src/patches/suse-2.6.27.25/patches.arch/s390-04-09-zfcp-host-busy-count-fix.patch

   1 From: Gerald Schaefer <geraldsc@de.ibm.com>
   2 Subject: zfcp: prevent double decrement on host_busy counter
   3 References: bnc#445100
   4
   5 Symptom:     SCSI host hangs
   6 Problem:     double finish triggerd for one request
   7 Solution:    respond, act according to SCSI_mid_low API
   8
   9 The zfcp_scsi_queuecommand was not acting according to the standard
  10 when respective unit was not available. In this case an -EBUSY was
  11 returned, which is not valid in itself, and in addition scsi_done
  12 was called. This combination is not allowed and was leading to a
  13 double finish of the request and therefor double decrement of the
  14 host_busy counter.
  15
  16 Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
  17 Acked-by: John Jolly <jjolly@suse.de>
  18 ---
  19  drivers/s390/scsi/zfcp_scsi.c |    2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 Index: linux-sles11/drivers/s390/scsi/zfcp_scsi.c
  23 ===================================================================
  24 --- linux-sles11.orig/drivers/s390/scsi/zfcp_scsi.c
  25 +++ linux-sles11/drivers/s390/scsi/zfcp_scsi.c
  26 @@ -90,7 +90,7 @@ static int zfcp_scsi_queuecommand(struct
  27         ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
  28                                              ZFCP_REQ_AUTO_CLEANUP);
  29         if (unlikely(ret == -EBUSY))
  30 -               zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  31 +               return SCSI_MLQUEUE_DEVICE_BUSY;
  32         else if (unlikely(ret < 0))
  33                 return SCSI_MLQUEUE_HOST_BUSY;
  34