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clocksource: Save mult_orig in clocksource_disable() 

To fix the common case where ->enable() does not set up
mult, make sure mult_orig is saved in mult on disable.

Also add comments to explain why we do this.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Cc: johnstul@us.ibm.com
Cc: lethal@linux-sh.org
Cc: akpm@linux-foundation.org
LKML-Reference: <20090618152432.10136.9932.sendpatchset@rx1.opensource.se>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Magnus Damm 2009-07-28 14:09:55 -07:00 committed by Ingo Molnar
parent 4be3bd7849
commit c712184368
1 changed files with 13 additions and 1 deletions
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14
include/linux/clocksource.h
View File

@ -293,7 +293,12 @@ static inline int clocksource_enable(struct clocksource *cs)
if (cs->enable) if (cs->enable)
ret = cs->enable(cs); ret = cs->enable(cs);
/* save mult_orig on enable */ /*
* The frequency may have changed while the clocksource
* was disabled. If so the code in ->enable() must update
* the mult value to reflect the new frequency. Make sure
* mult_orig follows this change.
*/
cs->mult_orig = cs->mult; cs->mult_orig = cs->mult;
return ret; return ret;
@ -309,6 +314,13 @@ static inline int clocksource_enable(struct clocksource *cs)
*/ */
static inline void clocksource_disable(struct clocksource *cs) static inline void clocksource_disable(struct clocksource *cs)
{ {
/*
* Save mult_orig in mult so clocksource_enable() can
* restore the value regardless if ->enable() updates
* the value of mult or not.
*/
cs->mult = cs->mult_orig;
if (cs->disable) if (cs->disable)
cs->disable(cs); cs->disable(cs);
} }