From 66a2c077c36ee5c56e77ba3757702c4464011da6 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 1 Feb 2008 21:27:02 +0000
Subject: [PATCH] [ARM] xtime_seqlock: fix more ARM machines for xtime
deadlocking
move update_process_times() out from under xtime_lock.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/common/time-acorn.c | 2 --
arch/arm/mach-at91/at91sam926x_time.c | 3 ---
arch/arm/plat-iop/time.c | 4 ----
arch/arm/plat-s3c24xx/time.c | 2 --
4 files changed, 11 deletions(-)
diff --git a/arch/arm/common/time-acorn.c b/arch/arm/common/time-acorn.c
index 34038eccbba9..d544da414731 100644
--- a/arch/arm/common/time-acorn.c
+++ b/arch/arm/common/time-acorn.c
@@ -69,9 +69,7 @@ void __init ioctime_init(void)
static irqreturn_t
ioc_timer_interrupt(int irq, void *dev_id)
{
- write_seqlock(&xtime_lock);
timer_tick();
- write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}
diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index 5c090c9442f5..e38d23770992 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -49,8 +49,6 @@ static irqreturn_t at91sam926x_timer_interrupt(int irq, void *dev_id)
volatile long nr_ticks;
if (at91_sys_read(AT91_PIT_SR) & AT91_PIT_PITS) { /* This is a shared interrupt */
- write_seqlock(&xtime_lock);
-
/* Get number to ticks performed before interrupt and clear PIT interrupt */
nr_ticks = PIT_PICNT(at91_sys_read(AT91_PIT_PIVR));
do {
@@ -58,7 +56,6 @@ static irqreturn_t at91sam926x_timer_interrupt(int irq, void *dev_id)
nr_ticks--;
} while (nr_ticks);
- write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
} else
return IRQ_NONE; /* not handled */
diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c
index ba3d21d8fba3..6fe481ff4fdf 100644
--- a/arch/arm/plat-iop/time.c
+++ b/arch/arm/plat-iop/time.c
@@ -57,8 +57,6 @@ unsigned long iop_gettimeoffset(void)
static irqreturn_t
iop_timer_interrupt(int irq, void *dev_id)
{
- write_seqlock(&xtime_lock);
-
write_tisr(1);
while ((signed long)(next_jiffy_time - read_tcr1())
@@ -67,8 +65,6 @@ iop_timer_interrupt(int irq, void *dev_id)
next_jiffy_time -= ticks_per_jiffy;
}
- write_sequnlock(&xtime_lock);
-
return IRQ_HANDLED;
}
diff --git a/arch/arm/plat-s3c24xx/time.c b/arch/arm/plat-s3c24xx/time.c
index 2ec1daaa0e53..766473b3f98b 100644
--- a/arch/arm/plat-s3c24xx/time.c
+++ b/arch/arm/plat-s3c24xx/time.c
@@ -130,9 +130,7 @@ static unsigned long s3c2410_gettimeoffset (void)
static irqreturn_t
s3c2410_timer_interrupt(int irq, void *dev_id)
{
- write_seqlock(&xtime_lock);
timer_tick();
- write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}