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[ARM] Fix timer damage from d3d74453c3

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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
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4
arch/arm/mach-realview/core.c
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@ -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;
}