src/patches/suse-2.6.27.39/patches.arch/s390-03-03-dasd_unsolicited_interrupt.patch

   1 From: Gerald Schaefer <geraldsc@de.ibm.com>
   2 Subject: dasd: fix  message flood for unsolicited interrupts
   3 References: bnc#440610
   4
   5 Symptom:     The message log is flooded with messages for unsolicited
   6              interrupts and missing sense data.
   7 Problem:     CIO generates fake IRBs which are falsly interpreted as
   8              unsolicited interrupts.
   9 Solution:    ignore fake IRBs
  10
  11 Acked-by: John Jolly <jjolly@suse.de>
  12 ---
  13  drivers/s390/block/dasd_eckd.c |   25 ++++++++++++++++++++-----
  14  1 file changed, 20 insertions(+), 5 deletions(-)
  15
  16 Index: linux-sles11/drivers/s390/block/dasd_eckd.c
  17 ===================================================================
  18 --- linux-sles11.orig/drivers/s390/block/dasd_eckd.c
  19 +++ linux-sles11/drivers/s390/block/dasd_eckd.c
  20 @@ -1501,12 +1501,27 @@ static void dasd_eckd_handle_unsolicited
  21                 return;
  22         }
  23
  24 -       /* just report other unsolicited interrupts */
  25 -       DEV_MESSAGE(KERN_DEBUG, device, "%s",
  26 -                   "unsolicited interrupt received");
  27 -       device->discipline->dump_sense(device, NULL, irb);
  28 -       dasd_schedule_device_bh(device);
  29 +       if ((irb->scsw.cmd.cc == 1) &&
  30 +           (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
  31 +           (irb->scsw.cmd.actl & SCSW_ACTL_START_PEND) &&
  32 +           (irb->scsw.cmd.stctl & SCSW_STCTL_STATUS_PEND)) {
  33 +               /* fake irb do nothing, they are handled elsewhere */
  34 +               dasd_schedule_device_bh(device);
  35 +               return;
  36 +       }
  37
  38 +       if (!(irb->esw.esw0.erw.cons)) {
  39 +               /* just report other unsolicited interrupts */
  40 +               DEV_MESSAGE(KERN_ERR, device, "%s",
  41 +                           "unsolicited interrupt received");
  42 +       } else {
  43 +               DEV_MESSAGE(KERN_ERR, device, "%s",
  44 +                           "unsolicited interrupt received "
  45 +                           "(sense available)");
  46 +               device->discipline->dump_sense(device, NULL, irb);
  47 +       }
  48 +
  49 +       dasd_schedule_device_bh(device);
  50         return;
  51  };
  52