s390/time: return with irqs disabled from psw_idle

Modify the psw_idle waiting logic in entry[64].S to return with
interrupts disabled. This avoids potential issues with udelay
and interrupt loops as interrupts are not reenabled after
clock comparator interrupts.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index c61b9fad43cc..57c87d7d7ede 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -44,7 +44,6 @@ static void __udelay_disabled(unsigned long long usecs)
         do {
                 set_clock_comparator(end);
                 vtime_stop_cpu();
-                local_irq_disable();
         } while (get_tod_clock() < end);
         lockdep_on();
         __ctl_load(cr0, 0, 0);
@@ -64,7 +63,6 @@ static void __udelay_enabled(unsigned long long usecs)
                         set_clock_comparator(end);
                 }
                 vtime_stop_cpu();
-                local_irq_disable();
                 if (clock_saved)
                         local_tick_enable(clock_saved);
         } while (get_tod_clock() < end);