diff options
Diffstat (limited to 'arch/x86/kernel/i8253.c')
| -rw-r--r-- | arch/x86/kernel/i8253.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c index decc5d2..377c3f8 100644 --- a/arch/x86/kernel/i8253.c +++ b/arch/x86/kernel/i8253.c @@ -18,6 +18,12 @@ DEFINE_SPINLOCK(i8253_lock); EXPORT_SYMBOL(i8253_lock); +#ifdef CONFIG_X86_32 +static void pit_disable_clocksource(void); +#else +static inline void pit_disable_clocksource(void) { } +#endif + /* * HPET replaces the PIT, when enabled. So we need to know, which of * the two timers is used @@ -52,11 +58,13 @@ static void init_pit_timer(enum clock_event_mode mode, outb_p(0, PIT_CH0); outb_p(0, PIT_CH0); } + pit_disable_clocksource(); break; case CLOCK_EVT_MODE_ONESHOT: /* One shot setup */ outb_p(0x38, PIT_MODE); + pit_disable_clocksource(); break; case CLOCK_EVT_MODE_RESUME: @@ -196,6 +204,17 @@ static struct clocksource clocksource_pit = { .shift = 20, }; +static void pit_disable_clocksource(void) +{ + /* + * Use mult to check whether it is registered or not + */ + if (clocksource_pit.mult) { + clocksource_unregister(&clocksource_pit); + clocksource_pit.mult = 0; + } +} + static int __init init_pit_clocksource(void) { /* |