Staging: hv: vmbus_drv: Introduce state in struct vmbus_channel to track util services

In preparation for getting rid of util channel synchronization based on
counting util channels, introduce state in  struct vmbus_channel  to
track util services.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/channel_mgmt.c

@@ -419,6 +419,7 @@ static void vmbus_process_offer(struct work_struct *work)
 		 * can cleanup properly
 		 */
 		newchannel->state = CHANNEL_OPEN_STATE;
+		newchannel->util_index = -1; /* Invalid index */
 
 		/* Open IC channels */
 		for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
@@ -430,6 +431,7 @@ static void vmbus_process_offer(struct work_struct *work)
 						 hv_cb_utils[cnt].callback,
 						 newchannel) == 0) {
 				hv_cb_utils[cnt].channel = newchannel;
+				newchannel->util_index = cnt;
 
 				pr_info("%s\n", hv_cb_utils[cnt].log_msg);
 

drivers/staging/hv/hyperv.h

@@ -532,6 +532,11 @@ struct vmbus_channel {
 	struct work_struct work;
 
 	enum vmbus_channel_state state;
+	/*
+	 * For util channels, stash the
+	 * the service index for easy access.
+	 */
+	s8 util_index;
 
 	struct vmbus_channel_offer_channel offermsg;
 	/*