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x86_64: use the global PIT lock

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Replace the pcspkr private PIT lock by the global PIT lock to serialize the
PIT access all over the place.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2007-07-21 17:11:18 +02:00 committed by Linus Torvalds
parent 021daae2c2
commit 28318daf79
3 changed files with 16 additions and 3 deletions
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2
arch/x86_64/kernel/time.c
View File

@ -33,6 +33,7 @@
#include <acpi/acpi_bus.h>
#endif
#include <asm/8253pit.h>
#include <asm/i8253.h>
#include <asm/pgtable.h>
#include <asm/vsyscall.h>
#include <asm/timex.h>
@ -51,6 +52,7 @@ static char *timename = NULL;
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
DEFINE_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;

11
drivers/input/misc/pcspkr.c
View File

@ -24,7 +24,12 @@ MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("PC Speaker beeper driver");
MODULE_LICENSE("GPL");
static DEFINE_SPINLOCK(i8253_beep_lock);
#ifdef CONFIG_X86
/* Use the global PIT lock ! */
#include <asm/i8253.h>
#else
static DEFINE_SPINLOCK(i8253_lock);
#endif
static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
@ -43,7 +48,7 @@ static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int c
if (value > 20 && value < 32767)
count = PIT_TICK_RATE / value;
spin_lock_irqsave(&i8253_beep_lock, flags);
spin_lock_irqsave(&i8253_lock, flags);
if (count) {
/* enable counter 2 */
@ -58,7 +63,7 @@ static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int c
outb(inb_p(0x61) & 0xFC, 0x61);
}
spin_unlock_irqrestore(&i8253_beep_lock, flags);
spin_unlock_irqrestore(&i8253_lock, flags);
return 0;
}

6
include/asm-x86_64/i8253.h Normal file
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@ -0,0 +1,6 @@
#ifndef __ASM_I8253_H__
#define __ASM_I8253_H__
extern spinlock_t i8253_lock;
#endif /* __ASM_I8253_H__ */