alarmtimer: return EINVAL instead of ENOTSUPP if rtcdev doesn't exist

commit 98d6f4dd84a134d942827584a3c5f67ffd8ec35f upstream.

Fedora Ruby maintainer reported latest Ruby doesn't work on Fedora Rawhide
on ARM. (http://bugs.ruby-lang.org/issues/9008)

Because of, commit 1c6b39ad3f (alarmtimers: Return -ENOTSUPP if no
RTC device is present) intruduced to return ENOTSUPP when
clock_get{time,res} can't find a RTC device. However this is incorrect.

First, ENOTSUPP isn't exported to userland (ENOTSUP or EOPNOTSUP are the
closest userland equivlents).

Second, Posix and Linux man pages agree that clock_gettime and
clock_getres should return EINVAL if clk_id argument is invalid.
While the arugment that the clockid is valid, but just not supported
on this hardware could be made, this is just a technicality that
doesn't help userspace applicaitons, and only complicates error
handling.

Thus, this patch changes the code to use EINVAL.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Reported-by: Vit Ondruch <v.ondruch@tiscali.cz>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
[jstultz: Tweaks to commit message to include full rational]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 8a46f5d..0907e43 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -468,7 +468,7 @@ static int alarm_clock_getres(const clockid_t which_clock, struct timespec *tp)
        clockid_t baseid = alarm_bases[clock2alarm(which_clock)].base_clockid;
 
        if (!alarmtimer_get_rtcdev())
-               return -ENOTSUPP;
+               return -EINVAL;
 
        return hrtimer_get_res(baseid, tp);
 }
@@ -485,7 +485,7 @@ static int alarm_clock_get(clockid_t which_clock, struct timespec *tp)
        struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
 
        if (!alarmtimer_get_rtcdev())
-               return -ENOTSUPP;
+               return -EINVAL;
 
        *tp = ktime_to_timespec(base->gettime());
        return 0;