hv: remove the per-channel workqueue

It's not necessary any longer, since we can safely run the blocking
message handlers in vmbus_connection.work_queue now.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 1 insertions, 32 deletions

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index d69864d4a4d7..0eeb1b3bc048 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -147,43 +147,15 @@ static struct vmbus_channel *alloc_channel(void)
         INIT_LIST_HEAD(&channel->sc_list);
         INIT_LIST_HEAD(&channel->percpu_list);
 
-        channel->controlwq = alloc_workqueue("hv_vmbus_ctl/%d", WQ_MEM_RECLAIM,
-                                             1, channel->id);
-        if (!channel->controlwq) {
-                kfree(channel);
-                return NULL;
-        }
-
         return channel;
 }
 
 /*
- * release_hannel - Release the vmbus channel object itself
- */
-static void release_channel(struct work_struct *work)
-{
-        struct vmbus_channel *channel = container_of(work,
-                                                     struct vmbus_channel,
-                                                     work);
-
-        destroy_workqueue(channel->controlwq);
-
-        kfree(channel);
-}
-
-/*
  * free_channel - Release the resources used by the vmbus channel object
  */
 static void free_channel(struct vmbus_channel *channel)
 {
-
-        /*
-         * We have to release the channel's workqueue/thread in the vmbus's
-         * workqueue/thread context
-         * ie we can't destroy ourselves.
-         */
-        INIT_WORK(&channel->work, release_channel);
-        queue_work(vmbus_connection.work_queue, &channel->work);
+        kfree(channel);
 }
 
 static void percpu_channel_enq(void *arg)
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 80e444bfc9dc..902c37aef67e 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -653,8 +653,6 @@ struct vmbus_channel {
 
         struct hv_device *device_obj;
 
-        struct work_struct work;
-
         enum vmbus_channel_state state;
 
         struct vmbus_channel_offer_channel offermsg;
@@ -675,7 +673,6 @@ struct vmbus_channel {
         struct hv_ring_buffer_info outbound;    /* send to parent */
         struct hv_ring_buffer_info inbound;     /* receive from parent */
         spinlock_t inbound_lock;
-        struct workqueue_struct *controlwq;
 
         struct vmbus_close_msg close_msg;