[PATCH V3] fs/ceph:fix double unlock in handle_cap_export()
From: Wu Bo
Date: Thu Apr 30 2020 - 02:14:00 EST
If the ceph_mdsc_open_export_target_session() return fails,
we should add mutex_lock(&session->s_mutex) on IS_ERR(tsession) block
to avoid twice unlocking. because the session->s_mutex will be unlock
at the out_unlock lable.
--
v2 -> v3:
- Rewrite solution, adding a mutex_lock(&session->s_mutex)
to the IS_ERR(tsession) block.
- Modify the comment more clearly.
v1 -> v2:
- add spin_lock(&ci->i_ceph_lock) before goto out_unlock lable
Signed-off-by: Wu Bo <wubo40@xxxxxxxxxx>
---
fs/ceph/caps.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 185db76..d27d778 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3746,6 +3746,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
WARN_ON(1);
tsession = NULL;
target = -1;
+ mutex_lock(&session->s_mutex);
}
goto retry;
--
1.8.3.1