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[SCSI] qla2xxx: Correct synchronization of software/firmware fcport states.

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Greg Wettstein (greg@enjellic.com) noted:

	http://article.gmane.org/gmane.linux.scsi/43409

on a reboot of a previously recognized SCST target, the initiator
driver would be unable to re-recognize the device as a target.
It turns out that prior to the SCST software reloading and
returning it's "target-capable" abilities in the PRLI payload,
the HBA would be re-initialized as an initiator-only type port.
Since initiators typically classify themselves as an FCP-2
capable device, both software and firmware do not perform an
explicit logout during port-loss.  Unfortunately, as can be seen
by the failure case, when the port (now target-capable) returns,
firmware performs an ADISC without a follow-on PRLI, leaving
stale 'initiator-only' data in the firmware's port database.

Correct the discrepancy by performing the explicit logout during
the transport's request to terminate-rport-io, thus synchronizing
port states and ensuring a follow-on PRLI is performed.

Reported-by: Greg Wettstein <greg@enjellic.com>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Andrew Vasquez 2008-08-13 21:36:56 -07:00 committed by James Bottomley
parent fe42625cdf
commit 6390d1f33f
1 changed files with 11 additions and 0 deletions
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11
drivers/scsi/qla2xxx/qla_attr.c
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@ -993,6 +993,17 @@ qla2x00_terminate_rport_io(struct fc_rport *rport)
{
fc_port_t *fcport = *(fc_port_t **)rport->dd_data;
/*
* At this point all fcport's software-states are cleared. Perform any
* final cleanup of firmware resources (PCBs and XCBs).
*/
if (fcport->loop_id != FC_NO_LOOP_ID) {
fcport->ha->isp_ops->fabric_logout(fcport->ha, fcport->loop_id,
fcport->d_id.b.domain, fcport->d_id.b.area,
fcport->d_id.b.al_pa);
fcport->loop_id = FC_NO_LOOP_ID;
}
qla2x00_abort_fcport_cmds(fcport);
scsi_target_unblock(&rport->dev);
}