platform/x86: huawei-wmi: No need to keep pointer to platform device

There is no need to keep a pointer to the platform device. Currently there are
no users of it directly, and if there will be in the future we may restore it
from pointer to the struct device.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/huawei-wmi.c

@@ -65,7 +65,7 @@ struct huawei_wmi {
 	struct huawei_wmi_debug debug;
 	struct input_dev *idev[2];
 	struct led_classdev cdev;
-	struct platform_device *pdev;
+	struct device *dev;
 
 	struct mutex battery_lock;
 	struct mutex wmi_lock;
@@ -152,7 +152,7 @@ static int huawei_wmi_call(struct acpi_buffer *in, struct acpi_buffer *out)
 	status = wmi_evaluate_method(HWMI_METHOD_GUID, 0, 1, in, out);
 	mutex_unlock(&huawei_wmi->wmi_lock);
 	if (ACPI_FAILURE(status)) {
-		dev_err(&huawei_wmi->pdev->dev, "Failed to evaluate wmi method\n");
+		dev_err(huawei_wmi->dev, "Failed to evaluate wmi method\n");
 		return -ENODEV;
 	}
 
@@ -202,7 +202,7 @@ static int huawei_wmi_cmd(u64 arg, u8 *buf, size_t buflen)
 				obj->buffer.pointer += 4;
 				len = 0x100;
 			} else {
-				dev_err(&huawei_wmi->pdev->dev, "Bad buffer length, got %d\n", obj->buffer.length);
+				dev_err(huawei_wmi->dev, "Bad buffer length, got %d\n", obj->buffer.length);
 				err = -EIO;
 				goto fail_cmd;
 			}
@@ -213,14 +213,14 @@ static int huawei_wmi_cmd(u64 arg, u8 *buf, size_t buflen)
 		 */
 		case ACPI_TYPE_PACKAGE:
 			if (obj->package.count != 2) {
-				dev_err(&huawei_wmi->pdev->dev, "Bad package count, got %d\n", obj->package.count);
+				dev_err(huawei_wmi->dev, "Bad package count, got %d\n", obj->package.count);
 				err = -EIO;
 				goto fail_cmd;
 			}
 
 			obj = &obj->package.elements[1];
 			if (obj->type != ACPI_TYPE_BUFFER) {
-				dev_err(&huawei_wmi->pdev->dev, "Bad package element type, got %d\n", obj->type);
+				dev_err(huawei_wmi->dev, "Bad package element type, got %d\n", obj->type);
 				err = -EIO;
 				goto fail_cmd;
 			}
@@ -229,7 +229,7 @@ static int huawei_wmi_cmd(u64 arg, u8 *buf, size_t buflen)
 			break;
 		/* Shouldn't get here! */
 		default:
-			dev_err(&huawei_wmi->pdev->dev, "Unexpected obj type, got: %d\n", obj->type);
+			dev_err(huawei_wmi->dev, "Unexpected obj type, got: %d\n", obj->type);
 			err = -EIO;
 			goto fail_cmd;
 		}
@@ -633,7 +633,7 @@ static void huawei_wmi_debugfs_call_dump(struct seq_file *m, void *data,
 		seq_puts(m, "]");
 		break;
 	default:
-		dev_err(&huawei->pdev->dev, "Unexpected obj type, got %d\n", obj->type);
+		dev_err(huawei->dev, "Unexpected obj type, got %d\n", obj->type);
 		return;
 	}
 }
@@ -788,7 +788,7 @@ static int huawei_wmi_probe(struct platform_device *pdev)
 	int err;
 
 	platform_set_drvdata(pdev, huawei_wmi);
-	huawei_wmi->pdev = pdev;
+	huawei_wmi->dev = &pdev->dev;
 
 	while (*guid->guid_string) {
 		struct input_dev *idev = *huawei_wmi->idev;
@@ -883,7 +883,9 @@ static __init int huawei_wmi_init(void)
 
 static __exit void huawei_wmi_exit(void)
 {
-	platform_device_unregister(huawei_wmi->pdev);
+	struct platform_device *pdev = to_platform_device(huawei_wmi->dev);
+
+	platform_device_unregister(pdev);
 	platform_driver_unregister(&huawei_wmi_driver);
 
 	kfree(huawei_wmi);