linux-kernel - [PATCH 15/29] rtc: pcf8523: let the core handle the alarm resolution

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

Message-Id: <20220309162301.61679-15-alexandre.belloni@bootlin.com>
Date:   Wed,  9 Mar 2022 17:22:46 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 15/29] rtc: pcf8523: let the core handle the alarm resolution

Set RTC_FEATURE_ALARM_RES_MINUTE, so the core knows alarms have a
resolution of a minute. Also, the core will properly round down the alarm
instead of up.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-pcf8523.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index cd55fdfe1d39..b1b1943de844 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -212,14 +212,6 @@ static int pcf8523_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
 	if (err < 0)
 		return err;
 
-	/* The alarm has no seconds, round up to nearest minute */
-	if (tm->time.tm_sec) {
-		time64_t alarm_time = rtc_tm_to_time64(&tm->time);
-
-		alarm_time += 60 - tm->time.tm_sec;
-		rtc_time64_to_tm(alarm_time, &tm->time);
-	}
-
 	regs[0] = bin2bcd(tm->time.tm_min);
 	regs[1] = bin2bcd(tm->time.tm_hour);
 	regs[2] = bin2bcd(tm->time.tm_mday);
@@ -450,6 +442,7 @@ static int pcf8523_probe(struct i2c_client *client,
 	rtc->ops = &pcf8523_rtc_ops;
 	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	rtc->range_max = RTC_TIMESTAMP_END_2099;
+	set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->features);
 	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
 
 	if (client->irq > 0) {
-- 
2.35.1