[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-h720x/cpu-h7201.c b/arch/arm/mach-h720x/cpu-h7201.c
index 9107b8e2ad6e..c2a431f482f0 100644
--- a/arch/arm/mach-h720x/cpu-h7201.c
+++ b/arch/arm/mach-h720x/cpu-h7201.c
@@ -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;
 }
 
diff --git a/arch/arm/mach-h720x/cpu-h7202.c b/arch/arm/mach-h720x/cpu-h7202.c
index 0a1a25fb8ba8..c627fa124eb3 100644
--- a/arch/arm/mach-h720x/cpu-h7202.c
+++ b/arch/arm/mach-h720x/cpu-h7202.c
@@ -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;
         }