[PATCH 4/4] gpio: sysfs: avoid using kstrtol() in 'value' attribute write

[Christophe Leroy]

A 'perf record' on an app continuously writing in the 'value'
attribute show that most of the time is spent in kstrtol()

--17.99%--value_store
          |
          |--10.17%--kstrtoint
          |          |
          |          |--8.82%--kstrtoll
          |
          |--2.50%--gpiod_set_value_cansleep
          |
          |--1.82%--u16_gpio_set
          |
          |--1.46%--value_store

The normal case is to write 0 or 1 in the attribute, therefore
this patch avoids the call to kstrtol() in the most common cases

Then 'perf record' shows

--7.21%--value_store
          |
          |--2.69%--u16_gpio_set
          |
          |--1.47%--value_store
          |
          |--1.08%--gpiod_set_value_cansleep
          |
          |--0.60%--mutex_lock
          |
           --0.58%--mutex_unlock

Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
 drivers/gpio/gpiolib-sysfs.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index bb10e8ed456e..31e2352632a2 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -8,6 +8,7 @@
 #include <linux/interrupt.h>
 #include <linux/kdev_t.h>
 #include <linux/slab.h>
+#include <linux/ctype.h>
 
 #include "gpiolib.h"
 
@@ -124,7 +125,7 @@ static ssize_t value_store(struct device *dev,
 {
        struct gpiod_data *data = dev_get_drvdata(dev);
        struct gpio_desc *desc = data->desc;
-       ssize_t                 status;
+       ssize_t status = 0;
 
        mutex_lock(&data->mutex);
 
@@ -133,7 +134,11 @@ static ssize_t value_store(struct device *dev,
        } else {
                long            value;
 
-               status = kstrtol(buf, 0, &value);
+               if (size <= 2 && isdigit(buf[0]) &&
+                   (size == 1 || buf[1] == '\n'))
+                       value = buf[0] - '0';
+               else
+                       status = kstrtol(buf, 0, &value);
                if (status == 0) {
                        gpiod_set_value_cansleep(desc, value);
                        status = size;
-- 
2.13.3