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[SCSI] zfcp: Hold queue lock when checking port/unit handle for abort command

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We need to hold the queue-lock when checking whether we still have a valid
unit/port handle for the abort command, i.e whether we can issue this request
for this unit/port. If the error recovery is about to close this unit/port,
then it competes for the queue-lock. If the close request issued by the error
recovery wins, then it is guaranteed that this unit/port has been blocked for
other requests.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2007-12-20 12:30:24 +01:00 committed by James Bottomley
parent 8627533c11
commit 951f746fec
1 changed files with 8 additions and 13 deletions
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21
drivers/s390/scsi/zfcp_fsf.c
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@ -1116,6 +1116,10 @@ zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
goto out;
}
if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&unit->status)))
goto unit_blocked;
sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1131,22 +1135,13 @@ zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
if (retval) {
ZFCP_LOG_INFO("error: Failed to send abort command request "
"on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
zfcp_get_busid_by_adapter(adapter),
unit->port->wwpn, unit->fcp_lun);
if (!retval)
goto out;
unit_blocked:
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
goto out;
}
ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
"(adapter%s, port d_id=0x%06x, "
"unit x%016Lx, old_req_id=0x%lx)\n",
zfcp_get_busid_by_adapter(adapter),
unit->port->d_id,
unit->fcp_lun, old_req_id);
out:
write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
return fsf_req;