linux-kernel - [008/156] timekeeping: Prevent oops when GENERIC

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Message-Id: <20100330224725.599479277@linux.site>
Date:	Tue, 30 Mar 2010 15:40:42 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	John Stultz <johnstul@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [008/156] timekeeping: Prevent oops when GENERIC_TIME=n

2.6.33-stable review patch.  If anyone has any objections, please let us know.

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

From: john stultz <johnstul@...ibm.com>

commit ad6759fbf35d104dbf573cd6f4c6784ad6823f7e upstream.

Aaro Koskinen reported an issue in kernel.org bugzilla #15366, where
on non-GENERIC_TIME systems, accessing
/sys/devices/system/clocksource/clocksource0/current_clocksource
results in an oops.

It seems the timekeeper/clocksource rework missed initializing the
curr_clocksource value in the !GENERIC_TIME case.

Thanks to Aaro for reporting and diagnosing the issue as well as
testing the fix!

Reported-by: Aaro Koskinen <aaro.koskinen@....fi>
Signed-off-by: John Stultz <johnstul@...ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
LKML-Reference: <1267475683.4216.61.camel@...alhost.localdomain>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/time/clocksource.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -580,6 +580,10 @@ static inline void clocksource_select(vo
  */
 static int __init clocksource_done_booting(void)
 {
+	mutex_lock(&clocksource_mutex);
+	curr_clocksource = clocksource_default_clock();
+	mutex_unlock(&clocksource_mutex);
+
 	finished_booting = 1;
 
 	/*


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