From 8fa728a26886f56a9ee10a44fea0ddda301d21c3 Mon Sep 17 00:00:00 2001
From: Jeff Garzik <jgarzik@pobox.com>
Date: Sat, 28 May 2005 07:54:40 -0400
Subject: [SCSI] allow sleeping in ->eh_abort_handler()

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt
index e41703d..f4a37ee 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/Documentation/scsi/scsi_mid_low_api.txt
@@ -936,8 +936,7 @@ Details:
  *
  *      Returns SUCCESS if command aborted else FAILED
  *
- *      Locks: struct Scsi_Host::host_lock held (with irqsave) on entry 
- *      and assumed to be held on return.
+ *      Locks: None held
  *
  *      Calling context: kernel thread
  *
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index c849203..6a5851c 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -1707,7 +1707,6 @@ mptscsih_abort(struct scsi_cmnd * SCpnt)
 	MPT_FRAME_HDR	*mf;
 	u32		 ctx2abort;
 	int		 scpnt_idx;
-	spinlock_t	*host_lock = SCpnt->device->host->host_lock;
 
 	/* If we can't locate our host adapter structure, return FAILED status.
 	 */
@@ -1755,7 +1754,6 @@ mptscsih_abort(struct scsi_cmnd * SCpnt)
 
 	hd->abortSCpnt = SCpnt;
 
-	spin_unlock_irq(host_lock);
 	if (mptscsih_TMHandler(hd, MPI_SCSITASKMGMT_TASKTYPE_ABORT_TASK,
 		SCpnt->device->channel, SCpnt->device->id, SCpnt->device->lun,
 		ctx2abort, 2 /* 2 second timeout */)
@@ -1772,8 +1770,6 @@ mptscsih_abort(struct scsi_cmnd * SCpnt)
 		hd->tmPending = 0;
 		hd->tmState = TM_STATE_NONE;
 
-		spin_lock_irq(host_lock);
-
 		/* Unmap the DMA buffers, if any. */
 		if (SCpnt->use_sg) {
 			pci_unmap_sg(ioc->pcidev, (struct scatterlist *) SCpnt->request_buffer,
@@ -1789,7 +1785,6 @@ mptscsih_abort(struct scsi_cmnd * SCpnt)
 		mpt_free_msg_frame(ioc, mf);
 		return FAILED;
 	}
-	spin_lock_irq(host_lock);
 	return SUCCESS;
 }
 
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index c6f69fc..6e44475 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -433,7 +433,7 @@ zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
  *		FAILED	- otherwise
  */
 int
-zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
+__zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 {
 	int retval = SUCCESS;
 	struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
@@ -611,6 +611,17 @@ zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 	return retval;
 }
 
+int
+zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
+{
+	int rc;
+	struct Scsi_Host *scsi_host = scpnt->device->host;
+	spin_lock_irq(scsi_host->host_lock);
+	rc = __zfcp_scsi_eh_abort_handler(scpnt);
+	spin_unlock_irq(scsi_host->host_lock);
+	return rc;
+}
+
 /*
  * function:	zfcp_scsi_eh_device_reset_handler
  *
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 550c992..7fc6c76 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -941,7 +941,7 @@ ahd_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
 	 */
 	cmd->scsi_done = scsi_done;
 
-	ahd_midlayer_entrypoint_lock(ahd, &flags);
+	ahd_lock(ahd, &flags);
 
 	/*
 	 * Close the race of a command that was in the process of
@@ -955,7 +955,7 @@ ahd_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
 		ahd_cmd_set_transaction_status(cmd, CAM_REQUEUE_REQ);
 		ahd_linux_queue_cmd_complete(ahd, cmd);
 		ahd_schedule_completeq(ahd);
-		ahd_midlayer_entrypoint_unlock(ahd, &flags);
+		ahd_unlock(ahd, &flags);
 		return (0);
 	}
 	dev = ahd_linux_get_device(ahd, cmd->device->channel,
@@ -965,7 +965,7 @@ ahd_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
 		ahd_cmd_set_transaction_status(cmd, CAM_RESRC_UNAVAIL);
 		ahd_linux_queue_cmd_complete(ahd, cmd);
 		ahd_schedule_completeq(ahd);
-		ahd_midlayer_entrypoint_unlock(ahd, &flags);
+		ahd_unlock(ahd, &flags);
 		printf("%s: aic79xx_linux_queue - Unable to allocate device!\n",
 		       ahd_name(ahd));
 		return (0);
@@ -979,7 +979,7 @@ ahd_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
 		dev->flags |= AHD_DEV_ON_RUN_LIST;
 		ahd_linux_run_device_queues(ahd);
 	}
-	ahd_midlayer_entrypoint_unlock(ahd, &flags);
+	ahd_unlock(ahd, &flags);
 	return (0);
 }
 
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index e389258..89f073a 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2249,6 +2249,8 @@ ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
 		printf(" 0x%x", cmd->cmnd[cdb_byte]);
 	printf("\n");
 
+	spin_lock_irq(&ahc->platform_data->spin_lock);
+
 	/*
 	 * First determine if we currently own this command.
 	 * Start by searching the device queue.  If not found
@@ -2503,6 +2505,8 @@ done:
 		}
 		spin_lock_irq(&ahc->platform_data->spin_lock);
 	}
+
+	spin_unlock_irq(&ahc->platform_data->spin_lock);
 	return (retval);
 }
 
diff --git a/drivers/scsi/aic7xxx_old.c b/drivers/scsi/aic7xxx_old.c
index 9e9d0c4..ee127e8 100644
--- a/drivers/scsi/aic7xxx_old.c
+++ b/drivers/scsi/aic7xxx_old.c
@@ -10585,7 +10585,7 @@ aic7xxx_panic_abort(struct aic7xxx_host *p, Scsi_Cmnd *cmd)
  *   Abort the current SCSI command(s).
  *-F*************************************************************************/
 static int
-aic7xxx_abort(Scsi_Cmnd *cmd)
+__aic7xxx_abort(Scsi_Cmnd *cmd)
 {
   struct aic7xxx_scb  *scb = NULL;
   struct aic7xxx_host *p;
@@ -10802,6 +10802,19 @@ success:
   return SUCCESS;
 }
 
+static int
+aic7xxx_abort(Scsi_Cmnd *cmd)
+{
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = __aic7xxx_abort(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
+}
+
+
 /*+F*************************************************************************
  * Function:
  *   aic7xxx_reset
diff --git a/drivers/scsi/ibmmca.c b/drivers/scsi/ibmmca.c
index a3fdead..0018fb5 100644
--- a/drivers/scsi/ibmmca.c
+++ b/drivers/scsi/ibmmca.c
@@ -2118,7 +2118,7 @@ static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
 	return 0;
 }
 
-static int ibmmca_abort(Scsi_Cmnd * cmd)
+static int __ibmmca_abort(Scsi_Cmnd * cmd)
 {
 	/* Abort does not work, as the adapter never generates an interrupt on
 	 * whatever situation is simulated, even when really pending commands
@@ -2225,6 +2225,18 @@ static int ibmmca_abort(Scsi_Cmnd * cmd)
 	}
 }
 
+static int ibmmca_abort(Scsi_Cmnd * cmd)
+{
+	struct Scsi_Host *shpnt = cmd->device->host;
+	int rc;
+
+	spin_lock_irq(shpnt->host_lock);
+	rc = __ibmmca_abort(cmd);
+	spin_unlock_irq(shpnt->host_lock);
+
+	return rc;
+}
+
 static int ibmmca_host_reset(Scsi_Cmnd * cmd)
 {
 	struct Scsi_Host *shpnt;
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index e89f76e..d857842 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -874,9 +874,7 @@ static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
 		return FAILED;
 	}
 
-	spin_unlock_irq(hostdata->host->host_lock);
 	wait_for_completion(&evt->comp);
-	spin_lock_irq(hostdata->host->host_lock);
 
 	/* make sure we got a good response */
 	if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
diff --git a/drivers/scsi/in2000.c b/drivers/scsi/in2000.c
index e1fe6f1..fbb29f7 100644
--- a/drivers/scsi/in2000.c
+++ b/drivers/scsi/in2000.c
@@ -1671,7 +1671,7 @@ static int in2000_bus_reset(Scsi_Cmnd * cmd)
 	return SUCCESS;
 }
 
-static int in2000_abort(Scsi_Cmnd * cmd)
+static int __in2000_abort(Scsi_Cmnd * cmd)
 {
 	struct Scsi_Host *instance;
 	struct IN2000_hostdata *hostdata;
@@ -1792,6 +1792,16 @@ static int in2000_abort(Scsi_Cmnd * cmd)
 	return SUCCESS;
 }
 
+static int in2000_abort(Scsi_Cmnd * cmd)
+{
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = __in2000_abort(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
+}
 
 
 #define MAX_IN2000_HOSTS 3
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index a3d9cf6..f9c01a1 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -3068,6 +3068,12 @@ static int ipr_cancel_op(struct scsi_cmnd * scsi_cmd)
 	ioa_cfg = (struct ipr_ioa_cfg *)scsi_cmd->device->host->hostdata;
 	res = scsi_cmd->device->hostdata;
 
+	/* If we are currently going through reset/reload, return failed.
+	 * This will force the mid-layer to call ipr_eh_host_reset,
+	 * which will then go to sleep and wait for the reset to complete
+	 */
+	if (ioa_cfg->in_reset_reload || ioa_cfg->ioa_is_dead)
+		return FAILED;
 	if (!res || (!ipr_is_gscsi(res) && !ipr_is_vset_device(res)))
 		return FAILED;
 
@@ -3118,23 +3124,17 @@ static int ipr_cancel_op(struct scsi_cmnd * scsi_cmd)
  **/
 static int ipr_eh_abort(struct scsi_cmnd * scsi_cmd)
 {
-	struct ipr_ioa_cfg *ioa_cfg;
+	unsigned long flags;
+	int rc;
 
 	ENTER;
-	ioa_cfg = (struct ipr_ioa_cfg *) scsi_cmd->device->host->hostdata;
 
-	/* If we are currently going through reset/reload, return failed. This will force the
-	   mid-layer to call ipr_eh_host_reset, which will then go to sleep and wait for the
-	   reset to complete */
-	if (ioa_cfg->in_reset_reload)
-		return FAILED;
-	if (ioa_cfg->ioa_is_dead)
-		return FAILED;
-	if (!scsi_cmd->device->hostdata)
-		return FAILED;
+	spin_lock_irqsave(scsi_cmd->device->host->host_lock, flags);
+	rc = ipr_cancel_op(scsi_cmd);
+	spin_unlock_irqrestore(scsi_cmd->device->host->host_lock, flags);
 
 	LEAVE;
-	return ipr_cancel_op(scsi_cmd);
+	return rc;
 }
 
 /**
diff --git a/drivers/scsi/ips.c b/drivers/scsi/ips.c
index fbc2cb6..6572e10 100644
--- a/drivers/scsi/ips.c
+++ b/drivers/scsi/ips.c
@@ -819,12 +819,15 @@ ips_eh_abort(Scsi_Cmnd * SC)
 	ips_ha_t *ha;
 	ips_copp_wait_item_t *item;
 	int ret;
+	unsigned long cpu_flags;
+	struct Scsi_Host *host;
 
 	METHOD_TRACE("ips_eh_abort", 1);
 
 	if (!SC)
 		return (FAILED);
 
+	host = SC->device->host;
 	ha = (ips_ha_t *) SC->device->host->hostdata;
 
 	if (!ha)
@@ -833,6 +836,8 @@ ips_eh_abort(Scsi_Cmnd * SC)
 	if (!ha->active)
 		return (FAILED);
 
+	IPS_LOCK_SAVE(host->host_lock, cpu_flags);
+
 	/* See if the command is on the copp queue */
 	item = ha->copp_waitlist.head;
 	while ((item) && (item->scsi_cmd != SC))
@@ -851,6 +856,8 @@ ips_eh_abort(Scsi_Cmnd * SC)
 		/* command must have already been sent */
 		ret = (FAILED);
 	}
+
+	IPS_UNLOCK_RESTORE(host->host_lock, cpu_flags);
 	return ret;
 }
 
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 42fab03..e9b84f9 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -798,7 +798,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 }
 
 static int
-lpfc_abort_handler(struct scsi_cmnd *cmnd)
+__lpfc_abort_handler(struct scsi_cmnd *cmnd)
 {
 	struct lpfc_hba *phba =
 			(struct lpfc_hba *)cmnd->device->host->hostdata[0];
@@ -918,6 +918,16 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
 }
 
 static int
+lpfc_abort_handler(struct scsi_cmnd *cmnd)
+{
+	int rc;
+	spin_lock_irq(cmnd->device->host->host_lock);
+	rc = __lpfc_abort_handler(cmnd);
+	spin_unlock_irq(cmnd->device->host->host_lock);
+	return rc;
+}
+
+static int
 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 {
 	struct Scsi_Host *shost = cmnd->device->host;
diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index 7876873..bec4406 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -2566,7 +2566,7 @@ megaraid_mbox_dpc(unsigned long devp)
  * aborted. All the commands issued to the F/W must complete.
  **/
 static int
-megaraid_abort_handler(struct scsi_cmnd *scp)
+__megaraid_abort_handler(struct scsi_cmnd *scp)
 {
 	adapter_t		*adapter;
 	mraid_device_t		*raid_dev;
@@ -2699,6 +2699,21 @@ megaraid_abort_handler(struct scsi_cmnd *scp)
 	return FAILED;
 }
 
+static int
+megaraid_abort_handler(struct scsi_cmnd *scp)
+{
+	adapter_t	*adapter;
+	int rc;
+
+	adapter		= SCP2ADAPTER(scp);
+
+	spin_lock_irq(adapter->host_lock);
+	rc = __megaraid_abort_handler(scp);
+	spin_unlock_irq(adapter->host_lock);
+
+	return rc;
+}
+
 
 /**
  * megaraid_reset_handler - device reset hadler for mailbox based driver
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 653e589..638be81 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -1098,7 +1098,13 @@ qla1280_error_action(struct scsi_cmnd *cmd, enum action action)
 static int
 qla1280_eh_abort(struct scsi_cmnd * cmd)
 {
-	return qla1280_error_action(cmd, ABORT_COMMAND);
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = qla1280_error_action(cmd, ABORT_COMMAND);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
 }
 
 /**************************************************************************
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 7f8d747..1693998 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -476,7 +476,6 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd)
 	serial = cmd->serial_number;
 
 	/* Check active list for command command. */
-	spin_unlock_irq(ha->host->host_lock);
 	spin_lock(&ha->hardware_lock);
 	for (i = 1; i < MAX_OUTSTANDING_COMMANDS; i++) {
 		sp = ha->outstanding_cmds[i];
@@ -516,7 +515,6 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd)
 		}
 		spin_lock(&ha->hardware_lock);
 	}
-	spin_lock_irq(ha->host->host_lock);
 
 	qla_printk(KERN_INFO, ha, 
 	    "scsi(%ld:%d:%d): Abort command issued -- %lx %x.\n", ha->host_no,
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 113c02d..3877a78 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -526,10 +526,8 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
 		 * abort a timed out command or not.  not sure how
 		 * we should treat them differently anyways.
 		 */
-		spin_lock_irqsave(shost->host_lock, flags);
 		if (shost->hostt->eh_abort_handler)
 			shost->hostt->eh_abort_handler(scmd);
-		spin_unlock_irqrestore(shost->host_lock, flags);
 			
 		scmd->request->rq_status = RQ_SCSI_DONE;
 		scmd->owner = SCSI_OWNER_ERROR_HANDLER;
@@ -735,11 +733,8 @@ static int scsi_eh_get_sense(struct list_head *work_q,
  **/
 static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
 {
-	unsigned long flags;
-	int rtn = FAILED;
-
 	if (!scmd->device->host->hostt->eh_abort_handler)
-		return rtn;
+		return FAILED;
 
 	/*
 	 * scsi_done was called just after the command timed out and before
@@ -750,11 +745,7 @@ static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
 
 	scmd->owner = SCSI_OWNER_LOWLEVEL;
 
-	spin_lock_irqsave(scmd->device->host->host_lock, flags);
-	rtn = scmd->device->host->hostt->eh_abort_handler(scmd);
-	spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
-
-	return rtn;
+	return scmd->device->host->hostt->eh_abort_handler(scmd);
 }
 
 /**
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index be58ffd..e2d055e 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -856,7 +856,13 @@ prepare:
  */
 static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
 {
-	return sym_eh_handler(SYM_EH_ABORT, "ABORT", cmd);
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = sym_eh_handler(SYM_EH_ABORT, "ABORT", cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
 }
 
 static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
diff --git a/drivers/scsi/ultrastor.c b/drivers/scsi/ultrastor.c
index 2c17470..486551b 100644
--- a/drivers/scsi/ultrastor.c
+++ b/drivers/scsi/ultrastor.c
@@ -879,7 +879,7 @@ static int ultrastor_abort(Scsi_Cmnd *SCpnt)
 	ogm_addr = (unsigned int)isa_bus_to_virt(inl(port0 + 23));
 	icm_status = inb(port0 + 27);
 	icm_addr = (unsigned int)isa_bus_to_virt(inl(port0 + 28));
-	spin_lock_irqsave(host->host_lock, flags);
+	spin_unlock_irqrestore(host->host_lock, flags);
       }
 
     /* First check to see if an interrupt is pending.  I suspect the SiS
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 22e48a2..7dce9c0 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -233,13 +233,11 @@ static int command_abort(struct scsi_cmnd *srb)
 		set_bit(US_FLIDX_ABORTING, &us->flags);
 		usb_stor_stop_transport(us);
 	}
-	scsi_unlock(us_to_host(us));
 
 	/* Wait for the aborted command to finish */
 	wait_for_completion(&us->notify);
 
 	/* Reacquire the lock and allow USB transfers to resume */
-	scsi_lock(us_to_host(us));
 	clear_bit(US_FLIDX_ABORTING, &us->flags);
 	clear_bit(US_FLIDX_TIMED_OUT, &us->flags);
 	return SUCCESS;
-- 
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