From: James Bottomley <James.Bottomley@SteelEye.com>

Cc: Alex Davis <alex14641@yahoo.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/scsi/aha152x.c |   53 +++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 29 deletions(-)

diff -puN drivers/scsi/aha152x.c~aha152x-fix drivers/scsi/aha152x.c
--- a/drivers/scsi/aha152x.c~aha152x-fix
+++ a/drivers/scsi/aha152x.c
@@ -253,6 +253,7 @@
 #include <linux/isapnp.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
+#include <linux/list.h>
 #include <asm/semaphore.h>
 #include <scsi/scsicam.h>
 
@@ -262,6 +263,8 @@
 #include <scsi/scsi_transport_spi.h>
 #include "aha152x.h"
 
+static LIST_HEAD(aha152x_host_list);
+
 
 /* DEFINES */
 
@@ -423,8 +426,6 @@ MODULE_DEVICE_TABLE(isapnp, id_table);
 
 #endif /* !PCMCIA */
 
-static int registered_count=0;
-static struct Scsi_Host *aha152x_host[2];
 static struct scsi_host_template aha152x_driver_template;
 
 /*
@@ -541,6 +542,7 @@ struct aha152x_hostdata {
 #ifdef __ISAPNP__
 	struct pnp_dev *pnpdev;
 #endif
+	struct list_head host_list;
 };
 
 
@@ -755,20 +757,9 @@ static inline Scsi_Cmnd *remove_SC(Scsi_
 	return ptr;
 }
 
-static inline struct Scsi_Host *lookup_irq(int irqno)
-{
-	int i;
-
-	for(i=0; i<ARRAY_SIZE(aha152x_host); i++)
-		if(aha152x_host[i] && aha152x_host[i]->irq==irqno)
-			return aha152x_host[i];
-
-	return NULL;
-}
-
 static irqreturn_t swintr(int irqno, void *dev_id, struct pt_regs *regs)
 {
-	struct Scsi_Host *shpnt = lookup_irq(irqno);
+	struct Scsi_Host *shpnt = (struct Scsi_Host *)dev_id;
 
 	if (!shpnt) {
         	printk(KERN_ERR "aha152x: catched software interrupt %d for unknown controller.\n", irqno);
@@ -791,10 +782,11 @@ struct Scsi_Host *aha152x_probe_one(stru
 		return NULL;
 	}
 
-	/* need to have host registered before triggering any interrupt */
-	aha152x_host[registered_count] = shpnt;
-
 	memset(HOSTDATA(shpnt), 0, sizeof *HOSTDATA(shpnt));
+	INIT_LIST_HEAD(&HOSTDATA(shpnt)->host_list);
+
+	/* need to have host registered before triggering any interrupt */
+	list_add_tail(&HOSTDATA(shpnt)->host_list, &aha152x_host_list);
 
 	shpnt->io_port   = setup->io_port;
 	shpnt->n_io_port = IO_RANGE;
@@ -907,12 +899,10 @@ struct Scsi_Host *aha152x_probe_one(stru
 
 	scsi_scan_host(shpnt);
 
-	registered_count++;
-
 	return shpnt;
 
 out_host_put:
-	aha152x_host[registered_count]=NULL;
+	list_del(&HOSTDATA(shpnt)->host_list);
 	scsi_host_put(shpnt);
 
 	return NULL;
@@ -937,6 +927,7 @@ void aha152x_release(struct Scsi_Host *s
 #endif
 
 	scsi_remove_host(shpnt);
+	list_del(&HOSTDATA(shpnt)->host_list);
 	scsi_host_put(shpnt);
 }
 
@@ -1459,9 +1450,12 @@ static struct work_struct aha152x_tq;
  */
 static void run(void)
 {
-	int i;
-	for (i = 0; i<ARRAY_SIZE(aha152x_host); i++) {
-		is_complete(aha152x_host[i]);
+	struct aha152x_hostdata *hd;
+
+	list_for_each_entry(hd, &aha152x_host_list, host_list) {
+		struct Scsi_Host *shost = container_of((void *)hd, struct Scsi_Host, hostdata);
+
+		is_complete(shost);
 	}
 }
 
@@ -1471,7 +1465,7 @@ static void run(void)
  */
 static irqreturn_t intr(int irqno, void *dev_id, struct pt_regs *regs)
 {
-	struct Scsi_Host *shpnt = lookup_irq(irqno);
+	struct Scsi_Host *shpnt = (struct Scsi_Host *)dev_id;
 	unsigned long flags;
 	unsigned char rev, dmacntrl0;
 
@@ -3953,16 +3947,17 @@ static int __init aha152x_init(void)
 #endif
 	}
 
-	return registered_count>0;
+	return 1;
 }
 
 static void __exit aha152x_exit(void)
 {
-	int i;
+	struct aha152x_hostdata *hd;
+
+	list_for_each_entry(hd, &aha152x_host_list, host_list) {
+		struct Scsi_Host *shost = container_of((void *)hd, struct Scsi_Host, hostdata);
 
-	for(i=0; i<ARRAY_SIZE(setup); i++) {
-		aha152x_release(aha152x_host[i]);
-		aha152x_host[i]=NULL;
+		aha152x_release(shost);
 	}
 }
 
_