[ARM] Fix timer damage from d3d74453c34f8fd87674a8cf5b8a327c68f22e99

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>

2 files changed, 0 insertions, 6 deletions

diff --git a/arch/arm/mach-footbridge/dc21285-timer.c b/arch/arm/mach-footbridge/dc21285-timer.c
index 3a63941d43b..b2a21189dd8 100644
--- a/arch/arm/mach-footbridge/dc21285-timer.c
+++ b/arch/arm/mach-footbridge/dc21285-timer.c
@@ -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;
 }
 
diff --git a/arch/arm/mach-footbridge/isa-timer.c b/arch/arm/mach-footbridge/isa-timer.c
index d08d64139d0..a764e01d357 100644
--- a/arch/arm/mach-footbridge/isa-timer.c
+++ b/arch/arm/mach-footbridge/isa-timer.c
@@ -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;
 }