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authorSage Weil <sage@inktank.com>2012-07-30 18:17:13 -0700
committerSage Weil <sage@inktank.com>2012-07-30 18:17:13 -0700
commit8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a (patch)
tree9fdb08cf293f181c566c830dadccf8d176ef2184 /net
parent7b862e07b1a4d5c963d19027f10ea78085f27f9b (diff)
downloadlinux-8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a.tar.gz
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 <sage@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/messenger.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index feb5a2ac724..c3b628c7619 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",