3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sage Weil <s...@inktank.com>
(cherry picked from commit 8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a)
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 <s...@inktank.com>
Reviewed-by: Alex Elder <el...@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/ceph/messenger.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- 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",
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
