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authorLinus Torvalds <torvalds@linux-foundation.org>2009-07-31 12:09:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-07-31 12:09:57 -0700
commit6eb80e00bff341dd09a7ec8b9dba6da8410448bf (patch)
treec0966b7f7d2bb3510de15226a61071abb3d8c453 /include/linux
parentd27d4e2a660939f1bdf74f0e24c4c109f90cd98d (diff)
parentc7121843685de2bf7f3afd3ae1d6a146010bf1fc (diff)
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: clocksource: Save mult_orig in clocksource_disable()
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/clocksource.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index c56457c8334..1219be4fb42 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -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);
}