[SCSI] allow sleeping in ->eh_device_reset_handler()

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

Documentation/scsi/scsi_mid_low_api.txt

@@ -973,8 +973,7 @@ 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
  *

drivers/ieee1394/sbp2.c

@@ -2615,7 +2615,7 @@ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
 /*
  * Called by scsi stack when something has really gone wrong.
  */
-static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
+static int __sbp2scsi_reset(struct scsi_cmnd *SCpnt)
 {
 	struct scsi_id_instance_data *scsi_id =
 		(struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0];
@@ -2630,6 +2630,18 @@ static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
 	return(SUCCESS);
 }
 
+static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
+{
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
+	rc = __sbp2scsi_reset(SCpnt);
+	spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
+
+	return rc;
+}
+
 static const char *sbp2scsi_info (struct Scsi_Host *host)
 {
         return "SCSI emulation for IEEE-1394 SBP-2 Devices";

drivers/message/fusion/mptscsih.c

@@ -1801,7 +1801,6 @@ int
 mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
 {
 	MPT_SCSI_HOST	*hd;
-	spinlock_t	*host_lock = SCpnt->device->host->host_lock;
 
 	/* If we can't locate our host adapter structure, return FAILED status.
 	 */
@@ -1818,7 +1817,6 @@ mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
 	printk(KERN_WARNING MYNAM ": %s: >> Attempting target reset! (sc=%p)\n",
 	       hd->ioc->name, SCpnt);
 
-	spin_unlock_irq(host_lock);
 	if (mptscsih_TMHandler(hd, MPI_SCSITASKMGMT_TASKTYPE_TARGET_RESET,
 		SCpnt->device->channel, SCpnt->device->id,
 		0, 0, 5 /* 5 second timeout */)
@@ -1830,12 +1828,10 @@ mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
 		 		hd->ioc->name, SCpnt);
 		hd->tmPending = 0;
 		hd->tmState = TM_STATE_NONE;
-		spin_lock_irq(host_lock);
 		return FAILED;
 	}
-	spin_lock_irq(host_lock);
-	return SUCCESS;
 
+	return SUCCESS;
 }
 
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

drivers/s390/scsi/zfcp_scsi.c

@@ -636,8 +636,6 @@ zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 	struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 	struct Scsi_Host *scsi_host = scpnt->device->host;
 
-	spin_unlock_irq(scsi_host->host_lock);
-
 	if (!unit) {
 		ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 		retval = SUCCESS;
@@ -680,7 +678,6 @@ zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 		retval = SUCCESS;
 	}
  out:
-	spin_lock_irq(scsi_host->host_lock);
 	return retval;
 }
 

drivers/scsi/aha152x.c

@@ -1225,8 +1225,6 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
 	}
 
 	DO_UNLOCK(flags);
-
-	spin_lock_irq(shpnt->host_lock);
 	return ret;
 }
 

drivers/scsi/aic7xxx/aic79xx_osm.c

@@ -1511,17 +1511,17 @@ ahd_linux_dev_reset(Scsi_Cmnd *cmd)
 		       ahd_name(ahd), cmd->device->channel, cmd->device->id,
 		       cmd->device->lun, cmd);
 #endif
-	ahd_midlayer_entrypoint_lock(ahd, &s);
+	ahd_lock(ahd, &s);
 
 	dev = ahd_linux_get_device(ahd, cmd->device->channel, cmd->device->id,
 				   cmd->device->lun, /*alloc*/FALSE);
 	if (dev == NULL) {
-		ahd_midlayer_entrypoint_unlock(ahd, &s);
+		ahd_unlock(ahd, &s);
 		kfree(recovery_cmd);
 		return (FAILED);
 	}
 	if ((scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX)) == NULL) {
-		ahd_midlayer_entrypoint_unlock(ahd, &s);
+		ahd_unlock(ahd, &s);
 		kfree(recovery_cmd);
 		return (FAILED);
 	}
@@ -1570,7 +1570,7 @@ ahd_linux_dev_reset(Scsi_Cmnd *cmd)
 	spin_lock_irq(&ahd->platform_data->spin_lock);
 	ahd_schedule_runq(ahd);
 	ahd_linux_run_complete_queue(ahd);
-	ahd_midlayer_entrypoint_unlock(ahd, &s);
+	ahd_unlock(ahd, &s);
 	printf("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
 	return (retval);
 }

drivers/scsi/aic7xxx_old.c

@@ -10358,7 +10358,7 @@ aic7xxx_queue(Scsi_Cmnd *cmd, void (*fn)(Scsi_Cmnd *))
  *   Returns an enumerated type that indicates the status of the operation.
  *-F*************************************************************************/
 static int
-aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
+__aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
 {
   struct aic7xxx_host  *p;
   struct aic7xxx_scb   *scb;
@@ -10551,6 +10551,18 @@ aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
     return SUCCESS;
 }
 
+static int
+aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
+{
+      int rc;
+
+      spin_lock_irq(cmd->device->host->host_lock);
+      rc = __aic7xxx_bus_device_reset(cmd);
+      spin_unlock_irq(cmd->device->host->host_lock);
+
+      return rc;
+}
+
 
 /*+F*************************************************************************
  * Function:

drivers/scsi/ibmvscsi/ibmvscsi.c

@@ -976,9 +976,7 @@ static int ibmvscsi_eh_device_reset_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)) {

drivers/scsi/ipr.c

@@ -2916,7 +2916,7 @@ static int ipr_eh_host_reset(struct scsi_cmnd * scsi_cmd)
  * Return value:
  *	SUCCESS / FAILED
  **/
-static int ipr_eh_dev_reset(struct scsi_cmnd * scsi_cmd)
+static int __ipr_eh_dev_reset(struct scsi_cmnd * scsi_cmd)
 {
 	struct ipr_cmnd *ipr_cmd;
 	struct ipr_ioa_cfg *ioa_cfg;
@@ -2970,6 +2970,17 @@ static int ipr_eh_dev_reset(struct scsi_cmnd * scsi_cmd)
 	return (IPR_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS);
 }
 
+static int ipr_eh_dev_reset(struct scsi_cmnd * cmd)
+{
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = __ipr_eh_dev_reset(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
+}
+
 /**
  * ipr_bus_reset_done - Op done function for bus reset.
  * @ipr_cmd:	ipr command struct

drivers/scsi/lpfc/lpfc_scsi.c

@@ -928,7 +928,7 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
 }
 
 static int
-lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
+__lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 {
 	struct Scsi_Host *shost = cmnd->device->host;
 	struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
@@ -1040,6 +1040,16 @@ lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 	return ret;
 }
 
+static int
+lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
+{
+	int rc;
+	spin_lock_irq(cmnd->device->host->host_lock);
+	rc = __lpfc_reset_lun_handler(cmnd);
+	spin_unlock_irq(cmnd->device->host->host_lock);
+	return rc;
+}
+
 /*
  * Note: midlayer calls this function with the host_lock held
  */

drivers/scsi/megaraid.c

@@ -1938,7 +1938,7 @@ megaraid_abort(Scsi_Cmnd *cmd)
 
 
 static int
-megaraid_reset(Scsi_Cmnd *cmd)
+__megaraid_reset(Scsi_Cmnd *cmd)
 {
 	adapter_t	*adapter;
 	megacmd_t	mc;
@@ -1972,6 +1972,18 @@ megaraid_reset(Scsi_Cmnd *cmd)
 	return rval;
 }
 
+static int
+megaraid_reset(Scsi_Cmnd *cmd)
+{
+	adapter = (adapter_t *)cmd->device->host->hostdata;
+	int rc;
+
+	spin_lock_irq(&adapter->lock);
+	rc = __megaraid_reset(cmd);
+	spin_unlock_irq(&adapter->lock);
+
+	return rc;
+}
 
 
 /**

drivers/scsi/megaraid/megaraid_mbox.c

@@ -2726,7 +2726,7 @@ megaraid_abort_handler(struct scsi_cmnd *scp)
  * host
  **/
 static int
-megaraid_reset_handler(struct scsi_cmnd *scp)
+__megaraid_reset_handler(struct scsi_cmnd *scp)
 {
 	adapter_t	*adapter;
 	scb_t		*scb;
@@ -2847,6 +2847,18 @@ megaraid_reset_handler(struct scsi_cmnd *scp)
 	return rval;
 }
 
+static int
+megaraid_reset_handler(struct scsi_cmnd *cmd)
+{
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = __megaraid_reset_handler(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
+}
+
 
 /*
  * START: internal commands library

drivers/scsi/qla1280.c

@@ -1114,7 +1114,13 @@ qla1280_eh_abort(struct scsi_cmnd * cmd)
 static int
 qla1280_eh_device_reset(struct scsi_cmnd *cmd)
 {
-	return qla1280_error_action(cmd, DEVICE_RESET);
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = qla1280_error_action(cmd, DEVICE_RESET);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
 }
 
 /**************************************************************************

drivers/scsi/qla2xxx/qla_os.c

@@ -613,12 +613,8 @@ qla2xxx_eh_device_reset(struct scsi_cmnd *cmd)
 	qla_printk(KERN_INFO, ha,
 	    "scsi(%ld:%d:%d): DEVICE RESET ISSUED.\n", ha->host_no, id, lun);
 
-	spin_unlock_irq(ha->host->host_lock);
-
-	if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS) {
-		spin_lock_irq(ha->host->host_lock);
+	if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
 		goto eh_dev_reset_done;
-	}
 
 	if (qla2x00_wait_for_loop_ready(ha) == QLA_SUCCESS) {
 		if (qla2x00_device_reset(ha, fcport) == 0)
@@ -669,8 +665,6 @@ qla2xxx_eh_device_reset(struct scsi_cmnd *cmd)
 	    "scsi(%ld:%d:%d): DEVICE RESET SUCCEEDED.\n", ha->host_no, id, lun);
 
 eh_dev_reset_done:
-	spin_lock_irq(ha->host->host_lock);
-
 	return ret;
 }
 

drivers/scsi/scsi_error.c

@@ -857,17 +857,14 @@ static int scsi_eh_abort_cmds(struct list_head *work_q,
  **/
 static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
 {
-	unsigned long flags;
-	int rtn = FAILED;
+	int rtn;
 
 	if (!scmd->device->host->hostt->eh_device_reset_handler)
-		return rtn;
+		return FAILED;
 
 	scmd->owner = SCSI_OWNER_LOWLEVEL;
 
-	spin_lock_irqsave(scmd->device->host->host_lock, flags);
 	rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
-	spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
 
 	if (rtn == SUCCESS) {
 		scmd->device->was_reset = 1;

drivers/scsi/sym53c8xx_2/sym_glue.c

@@ -867,7 +867,13 @@ static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
 
 static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
 {
-	return sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
 }
 
 static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)

drivers/usb/storage/scsiglue.c

@@ -253,8 +253,6 @@ static int device_reset(struct scsi_cmnd *srb)
 
 	US_DEBUGP("%s called\n", __FUNCTION__);
 
-	scsi_unlock(us_to_host(us));
-
 	/* lock the device pointers and do the reset */
 	down(&(us->dev_semaphore));
 	if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
@@ -264,8 +262,6 @@ static int device_reset(struct scsi_cmnd *srb)
 		result = us->transport_reset(us);
 	up(&(us->dev_semaphore));
 
-	/* lock the host for the return */
-	scsi_lock(us_to_host(us));
 	return result;
 }