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[SCSI] zfcp: Fix port reference counting 

If this problem appears zfcp ports cannot be de-queued since it is
checked for a zero refcount. The port reference counting is wrong for
existing zfcp ports when e.g. an adapter gets on-line again. During
port scanning the reference counting for existing ports should not be
changed.

Signed-off-by: Martin Petermann <martin.petermann@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin Petermann 2009-04-17 15:08:13 +02:00 committed by James Bottomley
parent 7001f0c486
commit 6ab35c0713
1 changed files with 4 additions and 3 deletions
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7
drivers/s390/scsi/zfcp_fc.c
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@ -539,6 +539,9 @@ static void zfcp_validate_port(struct zfcp_port *port)
{
struct zfcp_adapter *adapter = port->adapter;
if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
return;
atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
if ((port->supported_classes != 0) ||
@ -599,10 +602,8 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
continue;
port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
if (port) {
zfcp_port_get(port);
if (port)
continue;
}
port = zfcp_port_enqueue(adapter, acc->wwpn,
ZFCP_STATUS_COMMON_NOESC, d_id);