From: Thadeu Lima de Souza Cascardo cascardo@canonical.com
commit f18ddc13af981ce3c7b7f26925f099e7c6929aba upstream.
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 Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20190903171802.28314-1-cascardo@canonical.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/time/alarmtimer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -673,7 +673,7 @@ static int alarm_timer_create(struct k_i enum alarmtimer_type type;
if (!alarmtimer_get_rtcdev()) - return -ENOTSUPP; + return -EOPNOTSUPP;
if (!capable(CAP_WAKE_ALARM)) return -EPERM; @@ -791,7 +791,7 @@ static int alarm_timer_nsleep(const cloc int ret = 0;
if (!alarmtimer_get_rtcdev()) - return -ENOTSUPP; + return -EOPNOTSUPP;
if (flags & ~TIMER_ABSTIME) return -EINVAL;