linux-kernel - [PATCH 3.2 008/185] alarmtimer: return EINVAL instead of ENOTSUPP if rtcdev doesn't exist

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Message-ID: <lsq.1388282923.830646529@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Frederic Weisbecker" <fweisbec@...il.com>,
	"John Stultz" <john.stultz@...aro.org>,
	"Vit Ondruch" <v.ondruch@...cali.cz>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: [PATCH 3.2 008/185] alarmtimer: return EINVAL instead of ENOTSUPP
 if rtcdev doesn't exist

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

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@...utronix.de>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Reported-by: Vit Ondruch <v.ondruch@...cali.cz>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
[jstultz: Tweaks to commit message to include full rational]
Signed-off-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/time/alarmtimer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -468,7 +468,7 @@ static int alarm_clock_getres(const cloc
 	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 whi
 	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;

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