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[ARM] Fix timer damage from d3d74453c3 

Move the xtime write mode seqlock into timer_tick(), so it only
surrounds the call to do_timer().

This avoids a deadlock in update_process_times() ...
hrtimer_get_softirq_time() which tries to get a read mode seqlock
on xtime, thereby preventing booting.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2008-01-28 10:16:37 +00:00 committed by Russell King
parent 6232be32af
commit 193c3cc125
21 changed files with 2 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/kernel/time.c
View File

@ -325,7 +325,9 @@ void timer_tick(void)
profile_tick(CPU_PROFILING);
do_leds();
do_set_rtc();
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));
#endif

4
arch/arm/mach-aaec2000/core.c
View File

@ -130,13 +130,9 @@ static irqreturn_t
aaec2000_timer_interrupt(int irq, void *dev_id)
{
/* TODO: Check timer accuracy */
write_seqlock(&xtime_lock);
timer_tick();
TIMER1_CLEAR = 1;
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

2
arch/arm/mach-clps711x/time.c
View File

@ -50,9 +50,7 @@ static unsigned long clps711x_gettimeoffset(void)
static irqreturn_t
p720t_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-clps7500/core.c
View File

@ -298,8 +298,6 @@ extern unsigned long ioc_timer_gettimeoffset(void);
static irqreturn_t
clps7500_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
/* Why not using do_leds interface?? */
@ -313,8 +311,6 @@ clps7500_timer_interrupt(int irq, void *dev_id)
}
}
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-ebsa110/core.c
View File

@ -178,8 +178,6 @@ ebsa110_timer_interrupt(int irq, void *dev_id)
{
u32 count;
write_seqlock(&xtime_lock);
/* latch and read timer 1 */
__raw_writeb(0x40, PIT_CTRL);
count = __raw_readb(PIT_T1);
@ -192,8 +190,6 @@ ebsa110_timer_interrupt(int irq, void *dev_id)
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-ep93xx/core.c
View File

@ -99,8 +99,6 @@ static unsigned int last_jiffy_time;
static int ep93xx_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
__raw_writel(1, EP93XX_TIMER1_CLEAR);
while ((signed long)
(__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time)
@ -109,8 +107,6 @@ static int ep93xx_timer_interrupt(int irq, void *dev_id)
timer_tick();
}
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-footbridge/dc21285-timer.c
View File

@ -30,14 +30,10 @@ static unsigned long timer1_gettimeoffset (void)
static irqreturn_t
timer1_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
*CSR_TIMER1_CLR = 0;
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

2
arch/arm/mach-footbridge/isa-timer.c
View File

@ -64,9 +64,7 @@ static unsigned long isa_gettimeoffset(void)
static irqreturn_t
isa_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-h720x/cpu-h7201.c
View File

@ -29,13 +29,9 @@
static irqreturn_t
h7201_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
CPU_REG (TIMER_VIRT, TIMER_TOPSTAT);
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

2
arch/arm/mach-h720x/cpu-h7202.c
View File

@ -113,9 +113,7 @@ h7202_timerx_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
mask = CPU_REG (TIMER_VIRT, TIMER_TOPSTAT);
if ( mask & TSTAT_T0INT ) {
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
if( mask == TSTAT_T0INT )
return;
}

4
arch/arm/mach-integrator/core.c
View File

@ -250,8 +250,6 @@ unsigned long integrator_gettimeoffset(void)
static irqreturn_t
integrator_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
/*
* clear the interrupt
*/
@ -259,8 +257,6 @@ integrator_timer_interrupt(int irq, void *dev_id)
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-ixp2000/core.c
View File

@ -206,8 +206,6 @@ unsigned long ixp2000_gettimeoffset (void)
static int ixp2000_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
/* clear timer 1 */
ixp2000_reg_wrb(IXP2000_T1_CLR, 1);
@ -217,8 +215,6 @@ static int ixp2000_timer_interrupt(int irq, void *dev_id)
next_jiffy_time -= ticks_per_jiffy;
}
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

3
arch/arm/mach-ks8695/time.c
View File

@ -70,10 +70,7 @@ static unsigned long ks8695_gettimeoffset (void)
*/
static irqreturn_t ks8695_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-lh7a40x/time.c
View File

@ -41,13 +41,9 @@
static irqreturn_t
lh7a40x_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
TIMER_EOI = 0;
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-mx3/time.c
View File

@ -45,8 +45,6 @@ static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
{
unsigned int next_match;
write_seqlock(&xtime_lock);
if (__raw_readl(MXC_GPT_GPTSR) & GPTSR_OF1) {
do {
timer_tick();
@ -57,8 +55,6 @@ static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
__raw_readl(MXC_GPT_GPTCNT)) <= 0);
}
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-netx/time.c
View File

@ -33,12 +33,8 @@
static irqreturn_t
netx_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
/* acknowledge interrupt */
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);

4
arch/arm/mach-omap2/timer-gp.c
View File

@ -40,13 +40,9 @@ static inline void omap2_gp_timer_start(unsigned long load_val)
static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
omap_dm_timer_write_status(gptimer, OMAP_TIMER_INT_OVERFLOW);
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-pnx4008/time.c
View File

@ -51,8 +51,6 @@ static irqreturn_t pnx4008_timer_interrupt(int irq, void *dev_id)
{
if (__raw_readl(HSTIM_INT) & MATCH0_INT) {
write_seqlock(&xtime_lock);
do {
timer_tick();
@ -73,8 +71,6 @@ static irqreturn_t pnx4008_timer_interrupt(int irq, void *dev_id)
} while ((signed)
(__raw_readl(HSTIM_MATCH0) -
__raw_readl(HSTIM_COUNTER)) < 0);
write_sequnlock(&xtime_lock);
}
return IRQ_HANDLED;

4
arch/arm/mach-realview/core.c
View File

@ -530,8 +530,6 @@ static unsigned long realview_gettimeoffset(void)
*/
static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
// ...clear the interrupt
writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
@ -542,8 +540,6 @@ static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
update_process_times(user_mode(get_irq_regs()));
#endif
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

4
arch/arm/mach-sa1100/time.c
View File

@ -62,8 +62,6 @@ sa1100_timer_interrupt(int irq, void *dev_id)
{
unsigned int next_match;
write_seqlock(&xtime_lock);
#ifdef CONFIG_NO_IDLE_HZ
if (match_posponed) {
match_posponed = 0;
@ -85,8 +83,6 @@ sa1100_timer_interrupt(int irq, void *dev_id)
next_match = (OSMR0 += LATCH);
} while ((signed long)(next_match - OSCR) <= 0);
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}

2
arch/arm/mach-shark/core.c
View File

@ -82,9 +82,7 @@ static void __init shark_map_io(void)
static irqreturn_t
shark_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}