil Reviewed-by: Alex Elder --- net/ceph/messenger.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index feb5a2ac724c..c3b628c76194 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2336,7 +2336,6 @@ done_unlocked: return; fault: - mutex_unlock(&con->mutex); ceph_fault(con); /* error/fault path */ goto done_unlocked; } @@ -2347,9 +2346,8 @@ fault: * exponential backoff */ static void ceph_fault(struct ceph_connection *con) + __releases(con->mutex) { - mutex_lock(&con->mutex); - pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); dout("fault %p state %lu to peer %s\n",