linux-kernel - [PATCH 3/6] gpiolib: cdev: replace if-else chains with switches

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Date:   Wed, 13 Jul 2022 09:37:18 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        brgl@...ev.pl, linus.walleij@...aro.org, dipenp@...dia.com
Cc:     Kent Gibson <warthog618@...il.com>
Subject: [PATCH 3/6] gpiolib: cdev: replace if-else chains with switches

Improve readability by replacing if-else chains with switch
statements.

Signed-off-by: Kent Gibson <warthog618@...il.com>
---
 drivers/gpio/gpiolib-cdev.c | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index f635bbbb6a6d..bc7c8822ede0 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -588,7 +588,8 @@ static enum hte_return process_hw_ts_thread(void *p)
 	le.timestamp_ns = line->timestamp_ns;
 	eflags = READ_ONCE(line->eflags);
 
-	if (eflags == GPIO_V2_LINE_FLAG_EDGE_BOTH) {
+	switch (eflags) {
+	case GPIO_V2_LINE_FLAG_EDGE_BOTH:
 		if (line->raw_level >= 0) {
 			if (test_bit(FLAG_ACTIVE_LOW, &line->desc->flags))
 				level = !line->raw_level;
@@ -602,13 +603,16 @@ static enum hte_return process_hw_ts_thread(void *p)
 			le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
 		else
 			le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
-	} else if (eflags == GPIO_V2_LINE_FLAG_EDGE_RISING) {
+		break;
+	case GPIO_V2_LINE_FLAG_EDGE_RISING:
 		/* Emit low-to-high event */
 		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
-	} else if (eflags == GPIO_V2_LINE_FLAG_EDGE_FALLING) {
+		break;
+	case GPIO_V2_LINE_FLAG_EDGE_FALLING:
 		/* Emit high-to-low event */
 		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
-	} else {
+		break;
+	default:
 		return HTE_CB_HANDLED;
 	}
 	le.line_seqno = line->line_seqno;
@@ -660,7 +664,6 @@ static irqreturn_t edge_irq_thread(int irq, void *p)
 	struct line *line = p;
 	struct linereq *lr = line->req;
 	struct gpio_v2_line_event le;
-	u64 eflags;
 
 	/* Do not leak kernel stack to userspace */
 	memset(&le, 0, sizeof(le));
@@ -679,23 +682,25 @@ static irqreturn_t edge_irq_thread(int irq, void *p)
 	}
 	line->timestamp_ns = 0;
 
-	eflags = READ_ONCE(line->eflags);
-	if (eflags == GPIO_V2_LINE_FLAG_EDGE_BOTH) {
-		int level = gpiod_get_value_cansleep(line->desc);
-
-		if (level)
+	switch (READ_ONCE(line->eflags)) {
+	case GPIO_V2_LINE_FLAG_EDGE_BOTH:
+		if (gpiod_get_value_cansleep(line->desc))
 			/* Emit low-to-high event */
 			le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
 		else
 			/* Emit high-to-low event */
 			le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
-	} else if (eflags == GPIO_V2_LINE_FLAG_EDGE_RISING) {
+
+		break;
+	case GPIO_V2_LINE_FLAG_EDGE_RISING:
 		/* Emit low-to-high event */
 		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
-	} else if (eflags == GPIO_V2_LINE_FLAG_EDGE_FALLING) {
+		break;
+	case GPIO_V2_LINE_FLAG_EDGE_FALLING:
 		/* Emit high-to-low event */
 		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
-	} else {
+		break;
+	default:
 		return IRQ_NONE;
 	}
 	line->line_seqno++;
-- 
2.37.0