提交 c7121843 编写于 作者: M Magnus Damm 提交者: Ingo Molnar

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: NMagnus 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: NThomas Gleixner <tglx@linutronix.de>
上级 4be3bd78
......@@ -293,7 +293,12 @@ static inline int clocksource_enable(struct clocksource *cs)
if (cs->enable)
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;
return ret;
......@@ -309,6 +314,13 @@ static inline int clocksource_enable(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)
cs->disable(cs);
}
......
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