x86_64: use the global PIT lock

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>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/input/misc/pcspkr.c b/drivers/input/misc/pcspkr.c
index 31989dcd922c..906bf5e8de89 100644
--- a/drivers/input/misc/pcspkr.c
+++ b/drivers/input/misc/pcspkr.c
@@ -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;
 }