diff options
Diffstat (limited to 'drivers/rtc/interface.c')
| -rw-r--r-- | drivers/rtc/interface.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index f8b7c004d6ec..bd8034b7bc93 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -545,7 +545,7 @@ EXPORT_SYMBOL_GPL(rtc_alarm_irq_enable); int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) { - int err; + int rc = 0, err; err = mutex_lock_interruptible(&rtc->ops_lock); if (err) @@ -570,7 +570,9 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) struct rtc_time tm; ktime_t now, onesec; - __rtc_read_time(rtc, &tm); + rc = __rtc_read_time(rtc, &tm); + if (rc) + goto out; onesec = ktime_set(1, 0); now = rtc_tm_to_ktime(tm); rtc->uie_rtctimer.node.expires = ktime_add(now, onesec); @@ -582,6 +584,16 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) out: mutex_unlock(&rtc->ops_lock); + + /* + * __rtc_read_time() failed, this probably means that the RTC time has + * never been set or less probably there is a transient error on the + * bus. In any case, avoid enabling emulation has this will fail when + * reading the time too. + */ + if (rc) + return rc; + #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL /* * Enable emulation if the driver returned -EINVAL to signal that it has |