linux-kernel - Re: [PATCH v1 2/2] platform/x86: think-lmi: Use strreplace() to replace a character by nul

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Message-Id: <35e188a5-de18-4b32-98d3-e4f460c23c1f@app.fastmail.com>
Date:   Wed, 13 Sep 2023 09:17:14 -0400
From:   "Mark Pearson" <mpearson-lenovo@...ebb.ca>
To:     "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        "Hans de Goede" <hdegoede@...hat.com>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>, linux-kernel@...r.kernel.org
Cc:     "Mark Pearson" <markpearson@...ovo.com>,
        "markgross@...nel.org" <markgross@...nel.org>
Subject: Re: [PATCH v1 2/2] platform/x86: think-lmi: Use strreplace() to replace a
 character by nul

On Wed, Sep 13, 2023, at 5:27 AM, Andy Shevchenko wrote:
> 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.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  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 94a3c7a74bc4..2f20fafe7f55 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);
> @@ -1418,7 +1409,6 @@ 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);
> @@ -1435,8 +1425,7 @@ 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

Looks good to me. Will aim to test and confirm on some systems.
Thanks for the cleanup!

Mark