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Message-Id: <20220330150620.2490-1-andriy.shevchenko@linux.intel.com>
Date: Wed, 30 Mar 2022 18:06:20 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Bartosz Golaszewski <brgl@...ev.pl>,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 1/1] gpiolib: Get rid of redundant 'else'
In the snippets like the following
if (...)
return / goto / break / continue ...;
else
...
the 'else' is redundant. Get rid of it. In case of IOCTLs use
switch-case pattern that seems the usual in such cases.
While at it, clarify necessity of else in gpiod_direction_output()
by attaching else if to the closing curly brace on a previous line.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: unified with 'part 1' of the change
drivers/gpio/gpiolib-cdev.c | 66 ++++++++++++++++++++-----------------
drivers/gpio/gpiolib.c | 12 +++----
2 files changed, 40 insertions(+), 38 deletions(-)
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index ffa0256cad5a..c2900b1be69d 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -197,16 +197,15 @@ static long linehandle_ioctl(struct file *file, unsigned int cmd,
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
- int i;
+ unsigned int i;
+ int ret;
- if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
- /* NOTE: It's ok to read values of output lines. */
- int ret = gpiod_get_array_value_complex(false,
- true,
- lh->num_descs,
- lh->descs,
- NULL,
- vals);
+ switch (cmd) {
+ case GPIOHANDLE_GET_LINE_VALUES_IOCTL:
+ /* NOTE: It's okay to read values of output lines */
+ ret = gpiod_get_array_value_complex(false, true,
+ lh->num_descs, lh->descs,
+ NULL, vals);
if (ret)
return ret;
@@ -218,7 +217,7 @@ static long linehandle_ioctl(struct file *file, unsigned int cmd,
return -EFAULT;
return 0;
- } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) {
+ case GPIOHANDLE_SET_LINE_VALUES_IOCTL:
/*
* All line descriptors were created at once with the same
* flags so just check if the first one is really output.
@@ -240,10 +239,11 @@ static long linehandle_ioctl(struct file *file, unsigned int cmd,
lh->descs,
NULL,
vals);
- } else if (cmd == GPIOHANDLE_SET_CONFIG_IOCTL) {
+ case GPIOHANDLE_SET_CONFIG_IOCTL:
return linehandle_set_config(lh, ip);
+ default:
+ return -EINVAL;
}
- return -EINVAL;
}
#ifdef CONFIG_COMPAT
@@ -1188,14 +1188,16 @@ static long linereq_ioctl(struct file *file, unsigned int cmd,
struct linereq *lr = file->private_data;
void __user *ip = (void __user *)arg;
- if (cmd == GPIO_V2_LINE_GET_VALUES_IOCTL)
+ switch (cmd) {
+ case GPIO_V2_LINE_GET_VALUES_IOCTL:
return linereq_get_values(lr, ip);
- else if (cmd == GPIO_V2_LINE_SET_VALUES_IOCTL)
+ case GPIO_V2_LINE_SET_VALUES_IOCTL:
return linereq_set_values(lr, ip);
- else if (cmd == GPIO_V2_LINE_SET_CONFIG_IOCTL)
+ case GPIO_V2_LINE_SET_CONFIG_IOCTL:
return linereq_set_config(lr, ip);
-
- return -EINVAL;
+ default:
+ return -EINVAL;
+ }
}
#ifdef CONFIG_COMPAT
@@ -2113,28 +2115,30 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return -ENODEV;
/* Fill in the struct and pass to userspace */
- if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
+ switch (cmd) {
+ case GPIO_GET_CHIPINFO_IOCTL:
return chipinfo_get(cdev, ip);
#ifdef CONFIG_GPIO_CDEV_V1
- } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) {
+ case GPIO_GET_LINEHANDLE_IOCTL:
return linehandle_create(gdev, ip);
- } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
+ case GPIO_GET_LINEEVENT_IOCTL:
return lineevent_create(gdev, ip);
- } else if (cmd == GPIO_GET_LINEINFO_IOCTL ||
- cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) {
- return lineinfo_get_v1(cdev, ip,
- cmd == GPIO_GET_LINEINFO_WATCH_IOCTL);
+ case GPIO_GET_LINEINFO_IOCTL:
+ return lineinfo_get_v1(cdev, ip, false);
+ case GPIO_GET_LINEINFO_WATCH_IOCTL:
+ return lineinfo_get_v1(cdev, ip, true);
#endif /* CONFIG_GPIO_CDEV_V1 */
- } else if (cmd == GPIO_V2_GET_LINEINFO_IOCTL ||
- cmd == GPIO_V2_GET_LINEINFO_WATCH_IOCTL) {
- return lineinfo_get(cdev, ip,
- cmd == GPIO_V2_GET_LINEINFO_WATCH_IOCTL);
- } else if (cmd == GPIO_V2_GET_LINE_IOCTL) {
+ case GPIO_V2_GET_LINEINFO_IOCTL:
+ return lineinfo_get(cdev, ip, false);
+ case GPIO_V2_GET_LINEINFO_WATCH_IOCTL:
+ return lineinfo_get(cdev, ip, true);
+ case GPIO_V2_GET_LINE_IOCTL:
return linereq_create(gdev, ip);
- } else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) {
+ case GPIO_GET_LINEINFO_UNWATCH_IOCTL:
return lineinfo_unwatch(cdev, ip);
+ default:
+ return -EINVAL;
}
- return -EINVAL;
}
#ifdef CONFIG_COMPAT
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 062d127d9a0d..04636ebf4cd8 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -189,9 +189,8 @@ static int gpiochip_find_base(int ngpio)
/* found a free space? */
if (gdev->base + gdev->ngpio <= base)
break;
- else
- /* nope, check the space right before the chip */
- base = gdev->base - ngpio;
+ /* nope, check the space right before the chip */
+ base = gdev->base - ngpio;
}
if (gpio_is_valid(base)) {
@@ -2397,8 +2396,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
ret = gpiod_direction_input(desc);
goto set_output_flag;
}
- }
- else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
+ } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
ret = gpio_set_config(desc, PIN_CONFIG_DRIVE_OPEN_SOURCE);
if (!ret)
goto set_output_value;
@@ -2555,9 +2553,9 @@ static int gpiod_get_raw_value_commit(const struct gpio_desc *desc)
static int gpio_chip_get_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
- if (gc->get_multiple) {
+ if (gc->get_multiple)
return gc->get_multiple(gc, mask, bits);
- } else if (gc->get) {
+ if (gc->get) {
int i, value;
for_each_set_bit(i, mask, gc->ngpio) {
--
2.35.1
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