linux-kernel - [PATCH v2 2/2] platform/x86: think-lmi: Use strreplace() to replace a character by nul

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Date:   Mon, 18 Sep 2023 16:51:16 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Mark Pearson <mpearson-lenovo@...ebb.ca>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Mark Pearson <markpearson@...ovo.com>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 2/2] platform/x86: think-lmi: Use strreplace() to replace a character by nul

We can replace
	p = strchrnul(str, '$OLD');
	*p = '\0';
with
	strreplace(str, '$OLD', '\0');
that does the compatible modification without a need of the temporary variable.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: rebased on top of review-hans (Hans), added tag (Ilpo)

 drivers/platform/x86/think-lmi.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 4e0d52dc3944..5a1ceb4298a4 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -198,14 +198,6 @@ static struct think_lmi tlmi_priv;
 static struct class *fw_attr_class;
 static DEFINE_MUTEX(tlmi_mutex);
 
-/* ------ Utility functions ------------*/
-/* Strip out CR if one is present */
-static void strip_cr(char *str)
-{
-	char *p = strchrnul(str, '\n');
-	*p = '\0';
-}
-
 /* Convert BIOS WMI error string to suitable error code */
 static int tlmi_errstr_to_err(const char *errstr)
 {
@@ -411,7 +403,7 @@ static ssize_t current_password_store(struct kobject *kobj,
 
 	strscpy(setting->password, buf, setting->maxlen);
 	/* Strip out CR if one is present, setting password won't work if it is present */
-	strip_cr(setting->password);
+	strreplace(setting->password, '\n', '\0');
 	return count;
 }
 
@@ -921,7 +913,7 @@ static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *at
 static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 {
 	struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
-	char *item, *value, *p;
+	char *item, *value;
 	int ret;
 
 	ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
@@ -934,8 +926,7 @@ static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
 		ret = -EINVAL;
 	else {
 		/* On Workstations remove the Options part after the value */
-		p = strchrnul(value, ';');
-		*p = '\0';
+		strreplace(value, ';', '\0');
 		ret = sysfs_emit(buf, "%s\n", value + 1);
 	}
 	kfree(item);
@@ -1540,7 +1531,6 @@ static int tlmi_analyze(void)
 	for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
 		struct tlmi_attr_setting *setting;
 		char *item = NULL;
-		char *p;
 
 		tlmi_priv.setting[i] = NULL;
 		ret = tlmi_setting(i, &item, LENOVO_BIOS_SETTING_GUID);
@@ -1557,8 +1547,7 @@ static int tlmi_analyze(void)
 		strreplace(item, '/', '\\');
 
 		/* Remove the value part */
-		p = strchrnul(item, ',');
-		*p = '\0';
+		strreplace(item, ',', '\0');
 
 		/* Create a setting entry */
 		setting = kzalloc(sizeof(*setting), GFP_KERNEL);
-- 
2.40.0.1.gaa8946217a0b