linux-kernel - [PATCH v1 5/7] ACPI: property: Refactor acpi_data_prop_read

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Date:   Wed, 10 Feb 2021 13:43:18 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 5/7] ACPI: property: Refactor acpi_data_prop_read_single()

Refactor acpi_data_prop_read_single() for less LOCs and better maintenance.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/acpi/property.c | 59 +++++++++++++++++++----------------------
 1 file changed, 28 insertions(+), 31 deletions(-)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 167338fe9b04..f2386ef32ff1 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -785,47 +785,44 @@ static int acpi_data_prop_read_single(const struct acpi_device_data *data,
 				      enum dev_prop_type proptype, void *val)
 {
 	const union acpi_object *obj;
-	int ret;
+	int ret = 0;
 
 	if (!val)
 		return -EINVAL;
 
-	if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
+	if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64)
 		ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
-		if (ret)
-			return ret;
-
-		switch (proptype) {
-		case DEV_PROP_U8:
-			if (obj->integer.value > U8_MAX)
-				return -EOVERFLOW;
-			*(u8 *)val = obj->integer.value;
-			break;
-		case DEV_PROP_U16:
-			if (obj->integer.value > U16_MAX)
-				return -EOVERFLOW;
-			*(u16 *)val = obj->integer.value;
-			break;
-		case DEV_PROP_U32:
-			if (obj->integer.value > U32_MAX)
-				return -EOVERFLOW;
-			*(u32 *)val = obj->integer.value;
-			break;
-		default:
-			*(u64 *)val = obj->integer.value;
-			break;
-		}
-	} else if (proptype == DEV_PROP_STRING) {
+	else if (proptype == DEV_PROP_STRING)
 		ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
-		if (ret)
-			return ret;
+	if (ret)
+		return ret;
 
+	switch (proptype) {
+	case DEV_PROP_U8:
+		if (obj->integer.value > U8_MAX)
+			return -EOVERFLOW;
+		*(u8 *)val = obj->integer.value;
+		break;
+	case DEV_PROP_U16:
+		if (obj->integer.value > U16_MAX)
+			return -EOVERFLOW;
+		*(u16 *)val = obj->integer.value;
+		break;
+	case DEV_PROP_U32:
+		if (obj->integer.value > U32_MAX)
+			return -EOVERFLOW;
+		*(u32 *)val = obj->integer.value;
+		break;
+	case DEV_PROP_U64:
+		*(u64 *)val = obj->integer.value;
+		break;
+	case DEV_PROP_STRING:
 		*(char **)val = obj->string.pointer;
-
 		return 1;
-	} else {
-		ret = -EINVAL;
+	default:
+		return -EINVAL;
 	}
+
 	return ret;
 }
 
-- 
2.30.0