linux-kernel - Re: [PATCH 4/8] rtc: max77686: remove useless variable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Fri, 15 Oct 2021 22:59:51 +0200
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-watchdog@...r.kernel.org,
        Chiwoong Byun <woong.byun@...sung.com>,
        Laxman Dewangan <ldewangan@...dia.com>
Subject: Re: [PATCH 4/8] rtc: max77686: remove useless variable

Hi,

On 15/10/21 19:33, Alexandre Belloni wrote:
> On 11/10/2021 17:56:11+0200, Luca Ceresoli wrote:
>>> rtc_24hr_mode is set to 1 in max77686_rtc_probe()->max77686_rtc_init_reg()
>> before being read and is never set back to 0 again. As such, it is de facto
>> a constant.
>>
>> Remove the variable and the unreachable code.
>>
>> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
>> ---
>>  drivers/rtc/rtc-max77686.c | 11 +----------
>>  1 file changed, 1 insertion(+), 10 deletions(-)
>>
>> diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
>> index 7e765207f28e..9901c596998a 100644
>> --- a/drivers/rtc/rtc-max77686.c
>> +++ b/drivers/rtc/rtc-max77686.c
>> @@ -99,7 +99,6 @@ struct max77686_rtc_info {
>>  
>>  	int rtc_irq;
>>  	int virq;
>> -	int rtc_24hr_mode;
>>  };
>>  
>>  enum MAX77686_RTC_OP {
>> @@ -278,13 +277,7 @@ static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
>>  
>>  	tm->tm_sec = data[RTC_SEC] & mask;
>>  	tm->tm_min = data[RTC_MIN] & mask;
>> -	if (info->rtc_24hr_mode) {
>> -		tm->tm_hour = data[RTC_HOUR] & 0x1f;
>> -	} else {
>> -		tm->tm_hour = data[RTC_HOUR] & 0x0f;
>> -		if (data[RTC_HOUR] & HOUR_PM_MASK)
> 
> So I guess HOUR_PM_SHIFT and HOUR_PM_MASK can also be removed

Sure. Coming in v2.

Thanks.
-- 
Luca