From: jxiong <jxiong>
Date: Wed, 4 Mar 2009 05:21:25 +0000 (+0000)
Subject: b=18380
X-Git-Tag: v1_9_164~33
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=206ca53585f883634b712f27f8d059700604dacc

b=18380
r=nathan,wangdi

Fix a deadlock case for procfs.
---

diff --git a/lustre/ldlm/ldlm_lib.c b/lustre/ldlm/ldlm_lib.c
index b400a27..8687129 100644
--- a/lustre/ldlm/ldlm_lib.c
+++ b/lustre/ldlm/ldlm_lib.c
@@ -411,9 +411,15 @@ int client_connect_import(const struct lu_env *env,
 
         if (obd->obd_namespace != NULL)
                 CERROR("already have namespace!\n");
+
+        /*
+         * Deadlock case - bug 18380
+         */
+        up_write(&cli->cl_sem);
         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
                                                 LDLM_NAMESPACE_CLIENT,
                                                 LDLM_NAMESPACE_GREEDY);
+        down_write(&cli->cl_sem);
         if (obd->obd_namespace == NULL)
                 GOTO(out_disco, rc = -ENOMEM);