storvsc: Rather than look for sets of specific protocol versions, mak…

…e decisions based on ranges.

Rather than look for sets of specific protocol versions,
make decisions based on ranges. This will be safer and require fewer changes
going forward as we add more storage protocol versions.

Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: Keith Mange <keith.mange@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

drivers/scsi/storvsc_drv.c

@@ -981,8 +981,7 @@ static int storvsc_channel_init(struct hv_device *device)
 	 * support multi-channel.
 	 */
 	max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
-	if ((vmbus_proto_version != VERSION_WIN7) &&
-	   (vmbus_proto_version != VERSION_WS2008))  {
+	if (vmbus_proto_version >= VERSION_WIN8) {
 		if (vstor_packet->storage_channel_properties.flags &
 		    STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
 			process_sub_channels = true;
@@ -1759,18 +1758,15 @@ static int storvsc_probe(struct hv_device *device,
 	 * set state to properly communicate with the host.
 	 */
 
-	switch (vmbus_proto_version) {
-	case VERSION_WS2008:
-	case VERSION_WIN7:
+	if (vmbus_proto_version < VERSION_WIN8) {
 		sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
 		vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
 		vmstor_current_major = VMSTOR_WIN7_MAJOR;
 		vmstor_current_minor = VMSTOR_WIN7_MINOR;
 		max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
 		max_targets = STORVSC_IDE_MAX_TARGETS;
 		max_channels = STORVSC_IDE_MAX_CHANNELS;
-		break;
-	default:
+	} else {
 		sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
 		vmscsi_size_delta = 0;
 		vmstor_current_major = VMSTOR_WIN8_MAJOR;
@@ -1784,7 +1780,6 @@ static int storvsc_probe(struct hv_device *device,
 		 * VCPUs in the guest.
 		 */
 		max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel);
-		break;
 	}
 
 	scsi_driver.can_queue = (max_outstanding_req_per_channel *