staging: unisys: refactor create_device()

OK, lets clean up this messy function. The entire thing is reflowed so spacing
and indentation is correct. Tests that created extra indentation were swapped
for equivalent negative tests that did not create extra indentation. Use of
cmp_uuid_le() were fixed to test specifically for the zero case, and not to
lazily use !cmp_uuid_le(). CamelCase local variable names were fixed:

busNo => bus_no
devNo => dev_no
minSize => min_size
pReqHandler => req_handler
Away => cleanup

Finally, the struct guest_msgs cmd declaration was moved to the beginning of
the function, and cringing and wincing at the function was significantly
reduced.
Signed-off-by: Bryan Thompson <bryan.thompson@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/uislib/uislib.c

@@ -339,26 +339,26 @@ destroy_bus(struct controlvm_message *msg, char *buf)
 	return CONTROLVM_RESP_SUCCESS;
 }
 
-static int
-create_device(struct controlvm_message *msg, char *buf)
+static int create_device(struct controlvm_message *msg, char *buf)
 {
 	struct device_info *dev;
 	struct bus_info *bus;
-	u32 busNo, devNo;
+	struct guest_msgs cmd;
+	u32 bus_no, dev_no;
 	int result = CONTROLVM_RESP_SUCCESS;
-	u64 minSize = MIN_IO_CHANNEL_SIZE;
-	struct req_handler_info *pReqHandler;
+	u64 min_size = MIN_IO_CHANNEL_SIZE;
+	struct req_handler_info *req_handler;
 
-	busNo = msg->cmd.create_device.bus_no;
-	devNo = msg->cmd.create_device.dev_no;
+	bus_no = msg->cmd.create_device.bus_no;
+	dev_no = msg->cmd.create_device.dev_no;
 
-	POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, devNo, busNo,
+	POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no,
 			 POSTCODE_SEVERITY_INFO);
 
 	dev = kzalloc(sizeof(*dev), GFP_ATOMIC);
 	if (!dev) {
 		LOGERR("CONTROLVM_DEVICE_CREATE Failed: kmalloc for dev failed.\n");
-		POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
+		POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
 				 POSTCODE_SEVERITY_ERR);
 		return CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
 	}
@@ -366,28 +366,28 @@ create_device(struct controlvm_message *msg, char *buf)
 	dev->channel_uuid = msg->cmd.create_device.data_type_uuid;
 	dev->intr = msg->cmd.create_device.intr;
 	dev->channel_addr = msg->cmd.create_device.channel_addr;
-	dev->bus_no = busNo;
-	dev->dev_no = devNo;
+	dev->bus_no = bus_no;
+	dev->dev_no = dev_no;
 	sema_init(&dev->interrupt_callback_lock, 1);	/* unlocked */
-	sprintf(dev->devid, "vbus%u:dev%u", (unsigned)busNo, (unsigned)devNo);
+	sprintf(dev->devid, "vbus%u:dev%u", (unsigned)bus_no, (unsigned)dev_no);
 	/* map the channel memory for the device. */
 	if (msg->hdr.flags.test_message) {
 		dev->chanptr = (void __iomem *)__va(dev->channel_addr);
 	} else {
-		pReqHandler = req_handler_find(dev->channel_uuid);
-		if (pReqHandler)
+		req_handler = req_handler_find(dev->channel_uuid);
+		if (req_handler)
 			/* generic service handler registered for this
 			 * channel
 			 */
-			minSize = pReqHandler->min_channel_bytes;
-		if (minSize > msg->cmd.create_device.channel_bytes) {
+			min_size = req_handler->min_channel_bytes;
+		if (min_size > msg->cmd.create_device.channel_bytes) {
 			LOGERR("CONTROLVM_DEVICE_CREATE Failed: channel size is too small, channel size:0x%lx, required size:0x%lx",
-			       (ulong) msg->cmd.create_device.channel_bytes,
-			       (ulong) minSize);
-			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
-					 POSTCODE_SEVERITY_ERR);
+			       (ulong)msg->cmd.create_device.channel_bytes,
+			       (ulong)min_size);
+			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_ERR);
 			result = CONTROLVM_RESP_ERROR_CHANNEL_SIZE_TOO_SMALL;
-			goto Away;
+			goto cleanup;
 		}
 		dev->chanptr =
 		    uislib_ioremap_cache(dev->channel_addr,
@@ -397,9 +397,9 @@ create_device(struct controlvm_message *msg, char *buf)
 			       dev->channel_addr,
 			       msg->cmd.create_device.channel_bytes);
 			result = CONTROLVM_RESP_ERROR_IOREMAP_FAILED;
-			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
-					 POSTCODE_SEVERITY_ERR);
-			goto Away;
+			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_ERR);
+			goto cleanup;
 		}
 	}
 	dev->instance_uuid = msg->cmd.create_device.dev_inst_uuid;
@@ -407,128 +407,116 @@ create_device(struct controlvm_message *msg, char *buf)
 
 	read_lock(&bus_list_lock);
 	for (bus = bus_list; bus; bus = bus->next) {
-		if (bus->bus_no == busNo) {
+		if (bus->bus_no != bus_no)
+			continue;
 		/* make sure the device number is valid */
-			if (devNo >= bus->device_count) {
+		if (dev_no >= bus->device_count) {
 			LOGERR("CONTROLVM_DEVICE_CREATE Failed: device (%d) >= deviceCount (%d).",
-				       devNo, bus->device_count);
+			       dev_no, bus->device_count);
 			result = CONTROLVM_RESP_ERROR_MAX_DEVICES;
-				POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC,
-						 devNo, busNo,
-						 POSTCODE_SEVERITY_ERR);
+			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_ERR);
 			read_unlock(&bus_list_lock);
-				goto Away;
+			goto cleanup;
 		}
 		/* make sure this device is not already set */
-			if (bus->device[devNo]) {
+		if (bus->device[dev_no]) {
 			LOGERR("CONTROLVM_DEVICE_CREATE Failed: device %d is already exists.",
-				       devNo);
+			       dev_no);
 			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC,
-						 devNo, busNo,
+					 dev_no, bus_no,
 					 POSTCODE_SEVERITY_ERR);
 			result = CONTROLVM_RESP_ERROR_ALREADY_DONE;
 			read_unlock(&bus_list_lock);
-				goto Away;
+			goto cleanup;
 		}
 		read_unlock(&bus_list_lock);
 		/* the msg is bound for virtpci; send
 		 * guest_msgs struct to callback
 		 */
-			if (!msg->hdr.flags.server) {
-				struct guest_msgs cmd;
-
-				if (!uuid_le_cmp(dev->channel_uuid,
-				    spar_vhba_channel_protocol_uuid)) {
-					wait_for_valid_guid(&((
-						struct channel_header
-							__iomem *) (dev->
-								  chanptr))->
-							    chtype);
-					if (!SPAR_VHBA_CHANNEL_OK_CLIENT
-					    (dev->chanptr)) {
+		if (msg->hdr.flags.server) {
+			bus->device[dev_no] = dev;
+			POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_INFO);
+			return CONTROLVM_RESP_SUCCESS;
+		}
+		if (uuid_le_cmp(dev->channel_uuid,
+				spar_vhba_channel_protocol_uuid) == 0) {
+			wait_for_valid_guid(&((struct channel_header __iomem *)
+					    (dev->chanptr))->chtype);
+			if (!SPAR_VHBA_CHANNEL_OK_CLIENT(dev->chanptr)) {
 				LOGERR("CONTROLVM_DEVICE_CREATE Failed:[CLIENT]VHBA dev %d chan invalid.",
-						       devNo);
-						POSTCODE_LINUX_4
-						    (DEVICE_CREATE_FAILURE_PC,
-						     devNo, busNo,
+				       dev_no);
+				POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC,
+						 dev_no, bus_no,
 						 POSTCODE_SEVERITY_ERR);
 				result = CONTROLVM_RESP_ERROR_CHANNEL_INVALID;
-						goto Away;
+				goto cleanup;
 			}
 			cmd.msgtype = GUEST_ADD_VHBA;
 			cmd.add_vhba.chanptr = dev->chanptr;
-					cmd.add_vhba.bus_no = busNo;
-					cmd.add_vhba.device_no = devNo;
-					cmd.add_vhba.instance_uuid =
-					    dev->instance_uuid;
+			cmd.add_vhba.bus_no = bus_no;
+			cmd.add_vhba.device_no = dev_no;
+			cmd.add_vhba.instance_uuid = dev->instance_uuid;
 			cmd.add_vhba.intr = dev->intr;
-				} else
-				    if (!uuid_le_cmp(dev->channel_uuid,
-					 spar_vnic_channel_protocol_uuid)) {
-					wait_for_valid_guid(&((
-						struct channel_header
-							__iomem *) (dev->
-								  chanptr))->
-							    chtype);
-					if (!SPAR_VNIC_CHANNEL_OK_CLIENT
-					    (dev->chanptr)) {
+		} else if (uuid_le_cmp(dev->channel_uuid,
+				       spar_vnic_channel_protocol_uuid) == 0) {
+			wait_for_valid_guid(&((struct channel_header __iomem *)
+					    (dev->chanptr))->chtype);
+			if (!SPAR_VNIC_CHANNEL_OK_CLIENT(dev->chanptr)) {
 				LOGERR("CONTROLVM_DEVICE_CREATE Failed: VNIC[CLIENT] dev %d chan invalid.",
-						       devNo);
-						POSTCODE_LINUX_4
-						    (DEVICE_CREATE_FAILURE_PC,
-						     devNo, busNo,
+				       dev_no);
+				POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC,
+						 dev_no, bus_no,
 						 POSTCODE_SEVERITY_ERR);
 				result = CONTROLVM_RESP_ERROR_CHANNEL_INVALID;
-						goto Away;
+				goto cleanup;
 			}
 			cmd.msgtype = GUEST_ADD_VNIC;
 			cmd.add_vnic.chanptr = dev->chanptr;
-					cmd.add_vnic.bus_no = busNo;
-					cmd.add_vnic.device_no = devNo;
-					cmd.add_vnic.instance_uuid =
-					    dev->instance_uuid;
+			cmd.add_vnic.bus_no = bus_no;
+			cmd.add_vnic.device_no = dev_no;
+			cmd.add_vnic.instance_uuid = dev->instance_uuid;
 			cmd.add_vhba.intr = dev->intr;
 		} else {
 			LOGERR("CONTROLVM_DEVICE_CREATE Failed: unknown channelTypeGuid.\n");
-					POSTCODE_LINUX_4
-					    (DEVICE_CREATE_FAILURE_PC, devNo,
-					     busNo, POSTCODE_SEVERITY_ERR);
+			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_ERR);
 			result = CONTROLVM_RESP_ERROR_CHANNEL_TYPE_UNKNOWN;
-					goto Away;
+			goto cleanup;
 		}
 
 		if (!virt_control_chan_func) {
 			LOGERR("CONTROLVM_DEVICE_CREATE Failed: virtpci callback not registered.");
-					POSTCODE_LINUX_4
-					    (DEVICE_CREATE_FAILURE_PC, devNo,
-					     busNo, POSTCODE_SEVERITY_ERR);
+			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_ERR);
 			result = CONTROLVM_RESP_ERROR_VIRTPCI_DRIVER_FAILURE;
-					goto Away;
+			goto cleanup;
 		}
 
 		if (!virt_control_chan_func(&cmd)) {
 			LOGERR("CONTROLVM_DEVICE_CREATE Failed: virtpci GUEST_ADD_[VHBA||VNIC] returned error.");
-					POSTCODE_LINUX_4
-					    (DEVICE_CREATE_FAILURE_PC, devNo,
-					     busNo, POSTCODE_SEVERITY_ERR);
-					result = CONTROLVM_RESP_ERROR_VIRTPCI_DRIVER_CALLBACK_ERROR;
-					goto Away;
-				}
+			POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no,
+					 bus_no, POSTCODE_SEVERITY_ERR);
+			result =
+			     CONTROLVM_RESP_ERROR_VIRTPCI_DRIVER_CALLBACK_ERROR;
+			goto cleanup;
 		}
-			bus->device[devNo] = dev;
-			POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, devNo, busNo,
-					 POSTCODE_SEVERITY_INFO);
+
+		bus->device[dev_no] = dev;
+		POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no,
+				 bus_no, POSTCODE_SEVERITY_INFO);
 		return CONTROLVM_RESP_SUCCESS;
 	}
-	}
 	read_unlock(&bus_list_lock);
 
-	LOGERR("CONTROLVM_DEVICE_CREATE Failed: failed to find bus %d.", busNo);
-	POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, devNo, busNo,
+	LOGERR("CONTROLVM_DEVICE_CREATE Failed: failed to find bus %d.",
+	       bus_no);
+	POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
 			 POSTCODE_SEVERITY_ERR);
 	result = CONTROLVM_RESP_ERROR_BUS_INVALID;
 
-Away:
+cleanup:
 	if (!msg->hdr.flags.test_message) {
 		uislib_iounmap(dev->chanptr);
 		dev->chanptr = NULL;