[PATCH RTF 1/2] gpiolib: of: Use local variables

[Linus Walleij <linus.walleij@linaro.org>]

Instead of modifying the contents of the array of valued read
in from a phandle, use local variables to store the values.
This makes the code easier to read and the array immutable.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpio/gpiolib-of.c | 39 +++++++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 2e537ee979f3e2b6e8d5f86f3e121a66f2a8e083..86405218f4e2ddc951a1a9d168e886400652bf60 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -1057,6 +1057,9 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 	const char *name;
 	static const char group_names_propname[] = "gpio-ranges-group-names";
 	bool has_group_names;
+	int offset; /* Offset of the first GPIO line on the chip */
+	int pin; /* Pin base number in the range */
+	int count; /* Number of pins/GPIO lines to map */
 
 	np = dev_of_node(&chip->gpiodev->dev);
 	if (!np)
@@ -1075,13 +1078,17 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 		if (!pctldev)
 			return -EPROBE_DEFER;
 
+		offset = pinspec.args[0];
+		pin = pinspec.args[1];
+		count = pinspec.args[2];
+
 		/* Ignore ranges outside of this GPIO chip */
-		if (pinspec.args[0] >= (chip->offset + chip->ngpio))
+		if (offset >= (chip->offset + chip->ngpio))
 			continue;
-		if (pinspec.args[0] + pinspec.args[2] <= chip->offset)
+		if (offset + count <= chip->offset)
 			continue;
 
-		if (pinspec.args[2]) {
+		if (count) {
 			/* npins != 0: linear range */
 			if (has_group_names) {
 				of_property_read_string_index(np,
@@ -1095,27 +1102,27 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 			}
 
 			/* Trim the range to fit this GPIO chip */
-			if (chip->offset > pinspec.args[0]) {
-				trim = chip->offset - pinspec.args[0];
-				pinspec.args[2] -= trim;
-				pinspec.args[1] += trim;
-				pinspec.args[0] = 0;
+			if (chip->offset > offset) {
+				trim = chip->offset - offset;
+				count -= trim;
+				pin += trim;
+				offset = 0;
 			} else {
-				pinspec.args[0] -= chip->offset;
+				offset -= chip->offset;
 			}
-			if ((pinspec.args[0] + pinspec.args[2]) > chip->ngpio)
-				pinspec.args[2] = chip->ngpio - pinspec.args[0];
+			if ((offset + count) > chip->ngpio)
+				count = chip->ngpio - offset;
 
 			ret = gpiochip_add_pin_range(chip,
 					pinctrl_dev_get_devname(pctldev),
-					pinspec.args[0],
-					pinspec.args[1],
-					pinspec.args[2]);
+					offset,
+					pin,
+					count);
 			if (ret)
 				return ret;
 		} else {
 			/* npins == 0: special range */
-			if (pinspec.args[1]) {
+			if (pin) {
 				pr_err("%pOF: Illegal gpio-range format.\n",
 					np);
 				break;
@@ -1140,7 +1147,7 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 			}
 
 			ret = gpiochip_add_pingroup_range(chip, pctldev,
-						pinspec.args[0], name);
+						offset, name);
 			if (ret)
 				return ret;
 		}

-- 
2.48.1