[SCSI] allow sleeping in ->eh_host_reset_handler()

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

Documentation/scsi/scsi_mid_low_api.txt

@@ -990,8 +990,7 @@ 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/fc4/fc.c

@@ -1005,13 +1005,7 @@ int fcp_scsi_dev_reset(Scsi_Cmnd *SCpnt)
 	return SUCCESS;
 }
 
-int fcp_scsi_bus_reset(Scsi_Cmnd *SCpnt)
-{
-	printk ("FC: bus reset!\n");
-	return FAILED;
-}
-
-int fcp_scsi_host_reset(Scsi_Cmnd *SCpnt)
+static int __fcp_scsi_host_reset(Scsi_Cmnd *SCpnt)
 {
 	fc_channel *fc = FC_SCMND(SCpnt);
 	fcp_cmnd *fcmd = FCP_CMND(SCpnt);
@@ -1032,6 +1026,17 @@ int fcp_scsi_host_reset(Scsi_Cmnd *SCpnt)
 	else return FAILED;
 }
 
+int fcp_scsi_host_reset(Scsi_Cmnd *SCpnt)
+{
+	int rc;
+
+	spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
+	rc = __fcp_scsi_host_reset(SCpnt);
+	spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
+
+	return rc;
+}
+
 static int fcp_els_queue_it(fc_channel *fc, fcp_cmnd *fcmd)
 {
 	long i;

drivers/fc4/fc_syms.c

@@ -27,7 +27,6 @@ EXPORT_SYMBOL(fc_do_prli);
 EXPORT_SYMBOL(fcp_scsi_queuecommand);
 EXPORT_SYMBOL(fcp_scsi_abort);
 EXPORT_SYMBOL(fcp_scsi_dev_reset);
-EXPORT_SYMBOL(fcp_scsi_bus_reset);
 EXPORT_SYMBOL(fcp_scsi_host_reset);
 
 #endif /* CONFIG_MODULES */

drivers/fc4/fcp_impl.h

@@ -158,7 +158,6 @@ int fc_do_prli(fc_channel *, unsigned char);
 int fcp_scsi_queuecommand(Scsi_Cmnd *, void (* done)(Scsi_Cmnd *));
 int fcp_scsi_abort(Scsi_Cmnd *);
 int fcp_scsi_dev_reset(Scsi_Cmnd *);
-int fcp_scsi_bus_reset(Scsi_Cmnd *);
 int fcp_scsi_host_reset(Scsi_Cmnd *);
 
 #endif /* !(_FCP_SCSI_H) */

drivers/message/fusion/mptscsih.c

@@ -1899,7 +1899,6 @@ mptscsih_host_reset(struct scsi_cmnd *SCpnt)
 {
 	MPT_SCSI_HOST *  hd;
 	int              status = SUCCESS;
-	spinlock_t	*host_lock = SCpnt->device->host->host_lock;
 
 	/*  If we can't locate the host to reset, then we failed. */
 	if ((hd = (MPT_SCSI_HOST *) SCpnt->device->host->hostdata) == NULL){
@@ -1915,7 +1914,6 @@ mptscsih_host_reset(struct scsi_cmnd *SCpnt)
 	/*  If our attempts to reset the host failed, then return a failed
 	 *  status.  The host will be taken off line by the SCSI mid-layer.
 	 */
-	spin_unlock_irq(host_lock);
 	if (mpt_HardResetHandler(hd->ioc, CAN_SLEEP) < 0){
 		status = FAILED;
 	} else {
@@ -1925,8 +1923,6 @@ mptscsih_host_reset(struct scsi_cmnd *SCpnt)
 		hd->tmPending = 0;
 		hd->tmState = TM_STATE_NONE;
 	}
-	spin_lock_irq(host_lock);
-
 
 	dtmprintk( ( KERN_WARNING MYNAM ": mptscsih_host_reset: "
 		     "Status = %s\n",

drivers/s390/scsi/zfcp_scsi.c

@@ -755,8 +755,6 @@ zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 	struct zfcp_unit *unit;
 	struct Scsi_Host *scsi_host = scpnt->device->host;
 
-	spin_unlock_irq(scsi_host->host_lock);
-
 	unit = (struct zfcp_unit *) scpnt->device->hostdata;
 	ZFCP_LOG_NORMAL("host reset because of problems with "
 			"unit 0x%016Lx\n", unit->fcp_lun);
@@ -764,7 +762,6 @@ zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 	zfcp_erp_wait(unit->port->adapter);
 	retval = SUCCESS;
 
-	spin_lock_irq(scsi_host->host_lock);
 	return retval;
 }
 

drivers/scsi/3w-9xxx.c

@@ -1695,8 +1695,6 @@ static int twa_scsi_eh_reset(struct scsi_cmnd *SCpnt)
 
 	tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;
 
-	spin_unlock_irq(tw_dev->host->host_lock);
-
 	tw_dev->num_resets++;
 
 	printk(KERN_WARNING "3w-9xxx: scsi%d: WARNING: (0x%02X:0x%04X): Unit #%d: Command (0x%x) timed out, resetting card.\n", tw_dev->host->host_no, TW_DRIVER, 0x2c, SCpnt->device->id, SCpnt->cmnd[0]);
@@ -1709,7 +1707,6 @@ static int twa_scsi_eh_reset(struct scsi_cmnd *SCpnt)
 
 	retval = SUCCESS;
 out:
-	spin_lock_irq(tw_dev->host->host_lock);
 	return retval;
 } /* End twa_scsi_eh_reset() */
 

drivers/scsi/3w-xxxx.c

@@ -1430,8 +1430,6 @@ static int tw_scsi_eh_reset(struct scsi_cmnd *SCpnt)
 
 	tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;
 
-	spin_unlock_irq(tw_dev->host->host_lock);
-
 	tw_dev->num_resets++;
 
 	printk(KERN_WARNING "3w-xxxx: scsi%d: WARNING: Unit #%d: Command (0x%x) timed out, resetting card.\n", tw_dev->host->host_no, SCpnt->device->id, SCpnt->cmnd[0]);
@@ -1444,7 +1442,6 @@ static int tw_scsi_eh_reset(struct scsi_cmnd *SCpnt)
 
 	retval = SUCCESS;
 out:
-	spin_lock_irq(tw_dev->host->host_lock);
 	return retval;
 } /* End tw_scsi_eh_reset() */
 

drivers/scsi/53c700.c

@@ -1991,8 +1991,13 @@ NCR_700_host_reset(struct scsi_cmnd * SCp)
 	       SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
 	scsi_print_command(SCp);
 
+	spin_lock_irq(SCp->device->host->host_lock);
+
 	NCR_700_internal_bus_reset(SCp->device->host);
 	NCR_700_chip_reset(SCp->device->host);
+
+	spin_unlock_irq(SCp->device->host->host_lock);
+
 	return SUCCESS;
 }
 

drivers/scsi/BusLogic.c

@@ -2746,9 +2746,15 @@ static int BusLogic_host_reset(struct scsi_cmnd * SCpnt)
 
 	unsigned int id = SCpnt->device->id;
 	struct BusLogic_TargetStatistics *stats = &HostAdapter->TargetStatistics[id];
+	int rc;
+
+	spin_lock_irq(SCpnt->device->host->host_lock);
+
 	BusLogic_IncrementErrorCounter(&stats->HostAdapterResetsRequested);
 
-	return BusLogic_ResetHostAdapter(HostAdapter, false);
+	rc = BusLogic_ResetHostAdapter(HostAdapter, false);
+	spin_unlock_irq(SCpnt->device->host->host_lock);
+	return rc;
 }
 
 /*

drivers/scsi/NCR53c406a.c

@@ -725,6 +725,9 @@ static int NCR53c406a_queue(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 static int NCR53c406a_host_reset(Scsi_Cmnd * SCpnt)
 {
 	DEB(printk("NCR53c406a_reset called\n"));
+
+	spin_lock_irq(SCpnt->device->host->host_lock);
+
 	outb(C4_IMG, CONFIG4);	/* Select reg set 0 */
 	outb(CHIP_RESET, CMD_REG);
 	outb(SCSI_NOP, CMD_REG);	/* required after reset */
@@ -732,6 +735,9 @@ static int NCR53c406a_host_reset(Scsi_Cmnd * SCpnt)
 	chip_init();
 
 	rtrc(2);
+
+	spin_unlock_irq(SCpnt->device->host->host_lock);
+
 	return SUCCESS;
 }
 

drivers/scsi/a2091.c

@@ -222,6 +222,9 @@ static int a2091_bus_reset(Scsi_Cmnd *cmd)
 {
 	/* FIXME perform bus-specific reset */
 
+	/* FIXME 2: kill this function, and let midlayer fall back
+	   to the same action, calling wd33c93_host_reset() */
+
 	spin_lock_irq(cmd->device->host->host_lock);
 	wd33c93_host_reset(cmd);
 	spin_unlock_irq(cmd->device->host->host_lock);

drivers/scsi/a3000.c

@@ -208,6 +208,9 @@ fail_register:
 static int a3000_bus_reset(Scsi_Cmnd *cmd)
 {
 	/* FIXME perform bus-specific reset */
+	
+	/* FIXME 2: kill this entire function, which should
+	   cause mid-layer to call wd33c93_host_reset anyway? */
 
 	spin_lock_irq(cmd->device->host->host_lock);
 	wd33c93_host_reset(cmd);

drivers/scsi/aacraid/linit.c

@@ -384,10 +384,13 @@ static int aac_eh_reset(struct scsi_cmnd* cmd)
 					AAC_DRIVERNAME);
 
 
+	spin_lock_irq(host->host_lock);
+
 	aac = (struct aac_dev *)host->hostdata;
 	if (aac_adapter_check_health(aac)) {
 		printk(KERN_ERR "%s: Host adapter appears dead\n", 
 				AAC_DRIVERNAME);
+		spin_unlock_irq(host->host_lock);
 		return -ENODEV;
 	}
 	/*
@@ -418,6 +421,7 @@ static int aac_eh_reset(struct scsi_cmnd* cmd)
 		ssleep(1);
 		spin_lock_irq(host->host_lock);
 	}
+	spin_unlock_irq(host->host_lock);
 	printk(KERN_ERR "%s: SCSI bus appears hung\n", AAC_DRIVERNAME);
 	return -ETIMEDOUT;
 }

drivers/scsi/aha1542.c

@@ -1530,7 +1530,6 @@ static int aha1542_host_reset(Scsi_Cmnd * SCpnt)
 	 * check for timeout, and if we are doing something like this
 	 * we are pretty desperate anyways.
 	 */
-	spin_unlock_irq(SCpnt->device->host->host_lock);
 	ssleep(4);
 	spin_lock_irq(SCpnt->device->host->host_lock);
 
@@ -1574,9 +1573,11 @@ static int aha1542_host_reset(Scsi_Cmnd * SCpnt)
 		}
 	}
 
+	spin_unlock_irq(SCpnt->device->host->host_lock);
 	return SUCCESS;
 
 fail:
+	spin_unlock_irq(SCpnt->device->host->host_lock);
 	return FAILED;
 }
 

drivers/scsi/aic7xxx_old.c

@@ -10845,6 +10845,8 @@ aic7xxx_reset(Scsi_Cmnd *cmd)
   struct aic_dev_data *aic_dev;
 
   p = (struct aic7xxx_host *) cmd->device->host->hostdata;
+  spin_lock_irq(p->host->host_lock);
+
   aic_dev = AIC_DEV(cmd);
   if(aic7xxx_position(cmd) < p->scb_data->numscbs)
   {
@@ -10884,6 +10886,7 @@ aic7xxx_reset(Scsi_Cmnd *cmd)
      * longer have it.
      */
     unpause_sequencer(p, FALSE);
+    spin_unlock_irq(p->host->host_lock);
     return SUCCESS;
   }
     
@@ -10907,7 +10910,6 @@ aic7xxx_reset(Scsi_Cmnd *cmd)
   unpause_sequencer(p, FALSE);
   spin_unlock_irq(p->host->host_lock);
   ssleep(2);
-  spin_lock_irq(p->host->host_lock);
   return SUCCESS;
 }
 

drivers/scsi/arm/fas216.c

@@ -2659,6 +2659,8 @@ int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
 {
 	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
 
+	spin_lock_irq(info->host->host_lock);
+
 	fas216_checkmagic(info);
 
 	printk("scsi%d.%c: %s: resetting host\n",
@@ -2686,6 +2688,7 @@ int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
 
 	fas216_init_chip(info);
 
+	spin_unlock_irq(info->host->host_lock);
 	return SUCCESS;
 }
 

drivers/scsi/dpt_i2o.c

@@ -746,7 +746,7 @@ static int adpt_bus_reset(struct scsi_cmnd* cmd)
 }
 
 // This version of reset is called by the eh_error_handler
-static int adpt_reset(struct scsi_cmnd* cmd)
+static int __adpt_reset(struct scsi_cmnd* cmd)
 {
 	adpt_hba* pHba;
 	int rcode;
@@ -762,6 +762,17 @@ static int adpt_reset(struct scsi_cmnd* cmd)
 	}
 }
 
+static int adpt_reset(struct scsi_cmnd* cmd)
+{
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = __adpt_reset(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
+}
+
 // This version of reset is called by the ioctls and indirectly from eh_error_handler via adpt_reset
 static int adpt_hba_reset(adpt_hba* pHba)
 {

drivers/scsi/eata.c

@@ -1948,16 +1948,20 @@ static int eata2x_eh_host_reset(struct scsi_cmnd *SCarg)
 	       ha->board_name, SCarg->device->channel, SCarg->device->id,
 	       SCarg->device->lun, SCarg->pid);
 
+	spin_lock_irq(shost->host_lock);
+
 	if (SCarg->host_scribble == NULL)
 		printk("%s: reset, pid %ld inactive.\n", ha->board_name, SCarg->pid);
 
 	if (ha->in_reset) {
 		printk("%s: reset, exit, already in reset.\n", ha->board_name);
+		spin_unlock_irq(shost->host_lock);
 		return FAILED;
 	}
 
 	if (wait_on_busy(shost->io_port, MAXLOOP)) {
 		printk("%s: reset, exit, timeout error.\n", ha->board_name);
+		spin_unlock_irq(shost->host_lock);
 		return FAILED;
 	}
 
@@ -2012,6 +2016,7 @@ static int eata2x_eh_host_reset(struct scsi_cmnd *SCarg)
 
 	if (do_dma(shost->io_port, 0, RESET_PIO)) {
 		printk("%s: reset, cannot reset, timeout error.\n", ha->board_name);
+		spin_unlock_irq(shost->host_lock);
 		return FAILED;
 	}
 
@@ -2024,9 +2029,12 @@ static int eata2x_eh_host_reset(struct scsi_cmnd *SCarg)
 	ha->in_reset = 1;
 
 	spin_unlock_irq(shost->host_lock);
+
+	/* FIXME: use a sleep instead */
 	time = jiffies;
 	while ((jiffies - time) < (10 * HZ) && limit++ < 200000)
 		udelay(100L);
+
 	spin_lock_irq(shost->host_lock);
 
 	printk("%s: reset, interrupts disabled, loops %d.\n", ha->board_name, limit);
@@ -2076,6 +2084,7 @@ static int eata2x_eh_host_reset(struct scsi_cmnd *SCarg)
 	else
 		printk("%s: reset, exit.\n", ha->board_name);
 
+	spin_unlock_irq(shost->host_lock);
 	return SUCCESS;
 }
 

drivers/scsi/eata_pio.c

@@ -486,8 +486,11 @@ static int eata_pio_host_reset(struct scsi_cmnd *cmd)
 
 	DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset called pid:%ld target:" " %x lun: %x reason %x\n", cmd->pid, cmd->device->id, cmd->device->lun, cmd->abort_reason));
 
+	spin_lock_irq(host->host_lock);
+
 	if (HD(cmd)->state == RESET) {
 		printk(KERN_WARNING "eata_pio_reset: exit, already in reset.\n");
+		spin_unlock_irq(host->host_lock);
 		return FAILED;
 	}
 
@@ -536,6 +539,8 @@ static int eata_pio_host_reset(struct scsi_cmnd *cmd)
 
 	HD(cmd)->state = 0;
 
+	spin_unlock_irq(host->host_lock);
+
 	if (success) {		/* hmmm... */
 		DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: exit, success.\n"));
 		return SUCCESS;