i8253: Convert i8253_lock to raw_spinlock
i8253_lock needs to be a real spinlock in preempt-rt, i.e. it can
not be converted to a sleeping lock.
Convert it to raw_spinlock and fix up all users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Cc: Jens Axboe <jens.axboe@oracle.com>
LKML-Reference: <20100217163751.030764372@linutronix.de>
diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index ed5c441..9479406 100644
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -15,7 +15,7 @@
#include <asm/io.h>
#include <asm/time.h>
-DEFINE_SPINLOCK(i8253_lock);
+DEFINE_RAW_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
/*
@@ -26,7 +26,7 @@
static void init_pit_timer(enum clock_event_mode mode,
struct clock_event_device *evt)
{
- spin_lock(&i8253_lock);
+ raw_spin_lock(&i8253_lock);
switch(mode) {
case CLOCK_EVT_MODE_PERIODIC:
@@ -55,7 +55,7 @@
/* Nothing to do here */
break;
}
- spin_unlock(&i8253_lock);
+ raw_spin_unlock(&i8253_lock);
}
/*
@@ -65,10 +65,10 @@
*/
static int pit_next_event(unsigned long delta, struct clock_event_device *evt)
{
- spin_lock(&i8253_lock);
+ raw_spin_lock(&i8253_lock);
outb_p(delta & 0xff , PIT_CH0); /* LSB */
outb(delta >> 8 , PIT_CH0); /* MSB */
- spin_unlock(&i8253_lock);
+ raw_spin_unlock(&i8253_lock);
return 0;
}
@@ -137,7 +137,7 @@
static int old_count;
static u32 old_jifs;
- spin_lock_irqsave(&i8253_lock, flags);
+ raw_spin_lock_irqsave(&i8253_lock, flags);
/*
* Although our caller may have the read side of xtime_lock,
* this is now a seqlock, and we are cheating in this routine
@@ -183,7 +183,7 @@
old_count = count;
old_jifs = jifs;
- spin_unlock_irqrestore(&i8253_lock, flags);
+ raw_spin_unlock_irqrestore(&i8253_lock, flags);
count = (LATCH - 1) - count;