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[SCSI] zfcp: No automatic port_rescan on events

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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>
This commit is contained in:
Steffen Maier
2012-09-04 15:23:35 +02:00
committed by James Bottomley
parent d99b601b63
commit 43f60cbd56
5 changed files with 32 additions and 4 deletions
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7
drivers/s390/scsi/zfcp_ccw.c
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@@ -57,7 +57,7 @@ static int zfcp_ccw_activate(struct ccw_device *cdev, int clear, char *tag)
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
tag);
zfcp_erp_wait(adapter);
flush_work(&adapter->scan_work);
flush_work(&adapter->scan_work); /* ok to call even if nothing queued */
zfcp_ccw_adapter_put(adapter);
@@ -171,6 +171,11 @@ static int zfcp_ccw_set_online(struct ccw_device *cdev)
adapter->req_no = 0;
zfcp_ccw_activate(cdev, 0, "ccsonl1");
/* scan for remote ports
either at the end of any successful adapter recovery
or only after the adapter recovery for setting a device online */
zfcp_fc_inverse_conditional_port_scan(adapter);
flush_work(&adapter->scan_work); /* ok to call even if nothing queued */
zfcp_ccw_adapter_put(adapter);
return 0;
}