[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>

1 files changed, 0 insertions, 4 deletions

diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
index fdf7b016e7ad..47f8640438e6 100644
--- a/arch/arm/mach-sa1100/time.c
+++ b/arch/arm/mach-sa1100/time.c
@@ -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;
 }