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authorHans de Goede <hdegoede@redhat.com>2018-09-04 17:51:29 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-11-07 19:13:55 +0300
commitfbb974ba693bbfb4e24a62181ef16d4e45febc37 (patch)
treeeb77bc1c8c37007494dfc63d8a5c88ad8ba04ab8 /drivers/rtc
parent651022382c7f8da46cb4872a545ee1da6d097d2a (diff)
downloadlinux-fbb974ba693bbfb4e24a62181ef16d4e45febc37.tar.xz
rtc: cmos: Do not export alarm rtc_ops when we do not support alarms
When there is no IRQ configured for the RTC, the rtc-cmos code does not support alarms, all alarm rtc_ops fail with -EIO / -EINVAL. The rtc-core expects a rtc driver which does not support rtc alarms to not have alarm ops at all. Otherwise the wakealarm sysfs attr will read as empty rather then returning an error, making it impossible for userspace to find out beforehand if alarms are supported. A system without an IRQ for the RTC before this patch: [root@localhost ~]# cat /sys/class/rtc/rtc0/wakealarm [root@localhost ~]# After this patch: [root@localhost ~]# cat /sys/class/rtc/rtc0/wakealarm cat: /sys/class/rtc/rtc0/wakealarm: No such file or directory [root@localhost ~]# This fixes gnome-session + systemd trying to use suspend-then-hibernate, which causes systemd to abort the suspend when writing the RTC alarm fails. BugLink: https://github.com/systemd/systemd/issues/9988 Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-cmos.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index df0c5776d49b..a5a19ff10535 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -257,6 +257,7 @@ static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char rtc_control;
+ /* This not only a rtc_op, but also called directly */
if (!is_valid_irq(cmos->irq))
return -EIO;
@@ -452,6 +453,7 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
unsigned char mon, mday, hrs, min, sec, rtc_control;
int ret;
+ /* This not only a rtc_op, but also called directly */
if (!is_valid_irq(cmos->irq))
return -EIO;
@@ -516,9 +518,6 @@ static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled)
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned long flags;
- if (!is_valid_irq(cmos->irq))
- return -EINVAL;
-
spin_lock_irqsave(&rtc_lock, flags);
if (enabled)
@@ -579,6 +578,12 @@ static const struct rtc_class_ops cmos_rtc_ops = {
.alarm_irq_enable = cmos_alarm_irq_enable,
};
+static const struct rtc_class_ops cmos_rtc_ops_no_alarm = {
+ .read_time = cmos_read_time,
+ .set_time = cmos_set_time,
+ .proc = cmos_procfs,
+};
+
/*----------------------------------------------------------------*/
/*
@@ -855,9 +860,12 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
goto cleanup1;
}
+
+ cmos_rtc.rtc->ops = &cmos_rtc_ops;
+ } else {
+ cmos_rtc.rtc->ops = &cmos_rtc_ops_no_alarm;
}
- cmos_rtc.rtc->ops = &cmos_rtc_ops;
cmos_rtc.rtc->nvram_old_abi = true;
retval = rtc_register_device(cmos_rtc.rtc);
if (retval)