[SCSI] zfcp: No automatic port_rescan on events

In FC fabrics with large zones, the automatic port_rescan on incoming ELS
and any adapter recovery can cause quite some traffic at the very same
time, especially if lots of Linux images share an HBA, which is common on
s390. This can cause trouble and failures. Fix this by making such port
rescans dependent on a user configurable module parameter.

The following unconditional automatic port rescans remain as is:
On setting an adapter online and
on manual user-triggered writes to the sysfs attribute port_rescan.

Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 6e2892e7c4be..9ffdc335429c 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -257,7 +257,7 @@ static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)
                         zfcp_cfdc_adapter_access_changed(adapter);
                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
-                        queue_work(adapter->work_queue, &adapter->scan_work);
+                        zfcp_fc_conditional_port_scan(adapter);
                 break;
         case FSF_STATUS_READ_CFDC_UPDATED:
                 zfcp_cfdc_adapter_access_changed(adapter);