gpiolib: cdev: use !mem_is_zero() instead of memchr_inv(s, 0, n)

Use the mem_is_zero() helper where possible.

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20241110201706.16614-1-andy.shevchenko@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 83ebcc8..40f76a9 100644 (file)
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -16,7 +16,6 @@
 #include <linux/hte.h>
 #include <linux/interrupt.h>
 #include <linux/irqreturn.h>
-#include <linux/kernel.h>
 #include <linux/kfifo.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -25,6 +24,7 @@
 #include <linux/poll.h>
 #include <linux/seq_file.h>
 #include <linux/spinlock.h>
+#include <linux/string.h>
 #include <linux/timekeeping.h>
 #include <linux/uaccess.h>
 #include <linux/workqueue.h>
@@ -1215,7 +1215,7 @@ static int gpio_v2_line_config_validate(struct gpio_v2_line_config *lc,
        if (lc->num_attrs > GPIO_V2_LINE_NUM_ATTRS_MAX)
                return -EINVAL;
 
-       if (memchr_inv(lc->padding, 0, sizeof(lc->padding)))
+       if (!mem_is_zero(lc->padding, sizeof(lc->padding)))
                return -EINVAL;
 
        for (i = 0; i < num_lines; i++) {
@@ -1629,7 +1629,7 @@ static int linereq_create(struct gpio_device *gdev, void __user *ip)
        if ((ulr.num_lines == 0) || (ulr.num_lines > GPIO_V2_LINES_MAX))
                return -EINVAL;
 
-       if (memchr_inv(ulr.padding, 0, sizeof(ulr.padding)))
+       if (!mem_is_zero(ulr.padding, sizeof(ulr.padding)))
                return -EINVAL;
 
        lc = &ulr.config;
@@ -2411,7 +2411,7 @@ static int lineinfo_get(struct gpio_chardev_data *cdev, void __user *ip,
        if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
                return -EFAULT;
 
-       if (memchr_inv(lineinfo.padding, 0, sizeof(lineinfo.padding)))
+       if (!mem_is_zero(lineinfo.padding, sizeof(lineinfo.padding)))
                return -EINVAL;
 
        desc = gpio_device_get_desc(cdev->gdev, lineinfo.offset);