diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 602ca86..740edec 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -471,18 +471,26 @@
 }
 EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
 
+static void reset_channel_cb(void *arg)
+{
+	struct vmbus_channel *channel = arg;
+
+	channel->onchannel_callback = NULL;
+}
+
 static void vmbus_close_internal(struct vmbus_channel *channel)
 {
 	struct vmbus_channel_close_channel *msg;
 	int ret;
-	unsigned long flags;
 
 	channel->state = CHANNEL_OPEN_STATE;
 	channel->sc_creation_callback = NULL;
 	/* Stop callback and cancel the timer asap */
-	spin_lock_irqsave(&channel->inbound_lock, flags);
-	channel->onchannel_callback = NULL;
-	spin_unlock_irqrestore(&channel->inbound_lock, flags);
+	if (channel->target_cpu != smp_processor_id())
+		smp_call_function_single(channel->target_cpu, reset_channel_cb,
+					 channel, true);
+	else
+		reset_channel_cb(channel);
 
 	/* Send a closing message */
 
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index fa92046..6f7fdd9 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -365,7 +365,7 @@
  * performance critical channels (IDE, SCSI and Network) will be uniformly
  * distributed across all available CPUs.
  */
-static u32 get_vp_index(uuid_le *type_guid)
+static void init_vp_index(struct vmbus_channel *channel, uuid_le *type_guid)
 {
 	u32 cur_cpu;
 	int i;
@@ -387,10 +387,13 @@
 		 * Also if the channel is not a performance critical
 		 * channel, bind it to cpu 0.
 		 */
-		return 0;
+		channel->target_cpu = 0;
+		channel->target_vp = 0;
+		return;
 	}
 	cur_cpu = (++next_vp % max_cpus);
-	return hv_context.vp_index[cur_cpu];
+	channel->target_cpu = cur_cpu;
+	channel->target_vp = hv_context.vp_index[cur_cpu];
 }
 
 /*
@@ -438,7 +441,7 @@
 				offer->connection_id;
 	}
 
-	newchannel->target_vp = get_vp_index(&offer->offer.if_type);
+	init_vp_index(newchannel, &offer->offer.if_type);
 
 	memcpy(&newchannel->offermsg, offer,
 	       sizeof(struct vmbus_channel_offer_channel));
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 2e7801a..df2363e 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -277,7 +277,6 @@
 static void process_chn_event(u32 relid)
 {
 	struct vmbus_channel *channel;
-	unsigned long flags;
 	void *arg;
 	bool read_state;
 	u32 bytes_to_read;
@@ -296,13 +295,12 @@
 	/*
 	 * A channel once created is persistent even when there
 	 * is no driver handling the device. An unloading driver
-	 * sets the onchannel_callback to NULL under the
-	 * protection of the channel inbound_lock. Thus, checking
-	 * and invoking the driver specific callback takes care of
-	 * orderly unloading of the driver.
+	 * sets the onchannel_callback to NULL on the same CPU
+	 * as where this interrupt is handled (in an interrupt context).
+	 * Thus, checking and invoking the driver specific callback takes
+	 * care of orderly unloading of the driver.
 	 */
 
-	spin_lock_irqsave(&channel->inbound_lock, flags);
 	if (channel->onchannel_callback != NULL) {
 		arg = channel->channel_callback_context;
 		read_state = channel->batched_reading;
@@ -327,7 +325,6 @@
 		pr_err("no channel callback for relid - %u\n", relid);
 	}
 
-	spin_unlock_irqrestore(&channel->inbound_lock, flags);
 }
 
 /*
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2d7b4f1..a274e08 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -696,6 +696,8 @@
 	 * preserve the earlier behavior.
 	 */
 	u32 target_vp;
+	/* The corresponding CPUID in the guest */
+	u32 target_cpu;
 	/*
 	 * Support for sub-channels. For high performance devices,
 	 * it will be useful to have multiple sub-channels to support