From: Thadeu Lima de Souza Cascardo cascardo@canonical.com
ENOTSUPP is not supposed to be returned to userspace. This was found on an OpenPower machine, where the RTC does not support set_alarm.
On that system, a clock_nanosleep(CLOCK_REALTIME_ALARM, ...) results in "524 Unknown error 524"
Replace it with EOPNOTSUPP which results in the expected "95 Operation not supported" error.
Fixes: 1c6b39ad3f01 (alarmtimers: Return -ENOTSUPP if no RTC device is present) Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@canonical.com Signed-off-by: Thomas Gleixner tglx@linutronix.de [ pvorel: backport for v3.16, changes also in alarm_timer_{del,set}(), which were removed in f2c45807d3992fe0f173f34af9c347d907c31686 in v4.13-rc1 ] Signed-off-by: Petr Vorel pvorel@suse.cz Cc: stable@vger.kernel.org # v3.16 Cc: Thadeu Lima de Souza Cascardo cascardo@canonical.com Cc: Ben Hutchings ben@decadent.org.uk Link: https://lkml.kernel.org/r/20190903171802.28314-1-cascardo@canonical.com --- kernel/time/alarmtimer.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index 8c65c236f26a..c3fc69986850 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -533,7 +533,7 @@ static int alarm_timer_create(struct k_itimer *new_timer) struct alarm_base *base;
if (!alarmtimer_get_rtcdev()) - return -ENOTSUPP; + return -EOPNOTSUPP;
if (!capable(CAP_WAKE_ALARM)) return -EPERM; @@ -576,7 +576,7 @@ static void alarm_timer_get(struct k_itimer *timr, static int alarm_timer_del(struct k_itimer *timr) { if (!rtcdev) - return -ENOTSUPP; + return -EOPNOTSUPP;
if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0) return TIMER_RETRY; @@ -600,7 +600,7 @@ static int alarm_timer_set(struct k_itimer *timr, int flags, ktime_t exp;
if (!rtcdev) - return -ENOTSUPP; + return -EOPNOTSUPP;
if (flags & ~TIMER_ABSTIME) return -EINVAL; @@ -761,7 +761,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags, struct restart_block *restart;
if (!alarmtimer_get_rtcdev()) - return -ENOTSUPP; + return -EOPNOTSUPP;
if (flags & ~TIMER_ABSTIME) return -EINVAL;