staging: lustre: lmv: release locks if lmv_intent_lock() fails

In lmv_intent_lock() if we will return an error then first release any
locks referenced by the intent.
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5431
Reviewed-on: http://review.whamcloud.com/11319Reviewed-by: wang di <di.wang@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/lmv/lmv_intent.c

@@ -533,5 +533,27 @@ int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 				     extra_lock_flags);
 	else
 		LBUG();
+
+	if (rc < 0) {
+		struct lustre_handle lock_handle;
+
+		if (it->it_lock_mode) {
+			lock_handle.cookie = it->it_lock_handle;
+			ldlm_lock_decref(&lock_handle, it->it_lock_mode);
+		}
+
+		it->it_lock_handle = 0;
+		it->it_lock_mode = 0;
+
+		if (it->it_remote_lock_mode) {
+			lock_handle.cookie = it->it_remote_lock_handle;
+			ldlm_lock_decref(&lock_handle,
+					 it->it_remote_lock_mode);
+		}
+
+		it->it_remote_lock_handle = 0;
+		it->it_remote_lock_mode = 0;
+	}
+
 	return rc;
 }