From: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
[ 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@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v3.16
Cc: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20190903171802.28314-1-cascardo@xxxxxxxxxxxxx
---
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;
