[GIT PULL] dlm fix for 2.6.38

[David Teigland <teigland@redhat.com>]

Linus,

Please pull this fix for a dlm regression from:

git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm.git for-linus

Thanks,
Dave

Author: David Teigland <teigland@redhat.com>
Date:   Fri Feb 11 16:44:31 2011 -0600

    dlm: use single thread workqueues
    
    The recent commit to use cmwq for send and recv threads
    dcce240ead802d42b1e45ad2fcb2ed4a399cb255 introduced problems,
    apparently due to multiple workqueue threads.  Single threads
    make the problems go away, so return to that until we fully
    understand the concurrency issues with multiple threads.
    
    Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 9c64ae9..2d8c87b 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1468,15 +1468,13 @@ static void work_stop(void)
 
 static int work_start(void)
 {
-	recv_workqueue = alloc_workqueue("dlm_recv", WQ_MEM_RECLAIM |
-					 WQ_HIGHPRI | WQ_FREEZEABLE, 0);
+	recv_workqueue = create_singlethread_workqueue("dlm_recv");
 	if (!recv_workqueue) {
 		log_print("can't start dlm_recv");
 		return -ENOMEM;
 	}
 
-	send_workqueue = alloc_workqueue("dlm_send", WQ_MEM_RECLAIM |
-					 WQ_HIGHPRI | WQ_FREEZEABLE, 0);
+	send_workqueue = create_singlethread_workqueue("dlm_send");
 	if (!send_workqueue) {
 		log_print("can't start dlm_send");
 		destroy_workqueue(recv_workqueue);