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[SCSI] zfcp: Replace fsf_req wait_queue with completion
The combination wait_queue/wakeup in conjunction with the flag ZFCP_STATUS_FSFREQ_COMPLETED to signal the completion of an fsfreq was not race-safe and can be better solved by a completion. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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@ -248,7 +248,6 @@ enum zfcp_wka_status {
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/* FSF request status (this does not have a common part) */
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#define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT 0x00000002
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#define ZFCP_STATUS_FSFREQ_COMPLETED 0x00000004
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#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
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#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
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#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
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@ -532,7 +531,7 @@ struct zfcp_fsf_req {
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u8 sbale_curr; /* current SBALE during creation
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of request */
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u8 sbal_response; /* SBAL used in interrupt */
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wait_queue_head_t completion_wq; /* can be used by a routine
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struct completion completion; /* can be used by a routine
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to wait for completion */
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u32 status; /* status of this request */
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u32 fsf_command; /* FSF Command copy */
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@ -485,8 +485,7 @@ static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
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}
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if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
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zfcp_rec_dbf_event_action("erscf_2", act);
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if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
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ZFCP_STATUS_FSFREQ_DISMISSED))
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if (act->fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
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act->fsf_req = NULL;
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} else
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act->fsf_req = NULL;
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@ -444,23 +444,11 @@ static void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
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if (req->erp_action)
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zfcp_erp_notify(req->erp_action, 0);
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req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
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if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
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zfcp_fsf_req_free(req);
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else
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/* notify initiator waiting for the requests completion */
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/*
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* FIXME: Race! We must not access fsf_req here as it might have been
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* cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
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* flag. It's an improbable case. But, we have the same paranoia for
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* the cleanup flag already.
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* Might better be handled using complete()?
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* (setting the flag and doing wakeup ought to be atomic
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* with regard to checking the flag as long as waitqueue is
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* part of the to be released structure)
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*/
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wake_up(&req->completion_wq);
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complete(&req->completion);
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}
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/**
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@ -733,7 +721,7 @@ static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
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INIT_LIST_HEAD(&req->list);
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init_timer(&req->timer);
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init_waitqueue_head(&req->completion_wq);
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init_completion(&req->completion);
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req->adapter = adapter;
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req->fsf_command = fsf_cmd;
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@ -1309,8 +1297,7 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
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retval = zfcp_fsf_req_send(req);
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spin_unlock_bh(&adapter->req_q_lock);
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if (!retval)
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wait_event(req->completion_wq,
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req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
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wait_for_completion(&req->completion);
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zfcp_fsf_req_free(req);
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return retval;
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@ -1405,8 +1392,8 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
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spin_unlock_bh(&adapter->req_q_lock);
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if (!retval)
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wait_event(req->completion_wq,
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req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
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wait_for_completion(&req->completion);
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zfcp_fsf_req_free(req);
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return retval;
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@ -2572,8 +2559,7 @@ out:
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spin_unlock_bh(&adapter->req_q_lock);
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if (!retval) {
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wait_event(req->completion_wq,
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req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
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wait_for_completion(&req->completion);
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return req;
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}
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return ERR_PTR(retval);
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@ -206,8 +206,7 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
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if (!abrt_req)
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return FAILED;
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wait_event(abrt_req->completion_wq,
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abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
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wait_for_completion(&abrt_req->completion);
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if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
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dbf_tag = "okay";
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@ -246,8 +245,7 @@ static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
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if (!fsf_req)
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return FAILED;
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wait_event(fsf_req->completion_wq,
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fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
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wait_for_completion(&fsf_req->completion);
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
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zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
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