[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-ebsa110/core.c b/arch/arm/mach-ebsa110/core.c
index 8c1b5690dfe8..7710e14b5268 100644
--- a/arch/arm/mach-ebsa110/core.c
+++ b/arch/arm/mach-ebsa110/core.c
@@ -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;
 }