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authorPatrick Caulfield <pcaulfie@redhat.com>2007-02-01 16:46:33 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2007-02-05 13:38:27 -0500
commita34fbc6363256387372331000462691bc4b3f5a9 (patch)
treed211465adf24f06d772cfbc78b92269771f46b07 /fs
parent[DLM] zero new user lvbs (diff)
downloadlinux-dev-a34fbc6363256387372331000462691bc4b3f5a9.tar.xz
linux-dev-a34fbc6363256387372331000462691bc4b3f5a9.zip
[DLM] fix softlockup in dlm_recv
This patch stops the dlm_recv workqueue from busy-waiting when a node disconnects. This can cause soft lockup errors on debug systems and bad performance generally. Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/dlm/lowcomms-tcp.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/dlm/lowcomms-tcp.c b/fs/dlm/lowcomms-tcp.c
index 18ade44287e7..f1efd17b2614 100644
--- a/fs/dlm/lowcomms-tcp.c
+++ b/fs/dlm/lowcomms-tcp.c
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -109,7 +109,6 @@ struct connection {
struct page *rx_page;
struct cbuf cb;
int retries;
- atomic_t waiting_requests;
#define MAX_CONNECT_RETRIES 3
struct connection *othercon;
struct work_struct rwork; /* Receive workqueue */
@@ -278,8 +277,11 @@ static int receive_from_sock(struct connection *con)
mutex_lock(&con->sock_mutex);
- if (con->sock == NULL)
- goto out;
+ if (con->sock == NULL) {
+ ret = -EAGAIN;
+ goto out_close;
+ }
+
if (con->rx_page == NULL) {
/*
* This doesn't need to be atomic, but I think it should
@@ -352,7 +354,6 @@ static int receive_from_sock(struct connection *con)
con->rx_page = NULL;
}
-out:
if (call_again_soon)
goto out_resched;
mutex_unlock(&con->sock_mutex);
@@ -370,6 +371,9 @@ out_close:
close_connection(con, false);
/* Reconnect when there is something to send */
}
+ /* Don't return success if we really got EOF */
+ if (ret == 0)
+ ret = -EAGAIN;
return ret;
}
@@ -847,7 +851,6 @@ int dlm_lowcomms_close(int nodeid)
if (con) {
clean_one_writequeue(con);
close_connection(con, true);
- atomic_set(&con->waiting_requests, 0);
}
return 0;