src/patches/suse-2.6.27.39/patches.arch/s390-15-10-zcrypt-hrtimer-scheduling.patch

   1 From: Gerald Schaefer <geraldsc@de.ibm.com>
   2 Subject: zcrypt: fix z90crypt kernel modules causes 100% cpu usage
   3 References: bnc#518291,LTC#54925
   4
   5 Symptom:     100% cpu usage
   6 Problem:     ap_poll_timer expires permanently and is restarts
   7 Solution:    Only restart ap_poll_timer when it expires and do it in the
   8              future.
   9
  10 Acked-by: John Jolly <jjolly@suse.de>
  11 ---
  12 Index: linux-sles11/drivers/s390/crypto/ap_bus.c
  13 ===================================================================
  14 --- linux-sles11.orig/drivers/s390/crypto/ap_bus.c
  15 +++ linux-sles11/drivers/s390/crypto/ap_bus.c
  16 @@ -930,10 +930,16 @@ ap_config_timeout(unsigned long ptr)
  17   */
  18  static inline void ap_schedule_poll_timer(void)
  19  {
  20 +       ktime_t hr_time;
  21         if (hrtimer_is_queued(&ap_poll_timer))
  22                 return;
  23 -       hrtimer_start(&ap_poll_timer, ktime_set(0, poll_timeout),
  24 -                     HRTIMER_MODE_ABS);
  25 +
  26 +       if (ktime_to_ns(hrtimer_get_remaining(&ap_poll_timer)) <= 0) {
  27 +               hr_time = ktime_set(0, poll_timeout);
  28 +               hrtimer_forward_now(&ap_poll_timer, hr_time);
  29 +               hrtimer_restart(&ap_poll_timer);
  30 +       }
  31 +       return;
  32  }
  33
  34  /**