connector: convert to single-threaded workqueue

From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

We don't need one cqueue thread for each CPU.  cqueue is used for
receiving userspace datagrams, which are very rare and thus will
happily live with a single queue.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/connector/cn_queue.c b/drivers/connector/cn_queue.c
index 5732ca3..b6fe7e7 100644
--- a/drivers/connector/cn_queue.c
+++ b/drivers/connector/cn_queue.c
@@ -146,7 +146,7 @@
 
 	dev->nls = nls;
 
-	dev->cn_queue = create_workqueue(dev->name);
+	dev->cn_queue = create_singlethread_workqueue(dev->name);
 	if (!dev->cn_queue) {
 		kfree(dev);
 		return NULL;