[SCSI] allow sleeping in ->eh_host_reset_handler()

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

38 files changed, 177 insertions, 44 deletions

diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt
index 5a066afcc67..da176c95d0f 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/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
  *
diff --git a/drivers/fc4/fc.c b/drivers/fc4/fc.c
index cdea598d0c1..fbd9ff79b7b 100644
--- a/drivers/fc4/fc.c
+++ b/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;
diff --git a/drivers/fc4/fc_syms.c b/drivers/fc4/fc_syms.c
index 8bac2c45302..ed85dfcef69 100644
--- a/drivers/fc4/fc_syms.c
+++ b/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 */
diff --git a/drivers/fc4/fcp_impl.h b/drivers/fc4/fcp_impl.h
index e44d652a83d..c397c84bef6 100644
--- a/drivers/fc4/fcp_impl.h
+++ b/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) */
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index efae9be4537..48ff314cdfb 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/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",
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index ac5a5da434b..6965992ddbb 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index a2b18f5a4f9..34dbc37a79d 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/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() */
 
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index 48f9ece1cbd..b6dc576da43 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/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() */
 
diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index 47cf9bd55d9..d151af9a6f1 100644
--- a/drivers/scsi/53c700.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c
index 15e4b122d56..9d6040bfa06 100644
--- a/drivers/scsi/BusLogic.c
+++ b/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;
 }
 
 /*
diff --git a/drivers/scsi/NCR53c406a.c b/drivers/scsi/NCR53c406a.c
index 7c025b6cdd7..b2002ba6e2a 100644
--- a/drivers/scsi/NCR53c406a.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
index ce3c37610c5..f7a1751e892 100644
--- a/drivers/scsi/a2091.c
+++ b/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);
diff --git a/drivers/scsi/a3000.c b/drivers/scsi/a3000.c
index 92698f33559..306caf56f3d 100644
--- a/drivers/scsi/a3000.c
+++ b/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);
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index b48843402cf..f7e9c89c491 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/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;
 }
diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index f911b51e304..9ec4641a634 100644
--- a/drivers/scsi/aha1542.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/aic7xxx_old.c b/drivers/scsi/aic7xxx_old.c
index 1e83096bb91..fac091e7093 100644
--- a/drivers/scsi/aic7xxx_old.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
index 3838f88e1fe..4772fb317f3 100644
--- a/drivers/scsi/arm/fas216.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index 2fd728731d5..9cc0015b717 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/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)
 {
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index 8394529ba55..1bb8727eea3 100644
--- a/drivers/scsi/eata.c
+++ b/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;
 }
 
diff --git a/drivers/scsi/eata_pio.c b/drivers/scsi/eata_pio.c
index 0ee49dc50b8..04a06b71a5e 100644
--- a/drivers/scsi/eata_pio.c
+++ b/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;
diff --git a/drivers/scsi/gvp11.c b/drivers/scsi/gvp11.c
index 66990af1dc9..d12342fa819 100644
--- a/drivers/scsi/gvp11.c
+++ b/drivers/scsi/gvp11.c
@@ -346,6 +346,10 @@ static int gvp11_bus_reset(Scsi_Cmnd *cmd)
 {
 	/* FIXME perform bus-specific reset */
 
+	/* FIXME 2: shouldn't we no-op this function (return
+	   FAILED), and fall back to host reset function,
+	   wd33c93_host_reset ? */
+
 	spin_lock_irq(cmd->device->host->host_lock);
 	wd33c93_host_reset(cmd);
 	spin_unlock_irq(cmd->device->host->host_lock);
diff --git a/drivers/scsi/ibmmca.c b/drivers/scsi/ibmmca.c
index 0018fb5c09a..b5dc3535557 100644
--- a/drivers/scsi/ibmmca.c
+++ b/drivers/scsi/ibmmca.c
@@ -2237,7 +2237,7 @@ static int ibmmca_abort(Scsi_Cmnd * cmd)
 	return rc;
 }
 
-static int ibmmca_host_reset(Scsi_Cmnd * cmd)
+static int __ibmmca_host_reset(Scsi_Cmnd * cmd)
 {
 	struct Scsi_Host *shpnt;
 	Scsi_Cmnd *cmd_aid;
@@ -2324,6 +2324,18 @@ static int ibmmca_host_reset(Scsi_Cmnd * cmd)
 	return SUCCESS;
 }
 
+static int ibmmca_host_reset(Scsi_Cmnd * cmd)
+{
+	struct Scsi_Host *shpnt = cmd->device->host;
+	int rc;
+
+	spin_lock_irq(shpnt->host_lock);
+	rc = __ibmmca_host_reset(cmd);
+	spin_unlock_irq(shpnt->host_lock);
+
+	return rc;
+}
+
 static int ibmmca_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *info)
 {
 	int size = capacity;
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 83f062ed908..3d62c9bcbff 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -46,6 +46,7 @@
 #include <linux/slab.h>
 #include <linux/ide.h>
 #include <linux/scatterlist.h>
+#include <linux/delay.h>
 
 #include <asm/io.h>
 #include <asm/bitops.h>
@@ -1026,11 +1027,13 @@ static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 		return FAILED;
 	}
 
-	spin_lock_irq(&ide_lock);
+	spin_lock_irq(cmd->device->host->host_lock);
+	spin_lock(&ide_lock);
 
 	if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 		printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 		spin_unlock(&ide_lock);
+		spin_unlock_irq(cmd->device->host->host_lock);
 		return FAILED;
 	}
 
@@ -1052,16 +1055,15 @@ static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 	HWGROUP(drive)->rq = NULL;
 	HWGROUP(drive)->handler = NULL;
 	HWGROUP(drive)->busy = 1;		/* will set this to zero when ide reset finished */
-	spin_unlock_irq(&ide_lock);
+	spin_unlock(&ide_lock);
 
 	ide_do_reset(drive);
 
 	/* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 
 	do {
-		set_current_state(TASK_UNINTERRUPTIBLE);
 		spin_unlock_irq(cmd->device->host->host_lock);
-		schedule_timeout(HZ/20);
+		msleep(50);
 		spin_lock_irq(cmd->device->host->host_lock);
 	} while ( HWGROUP(drive)->handler );
 
@@ -1072,6 +1074,7 @@ static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 		ret = FAILED;
 	}
 
+	spin_unlock_irq(cmd->device->host->host_lock);
 	return ret;
 }
 
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index fd8af643fea..17b106b79f7 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -2885,7 +2885,7 @@ static int ipr_slave_alloc(struct scsi_device *sdev)
  * Return value:
  * 	SUCCESS / FAILED
  **/
-static int ipr_eh_host_reset(struct scsi_cmnd * scsi_cmd)
+static int __ipr_eh_host_reset(struct scsi_cmnd * scsi_cmd)
 {
 	struct ipr_ioa_cfg *ioa_cfg;
 	int rc;
@@ -2905,6 +2905,17 @@ static int ipr_eh_host_reset(struct scsi_cmnd * scsi_cmd)
 	return rc;
 }
 
+static int ipr_eh_host_reset(struct scsi_cmnd * cmd)
+{
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = __ipr_eh_host_reset(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
+}
+
 /**
  * ipr_eh_dev_reset - Reset the device
  * @scsi_cmd:	scsi command struct
diff --git a/drivers/scsi/ips.c b/drivers/scsi/ips.c
index 6572e100f7b..6dfcb4fbccd 100644
--- a/drivers/scsi/ips.c
+++ b/drivers/scsi/ips.c
@@ -873,7 +873,7 @@ ips_eh_abort(Scsi_Cmnd * SC)
 /*                                                                          */
 /****************************************************************************/
 static int
-ips_eh_reset(Scsi_Cmnd * SC)
+__ips_eh_reset(Scsi_Cmnd * SC)
 {
 	int ret;
 	int i;
@@ -1060,6 +1060,18 @@ ips_eh_reset(Scsi_Cmnd * SC)
 
 }
 
+static int
+ips_eh_reset(Scsi_Cmnd * SC)
+{
+	int rc;
+
+	spin_lock_irq(SC->device->host->host_lock);
+	rc = __ips_eh_reset(SC);
+	spin_unlock_irq(SC->device->host->host_lock);
+
+	return rc;
+}
+
 /****************************************************************************/
 /*                                                                          */
 /* Routine Name: ips_queue                                                  */
diff --git a/drivers/scsi/mac53c94.c b/drivers/scsi/mac53c94.c
index 9a792a5494b..edd47d1f0b1 100644
--- a/drivers/scsi/mac53c94.c
+++ b/drivers/scsi/mac53c94.c
@@ -103,6 +103,9 @@ static int mac53c94_host_reset(struct scsi_cmnd *cmd)
 	struct fsc_state *state = (struct fsc_state *) cmd->device->host->hostdata;
 	struct mac53c94_regs __iomem *regs = state->regs;
 	struct dbdma_regs __iomem *dma = state->dma;
+	unsigned long flags;
+
+	spin_lock_irqsave(cmd->device->host->host_lock, flags);
 
 	writel((RUN|PAUSE|FLUSH|WAKE) << 16, &dma->control);
 	writeb(CMD_SCSI_RESET, &regs->command);	/* assert RST */
@@ -111,6 +114,8 @@ static int mac53c94_host_reset(struct scsi_cmnd *cmd)
 	udelay(20);
 	mac53c94_init(state);
 	writeb(CMD_NOP, &regs->command);
+
+	spin_unlock_irqrestore(cmd->device->host->host_lock, flags);
 	return SUCCESS;
 }
 
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index f6da46d672f..b05737ae5ef 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -1715,9 +1715,12 @@ static int mesh_host_reset(struct scsi_cmnd *cmd)
 	struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
 	volatile struct mesh_regs __iomem *mr = ms->mesh;
 	volatile struct dbdma_regs __iomem *md = ms->dma;
+	unsigned long flags;
 
 	printk(KERN_DEBUG "mesh_host_reset\n");
 
+	spin_lock_irqsave(ms->host->host_lock, flags);
+
 	/* Reset the controller & dbdma channel */
 	out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16);	/* stop dma */
 	out_8(&mr->exception, 0xff);	/* clear all exception bits */
@@ -1739,6 +1742,7 @@ static int mesh_host_reset(struct scsi_cmnd *cmd)
 	/* Complete pending commands */
 	handle_reset(ms);
 	
+	spin_unlock_irqrestore(ms->host->host_lock, flags);
 	return SUCCESS;
 }
 
diff --git a/drivers/scsi/mvme147.c b/drivers/scsi/mvme147.c
index 5c42021189e..2fb31ee6d9f 100644
--- a/drivers/scsi/mvme147.c
+++ b/drivers/scsi/mvme147.c
@@ -117,6 +117,9 @@ static int mvme147_bus_reset(Scsi_Cmnd *cmd)
 {
 	/* FIXME perform bus-specific reset */
 
+	/* FIXME 2: kill this function, and let midlayer fallback to 
+	   the same result, calling wd33c93_host_reset() */
+
 	spin_lock_irq(cmd->device->host->host_lock);
 	wd33c93_host_reset(cmd);
 	spin_unlock_irq(cmd->device->host->host_lock);
diff --git a/drivers/scsi/nsp32.c b/drivers/scsi/nsp32.c
index 6f15e7adbc6..5159ceea319 100644
--- a/drivers/scsi/nsp32.c
+++ b/drivers/scsi/nsp32.c
@@ -3051,11 +3051,14 @@ static int nsp32_eh_host_reset(struct scsi_cmnd *SCpnt)
 	nsp32_msg(KERN_INFO, "Host Reset");	
 	nsp32_dbg(NSP32_DEBUG_BUSRESET, "SCpnt=0x%x", SCpnt);
 
+	spin_lock_irq(SCpnt->device->host->host_lock);
+
 	nsp32hw_init(data);
 	nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);
 	nsp32_do_bus_reset(data);
 	nsp32_write2(base, IRQ_CONTROL, 0);
 
+	spin_unlock_irq(SCpnt->device->host->host_lock);
 	return SUCCESS;	/* Host reset is succeeded at any time. */
 }
 
diff --git a/drivers/scsi/pcmcia/sym53c500_cs.c b/drivers/scsi/pcmcia/sym53c500_cs.c
index 8457d0d7748..1667da9508b 100644
--- a/drivers/scsi/pcmcia/sym53c500_cs.c
+++ b/drivers/scsi/pcmcia/sym53c500_cs.c
@@ -627,7 +627,9 @@ SYM53C500_host_reset(struct scsi_cmnd *SCpnt)
 	int port_base = SCpnt->device->host->io_port;
 
 	DEB(printk("SYM53C500_host_reset called\n"));
+	spin_lock_irq(SCpnt->device->host->host_lock);
 	SYM53C500_int_host_reset(port_base);
+	spin_unlock_irq(SCpnt->device->host->host_lock);
 
 	return SUCCESS;
 }
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index d26dbe2a33f..1a4ce1c3947 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -1146,7 +1146,13 @@ qla1280_eh_bus_reset(struct scsi_cmnd *cmd)
 static int
 qla1280_eh_adapter_reset(struct scsi_cmnd *cmd)
 {
-	return qla1280_error_action(cmd, ADAPTER_RESET);
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = qla1280_error_action(cmd, ADAPTER_RESET);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
 }
 
 static int
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index e9091f9fbf2..f12a2b6fa7a 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -815,8 +815,6 @@ qla2xxx_eh_host_reset(struct scsi_cmnd *cmd)
 	qla_printk(KERN_INFO, ha,
 	    "scsi(%ld:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no, id, lun);
 
-	spin_unlock_irq(ha->host->host_lock);
-
 	if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
 		goto eh_host_reset_lock;
 
@@ -845,8 +843,6 @@ qla2xxx_eh_host_reset(struct scsi_cmnd *cmd)
 		ret = SUCCESS;
 
 eh_host_reset_lock:
-	spin_lock_irq(ha->host->host_lock);
-
 	qla_printk(KERN_INFO, ha, "%s: reset %s\n", __func__,
 	    (ret == FAILED) ? "failed" : "succeded");
 
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index be56ee67b7f..ceb4e0c99b3 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1082,9 +1082,7 @@ static int scsi_try_host_reset(struct scsi_cmnd *scmd)
 	if (!scmd->device->host->hostt->eh_host_reset_handler)
 		return FAILED;
 
-	spin_lock_irqsave(scmd->device->host->host_lock, flags);
 	rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
-	spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
 
 	if (rtn == SUCCESS) {
 		if (!scmd->device->host->hostt->skip_settle_delay)
diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c
index ed66828705e..a5ba2c69275 100644
--- a/drivers/scsi/sgiwd93.c
+++ b/drivers/scsi/sgiwd93.c
@@ -311,6 +311,9 @@ static int sgiwd93_bus_reset(Scsi_Cmnd *cmd)
 {
 	/* FIXME perform bus-specific reset */
 
+	/* FIXME 2: kill this function, and let midlayer fallback
+	   to the same result, calling wd33c93_host_reset() */
+
 	spin_lock_irq(cmd->device->host->host_lock);
 	wd33c93_host_reset(cmd);
 	spin_unlock_irq(cmd->device->host->host_lock);
diff --git a/drivers/scsi/sym53c416.c b/drivers/scsi/sym53c416.c
index ca9a04cf4d3..ef19adc67ef 100644
--- a/drivers/scsi/sym53c416.c
+++ b/drivers/scsi/sym53c416.c
@@ -790,6 +790,9 @@ static int sym53c416_host_reset(Scsi_Cmnd *SCpnt)
 	int base;
 	int scsi_id = -1;	
 	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sym53c416_lock, flags);
 
 	/* printk("sym53c416_reset\n"); */
 	base = SCpnt->device->host->io_port;
@@ -801,6 +804,8 @@ static int sym53c416_host_reset(Scsi_Cmnd *SCpnt)
 	outb(NOOP | PIO_MODE, base + COMMAND_REG);
 	outb(RESET_SCSI_BUS, base + COMMAND_REG);
 	sym53c416_init(base, scsi_id);
+
+	spin_unlock_irqrestore(&sym53c416_lock, flags);
 	return SUCCESS;
 }
 
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 6af9c18b3f9..d76766c3ce1 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -889,7 +889,13 @@ static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 
 static int sym53c8xx_eh_host_reset_handler(struct scsi_cmnd *cmd)
 {
-	return sym_eh_handler(SYM_EH_HOST_RESET, "HOST RESET", cmd);
+	int rc;
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	rc = sym_eh_handler(SYM_EH_HOST_RESET, "HOST RESET", cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	return rc;
 }
 
 /*
diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c
index a6a441937ac..98369ce0928 100644
--- a/drivers/scsi/u14-34f.c
+++ b/drivers/scsi/u14-34f.c
@@ -1417,16 +1417,20 @@ static int u14_34f_eh_host_reset(struct scsi_cmnd *SCarg) {
    printk("%s: reset, enter, target %d.%d:%d, pid %ld.\n",
           BN(j), SCarg->device->channel, SCarg->device->id, SCarg->device->lun, SCarg->pid);
 
+   spin_lock_irq(sh[j]->host_lock);
+
    if (SCarg->host_scribble == NULL)
       printk("%s: reset, pid %ld inactive.\n", BN(j), SCarg->pid);
 
    if (HD(j)->in_reset) {
       printk("%s: reset, exit, already in reset.\n", BN(j));
+      spin_unlock_irq(sh[j]->host_lock);
       return FAILED;
       }
 
    if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
       printk("%s: reset, exit, timeout error.\n", BN(j));
+      spin_unlock_irq(sh[j]->host_lock);
       return FAILED;
       }
 
@@ -1477,6 +1481,7 @@ static int u14_34f_eh_host_reset(struct scsi_cmnd *SCarg) {
 
    if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
       printk("%s: reset, cannot reset, timeout error.\n", BN(j));
+      spin_unlock_irq(sh[j]->host_lock);
       return FAILED;
       }
 
@@ -1538,6 +1543,7 @@ static int u14_34f_eh_host_reset(struct scsi_cmnd *SCarg) {
    if (arg_done) printk("%s: reset, exit, pid %ld done.\n", BN(j), SCarg->pid);
    else          printk("%s: reset, exit.\n", BN(j));
 
+   spin_unlock_irq(sh[j]->host_lock);
    return SUCCESS;
 }
 
diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c
index bf4a758e280..fb54a87a80a 100644
--- a/drivers/scsi/wd7000.c
+++ b/drivers/scsi/wd7000.c
@@ -1586,9 +1586,16 @@ static int wd7000_host_reset(struct scsi_cmnd *SCpnt)
 {
 	Adapter *host = (Adapter *) SCpnt->device->host->hostdata;
 
-	if (wd7000_adapter_reset(host) < 0)
+	spin_unlock_irq(SCpnt->device->host->host_lock);
+
+	if (wd7000_adapter_reset(host) < 0) {
+		spin_unlock_irq(SCpnt->device->host->host_lock);
 		return FAILED;
+	}
+
 	wd7000_enable_intr(host);
+
+	spin_unlock_irq(SCpnt->device->host->host_lock);
 	return SUCCESS;
 }