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authorJoseph Qi <joseph.qi@huawei.com>2015-10-22 13:32:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-10-23 17:55:10 +0900
commitb67de018b37a97548645a879c627d4188518e907 (patch)
tree79593d33b91fa8188454d61af8634dbfe35230b3
parentbb387002693ed28b2bb0408c5dec65521b71e5f1 (diff)
ocfs2/dlm: unlock lockres spinlock before dlm_lockres_put
dlm_lockres_put will call dlm_lockres_release if it is the last reference, and then it may call dlm_print_one_lock_resource and take lockres spinlock. So unlock lockres spinlock before dlm_lockres_put to avoid deadlock. Signed-off-by: Joseph Qi <joseph.qi@huawei.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ocfs2/dlm/dlmmaster.c3
-rw-r--r--fs/ocfs2/dlm/dlmrecovery.c2
2 files changed, 3 insertions, 2 deletions
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index ee5aa4daaea0..ce38b4ccc9ab 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -1658,12 +1658,13 @@ send_response:
if (ret < 0) {
mlog(ML_ERROR, "failed to dispatch assert master work\n");
response = DLM_MASTER_RESP_ERROR;
+ spin_unlock(&res->spinlock);
dlm_lockres_put(res);
} else {
dispatched = 1;
__dlm_lockres_grab_inflight_worker(dlm, res);
+ spin_unlock(&res->spinlock);
}
- spin_unlock(&res->spinlock);
} else {
if (res)
dlm_lockres_put(res);
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 3d90ad7ff91f..58eaa5c0d387 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -1723,8 +1723,8 @@ int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
} else {
dispatched = 1;
__dlm_lockres_grab_inflight_worker(dlm, res);
+ spin_unlock(&res->spinlock);
}
- spin_unlock(&res->spinlock);
} else {
/* put.. incase we are not the master */
spin_unlock(&res->spinlock);