src/patches/suse-2.6.27.31/patches.arch/s390-12-14-zfcp_port_reference_counting.patch

   1 From: Gerald Schaefer <geraldsc@de.ibm.com>
   2 Subject: zfcp: Fix port reference counting
   3 References: bnc#487755,LTC#52847
   4
   5 Symptom:     If this problem appears zfcp ports cannot
   6              be de-queued since it is checked for a
   7              zero refcount.
   8 Problem:     The port reference counting is wrong for
   9              existing zfcp ports when e.g. an adapter
  10              gets on-line again.
  11 Solution:    During port scanning the reference counting
  12              for existing ports should not be changed.
  13
  14 Acked-by: John Jolly <jjolly@suse.de>
  15 ---
  16  drivers/s390/scsi/zfcp_fc.c |    7 ++++---
  17  1 file changed, 4 insertions(+), 3 deletions(-)
  18
  19 Index: linux-sles11/drivers/s390/scsi/zfcp_fc.c
  20 ===================================================================
  21 --- linux-sles11.orig/drivers/s390/scsi/zfcp_fc.c
  22 +++ linux-sles11/drivers/s390/scsi/zfcp_fc.c
  23 @@ -535,6 +535,9 @@ static void zfcp_validate_port(struct zf
  24  {
  25         struct zfcp_adapter *adapter = port->adapter;
  26
  27 +       if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
  28 +               return;
  29 +
  30         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
  31
  32         if ((port->supported_classes != 0) ||
  33 @@ -595,10 +598,8 @@ static int zfcp_scan_eval_gpn_ft(struct
  34                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
  35                         continue;
  36                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
  37 -               if (port) {
  38 -                       zfcp_port_get(port);
  39 +               if (port)
  40                         continue;
  41 -               }
  42
  43                 port = zfcp_port_enqueue(adapter, acc->wwpn,
  44                                          ZFCP_STATUS_PORT_DID_DID |