Merge hch/andmike changes

drivers/acorn/scsi/acornscsi.c

@@ -3079,7 +3079,6 @@ static struct ecard_driver acornscsi_driver = {
 	.remove		= __devexit_p(acornscsi_remove),
 	.id_table	= acornscsi_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "acornscsi",
 	},
 };

drivers/acorn/scsi/arxescsi.c

@@ -397,7 +397,6 @@ static struct ecard_driver arxescsi_driver = {
 	.remove		= __devexit_p(arxescsi_remove),
 	.id_table	= arxescsi_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "arxescsi",
 	},
 };

drivers/acorn/scsi/cumana_1.c

@@ -334,7 +334,6 @@ static struct ecard_driver cumanascsi1_driver = {
 	.remove		= __devexit_p(cumanascsi1_remove),
 	.id_table	= cumanascsi1_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "cumanascsi1",
 	},
 };

drivers/acorn/scsi/cumana_2.c

@@ -552,7 +552,6 @@ static struct ecard_driver cumanascsi2_driver = {
 	.remove		= __devexit_p(cumanascsi2_remove),
 	.id_table	= cumanascsi2_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "cumanascsi2",
 	},
 };

drivers/acorn/scsi/eesox.c

@@ -660,7 +660,6 @@ static struct ecard_driver eesoxscsi_driver = {
 	.remove		= __devexit_p(eesoxscsi_remove),
 	.id_table	= eesoxscsi_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "eesoxscsi",
 	},
 };

drivers/acorn/scsi/oak.c

@@ -192,7 +192,6 @@ static struct ecard_driver oakscsi_driver = {
 	.remove		= __devexit_p(oakscsi_remove),
 	.id_table	= oakscsi_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "oakscsi",
 	},
 };

drivers/acorn/scsi/powertec.c

@@ -475,7 +475,6 @@ static struct ecard_driver powertecscsi_driver = {
 	.remove		= __devexit_p(powertecscsi_remove),
 	.id_table	= powertecscsi_cids,
 	.drv = {
-		.devclass	= &shost_devclass,
 		.name		= "powertecscsi",
 	},
 };

drivers/scsi/hosts.c

@@ -193,16 +193,6 @@ static int scsi_host_legacy_release(struct Scsi_Host *shost)
 	return 0;
 }
 
-static int scsi_remove_legacy_host(struct Scsi_Host *shost)
-{
-	int error;
-
-	error = scsi_remove_host(shost);
-	if (!error)
-		(*shost->hostt->release)(shost);
-	return 0;
-}
-
 static int scsi_check_device_busy(struct scsi_device *sdev)
 {
 	struct Scsi_Host *shost = sdev->host;
@@ -268,11 +258,8 @@ int scsi_remove_host(struct Scsi_Host *shost)
 	list_for_each_entry(sdev, &shost->my_devices, siblings)
 		sdev->online = FALSE;
 
-	list_for_each_entry(sdev, &shost->my_devices, siblings)
-		if (scsi_check_device_busy(sdev))
-			return 1;
-
 	scsi_forget_host(shost);
+	scsi_sysfs_remove_host(shost);
 	return 0;
 }
 
@@ -293,9 +280,9 @@ int scsi_add_host(struct Scsi_Host *shost, struct device *dev)
 	printk(KERN_INFO "scsi%d : %s\n", shost->host_no,
 			sht->info ? sht->info(shost) : sht->name);
 
-	if (dev) {
-		shost->host_gendev = dev;
-	}
+	error = scsi_sysfs_add_host(shost, dev);
+	if (error)
+		return error;
 
 	scsi_scan_host(shost);
 			
@@ -531,7 +518,7 @@ int scsi_register_host(Scsi_Host_Template *shost_tp)
  **/
 int scsi_unregister_host(Scsi_Host_Template *shost_tp)
 {
-	scsi_tp_for_each_host(shost_tp, scsi_remove_legacy_host);
+	scsi_tp_for_each_host(shost_tp, scsi_remove_host);
 	return 0;
 
 }

drivers/scsi/hosts.h

@@ -482,9 +482,10 @@ struct Scsi_Host
     unsigned int max_host_blocked;
 
     /* 
-     * Support for driverfs filesystem
+     * Support for sysfs
      */
-    struct device *host_gendev;
+    struct device host_gendev;
+    struct class_device class_dev;
 
     /*
      * We should ensure that this is aligned, both for better performance
@@ -495,7 +496,10 @@ struct Scsi_Host
         __attribute__ ((aligned (sizeof(unsigned long))));
 };
 
-#define	to_scsi_host(d)	d->driver_data	/* Major logical breakage, but we compile again... */
+#define		dev_to_shost(d)		\
+	container_of(d, struct Scsi_Host, host_gendev)
+#define		class_to_shost(d)	\
+	container_of(d, struct Scsi_Host, class_dev)
 
 /*
  * These two functions are used to allocate and free a pseudo device
@@ -519,12 +523,12 @@ static inline void scsi_assign_lock(struct Scsi_Host *shost, spinlock_t *lock)
 static inline void scsi_set_device(struct Scsi_Host *shost,
                                    struct device *dev)
 {
-        shost->host_gendev = dev;
+        shost->host_gendev.parent = dev;
 }
 
 static inline struct device *scsi_get_device(struct Scsi_Host *shost)
 {
-        return shost->host_gendev;
+        return shost->host_gendev.parent;
 }
 
 struct Scsi_Device_Template
@@ -591,6 +595,10 @@ static inline Scsi_Device *scsi_find_device(struct Scsi_Host *shost,
  */
 extern int scsi_upper_driver_register(struct Scsi_Device_Template *);
 extern void scsi_upper_driver_unregister(struct Scsi_Device_Template *);
+extern int scsi_sysfs_add_host(struct Scsi_Host *, struct device *);
+extern void scsi_sysfs_remove_host(struct Scsi_Host *);
+
+extern void scsi_free_sdev(struct scsi_device *);
 
 extern struct class shost_class;
 

drivers/scsi/scsi_debug.c

@@ -55,7 +55,7 @@
 #include "scsi_logging.h"
 #include "scsi_debug.h"
 
-static const char * scsi_debug_version_str = "Version: 1.69 (20030329)";
+static const char * scsi_debug_version_str = "Version: 1.70 (20030416)";
 
 /* Additional Sense Code (ASC) used */
 #define NO_ADDED_SENSE 0x0
@@ -145,10 +145,13 @@ struct sdebug_dev_info {
 struct sdebug_host_info {
 	struct list_head host_list;
 	struct Scsi_Host *shost;
-	struct device *dev;
+	struct device dev;
 	struct list_head dev_info_list;
 };
 
+#define to_sdebug_host(d)	\
+	container_of(d, struct sdebug_host_info, dev)
+
 static LIST_HEAD(sdebug_host_list);
 static spinlock_t sdebug_host_list_lock = SPIN_LOCK_UNLOCKED;
 
@@ -249,22 +252,6 @@ static struct bus_type pseudo_lld_bus;
 static int scsi_debug_register_driver(struct device_driver *);
 static int scsi_debug_unregister_driver(struct device_driver *);
 
-static struct sdebug_host_info * 
-		sdebug_shost_to_host_info(struct Scsi_Host *shost)
-{
-	struct sdebug_host_info * sdbg_host, * found = NULL;
-
-	spin_lock(&sdebug_host_list_lock);
-	list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
-		if (sdbg_host->shost == shost) {
-			found = sdbg_host;
-			break;
-		}
-	}
-	spin_unlock(&sdebug_host_list_lock);
-	return found;
-}
-
 static unsigned char * scatg2virt(const struct scatterlist * sclp)
 {
 	if (NULL == sclp)
@@ -668,6 +655,15 @@ static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
 	return sizeof(ctrl_m_pg);
 }
 
+static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
+{	/* Informational Exceptions control mode page for mode_sense */
+	unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
+				    0, 0, 0x0, 0x0};
+	memcpy(p, iec_m_pg, sizeof(iec_m_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(iec_m_pg) - 2);
+	return sizeof(iec_m_pg);
+}
 
 #define SDEBUG_MAX_MSENSE_SZ 256
 
@@ -734,12 +730,17 @@ static int resp_mode_sense(unsigned char * cmd, int target,
 		len = resp_ctrl_m_pg(ap, pcontrol, target);
 		offset += len;
 		break;
+	case 0x1c:	/* Informational Exceptions Mode page, all devices */
+		len = resp_iec_m_pg(ap, pcontrol, target);
+		offset += len;
+		break;
 	case 0x3f:	/* Read all Mode pages */
 		len = resp_err_recov_pg(ap, pcontrol, target);
 		len += resp_disconnect_pg(ap + len, pcontrol, target);
 		len += resp_format_pg(ap + len, pcontrol, target);
 		len += resp_caching_pg(ap + len, pcontrol, target);
 		len += resp_ctrl_m_pg(ap + len, pcontrol, target);
+		len += resp_iec_m_pg(ap + len, pcontrol, target);
 		offset += len;
 		break;
 	default:
@@ -963,9 +964,9 @@ static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
 
 	if (devip)
 		return devip;
-	sdbg_host = sdebug_shost_to_host_info(sdev->host);
+	sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
         if(! sdbg_host) {
-                printk(KERN_ERR "Unable to locate host info\n");
+                printk(KERN_ERR "Host info NULL\n");
 		return NULL;
         }
 	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
@@ -1065,7 +1066,7 @@ static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
 		printk(KERN_INFO "scsi_debug: bus_reset\n");
 	++num_bus_resets;
 	if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
-		sdbg_host = sdebug_shost_to_host_info(hp);
+		sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
 		if (sdbg_host) {
 			list_for_each_entry(dev_info,
                                             &sdbg_host->dev_info_list,
@@ -1546,8 +1547,11 @@ static int __init scsi_debug_init(void)
 
 static void __exit scsi_debug_exit(void)
 {
-	/* free up adapters here ?? */
+	int k = scsi_debug_add_host;
+
 	stop_all_queued();
+	for (; k; k--)
+		sdebug_remove_adapter();
 	do_remove_driverfs_files();
 	scsi_debug_unregister_driver(&sdebug_driverfs_driver);
 	bus_unregister(&pseudo_lld_bus);
@@ -1591,35 +1595,74 @@ static int scsi_debug_unregister_driver(struct device_driver *dev_driver)
 
 static void sdebug_release_adapter(struct device * dev)
 {
-        kfree(dev);
+        struct sdebug_host_info *sdbg_host;
+
+	sdbg_host = to_sdebug_host(dev);
+        kfree(sdbg_host);
 }
 
 static int sdebug_add_adapter()
 {
-        struct device * dev;
-        int error;
+	int k, devs_per_host;
+        int error = 0;
+        struct sdebug_host_info *sdbg_host;
+        struct sdebug_dev_info *sdbg_devinfo;
+        struct list_head *lh, *lh_sf;
 
-        dev = kmalloc(sizeof(*dev),GFP_KERNEL);
-        if (NULL == dev) {
+        sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL);
+
+        if (NULL == sdbg_host) {
                 printk(KERN_ERR "%s: out of memory at line %d\n",
                        __FUNCTION__, __LINE__);
                 return -ENOMEM;
         }
-        memset(dev, 0, sizeof(*dev));
 
-        dev->bus = &pseudo_lld_bus;
-        dev->parent = &pseudo_primary;
-        dev->release = &sdebug_release_adapter;
-        sprintf(dev->name, "scsi debug adapter");
-        sprintf(dev->bus_id, "adapter%d", scsi_debug_add_host);
+        memset(sdbg_host, 0, sizeof(*sdbg_host));
+        INIT_LIST_HEAD(&sdbg_host->dev_info_list);
 
-        error = device_register(dev);
+	devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
+        for (k = 0; k < devs_per_host; k++) {
+                sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL);
+                if (NULL == sdbg_devinfo) {
+                        printk(KERN_ERR "%s: out of memory at line %d\n",
+                               __FUNCTION__, __LINE__);
+                        error = -ENOMEM;
+			goto clean1;
+                }
+                memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo));
+                sdbg_devinfo->sdbg_host = sdbg_host;
+                list_add_tail(&sdbg_devinfo->dev_list,
+                              &sdbg_host->dev_info_list);
+        }
+
+        spin_lock(&sdebug_host_list_lock);
+        list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
+        spin_unlock(&sdebug_host_list_lock);
+
+        sdbg_host->dev.bus = &pseudo_lld_bus;
+        sdbg_host->dev.parent = &pseudo_primary;
+        sdbg_host->dev.release = &sdebug_release_adapter;
+        sprintf(sdbg_host->dev.name, "scsi debug adapter");
+        sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host);
+
+        error = device_register(&sdbg_host->dev);
 
         if (error)
-                kfree(dev);
-        else
+		goto clean2;
+
 	++scsi_debug_add_host;
+        return error;
+
+clean2:
+	list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
+		sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
+					  dev_list);
+		list_del(&sdbg_devinfo->dev_list);
+		kfree(sdbg_devinfo);
+	}
 
+clean1:
+	kfree(sdbg_host);
         return error;
 }
 
@@ -1628,51 +1671,29 @@ static void sdebug_remove_adapter()
         struct sdebug_host_info * sdbg_host = NULL;
 
         spin_lock(&sdebug_host_list_lock);
-        if (!list_empty(&sdebug_host_list))
+        if (!list_empty(&sdebug_host_list)) {
                 sdbg_host = list_entry(sdebug_host_list.prev,
                                        struct sdebug_host_info, host_list);
+		list_del(&sdbg_host->host_list);
+	}
         spin_unlock(&sdebug_host_list_lock);
 
-        device_unregister(sdbg_host->dev);
+	if (!sdbg_host)
+		return;
+
+        device_unregister(&sdbg_host->dev);
         --scsi_debug_add_host;
 }
 
 static int sdebug_driver_probe(struct device * dev)
 {
-	int k, devs_per_host;
         int error = 0;
         struct sdebug_host_info *sdbg_host;
-        struct sdebug_dev_info *sdbg_devinfo;
-        struct list_head *lh, *lh_sf;
         struct Scsi_Host *hpnt;
 
-        sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL);
-        if (NULL == sdbg_host) {
-                printk(KERN_ERR "%s: out of memory at line %d\n",
-                       __FUNCTION__, __LINE__);
-                return -ENOMEM;
-        }
-        memset(sdbg_host, 0, sizeof(*sdbg_host));
-
-        INIT_LIST_HEAD(&sdbg_host->dev_info_list);
-
-	devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
-        for (k = 0; k < devs_per_host; k++) {
-                sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL);
-                if (NULL == sdbg_devinfo) {
-                        printk(KERN_ERR "%s: out of memory at line %d\n",
-                               __FUNCTION__, __LINE__);
-                        error = -ENOMEM;
-                }
-                memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo));
-                sdbg_devinfo->sdbg_host = sdbg_host;
-                list_add_tail(&sdbg_devinfo->dev_list,
-                              &sdbg_host->dev_info_list);
-        }
-
-        list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
+	sdbg_host = to_sdebug_host(dev);
 
-        hpnt = scsi_register(&sdebug_driver_template, 0);
+        hpnt = scsi_register(&sdebug_driver_template, sizeof(sdbg_host));
         if (NULL == hpnt) {
                 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__);
                 error = -ENODEV;
@@ -1680,14 +1701,14 @@ static int sdebug_driver_probe(struct device * dev)
         }
 
         sdbg_host->shost = hpnt;
-        sdbg_host->dev = dev;
+	*((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
 	if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
 		hpnt->max_id = scsi_debug_num_tgts + 1;
 	else
 		hpnt->max_id = scsi_debug_num_tgts;
 	hpnt->max_lun = scsi_debug_max_luns;
 
-        error = scsi_add_host(hpnt, sdbg_host->dev);
+        error = scsi_add_host(hpnt, &sdbg_host->dev);
         if (error) {
                 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__);
                 error = -ENODEV;
@@ -1700,48 +1721,25 @@ static int sdebug_driver_probe(struct device * dev)
 clean2:
         scsi_unregister(hpnt);
 clean1:
-        list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
-                sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
-                                          dev_list);
-                list_del(&sdbg_devinfo->dev_list);
-                kfree(sdbg_devinfo);
-        }
-
         kfree(sdbg_host);
 
         return error;
 }
 
-static int sdebug_driver_remove(struct device * dev)
+static int scsi_debug_release(struct Scsi_Host * shost)
 {
         struct list_head *lh, *lh_sf;
         struct sdebug_dev_info *sdbg_devinfo;
-        struct sdebug_host_info *sdbg_host, *found = NULL;
-
-        spin_lock(&sdebug_host_list_lock);
-        list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
-                if (sdbg_host->dev == dev) {
-                        list_del(&sdbg_host->host_list);
-                        found = sdbg_host;
-                        break;
-                }
-        }
-        spin_unlock(&sdebug_host_list_lock);
-
-        if (!found) {
-                printk(KERN_ERR "%s: sdebug_host_info not found\n",
-                       __FUNCTION__);
-                return -ENODEV;
-        }
+        struct sdebug_host_info *sdbg_host;
 
+	sdbg_host = *(struct sdebug_host_info **)shost->hostdata;
+        scsi_unregister(shost);
 
-        if (scsi_remove_host(sdbg_host->shost)) {
-                printk(KERN_ERR "%s: scsi_remove_host failed\n", __FUNCTION__);
-                return -EBUSY;
+	if (!sdbg_host) {
+		printk(KERN_ERR "Unable to locate host info\n");
+		return 0;
 	}
 
-        scsi_unregister(sdbg_host->shost);
-
         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
                                           dev_list);
@@ -1749,7 +1747,20 @@ static int sdebug_driver_remove(struct device * dev)
                 kfree(sdbg_devinfo);
         }
 
-        kfree(sdbg_host);
+        return 0;
+
+}
+
+static int sdebug_driver_remove(struct device * dev)
+{
+        struct sdebug_host_info *sdbg_host;
+
+	sdbg_host = to_sdebug_host(dev);
+
+        if (sdbg_host && scsi_remove_host(sdbg_host->shost)) {
+                printk(KERN_ERR "%s: scsi_remove_host failed\n", __FUNCTION__);
+                return -EBUSY;
+        }
 
         return 0;
 }

drivers/scsi/scsi_debug.h

@@ -16,6 +16,7 @@ static int scsi_debug_device_reset(struct scsi_cmnd *);
 static int scsi_debug_host_reset(struct scsi_cmnd *);
 static int scsi_debug_proc_info(char *, char **, off_t, int, int, int);
 static const char * scsi_debug_info(struct Scsi_Host *);
+static int scsi_debug_release(struct Scsi_Host *);
 
 /*
  * This driver is written for the lk 2.5 series

drivers/scsi/scsi_scan.c

@@ -480,7 +480,7 @@ static struct scsi_device *scsi_alloc_sdev(struct Scsi_Host *shost,
  *     Undo the actions in scsi_alloc_sdev, including removing @sdev from
  *     the list, and freeing @sdev.
  **/
-static void scsi_free_sdev(struct scsi_device *sdev)
+void scsi_free_sdev(struct scsi_device *sdev)
 {
 	unsigned long flags;
 
@@ -1273,8 +1273,6 @@ int scsi_remove_device(struct scsi_device *sdev)
 		return -EINVAL;
 
 	scsi_device_unregister(sdev);
-
-	scsi_free_sdev(sdev);
 	return 0;
 }
 

drivers/scsi/scsi_sysfs.c

@@ -22,9 +22,9 @@
  */
 #define shost_show_function(field, format_string)			\
 static ssize_t								\
-show_##field (struct device *dev, char *buf)				\
+show_##field (struct class_device *class_dev, char *buf)		\
 {									\
-	struct Scsi_Host *shost = to_scsi_host(dev);			\
+	struct Scsi_Host *shost = class_to_shost(class_dev);		\
 	return snprintf (buf, 20, format_string, shost->field);	\
 }
 
@@ -34,7 +34,7 @@ show_##field (struct device *dev, char *buf)				\
  */
 #define shost_rd_attr(field, format_string)				\
 	shost_show_function(field, format_string)			\
-static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL)
+static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL)
 
 /*
  * Create the actual show/store functions and data structures.
@@ -45,39 +45,16 @@ shost_rd_attr(cmd_per_lun, "%hd\n");
 shost_rd_attr(sg_tablesize, "%hu\n");
 shost_rd_attr(unchecked_isa_dma, "%d\n");
 
-static struct device_attribute *const shost_attrs[] = {
-	&dev_attr_unique_id,
-	&dev_attr_host_busy,
-	&dev_attr_cmd_per_lun,
-	&dev_attr_sg_tablesize,
-	&dev_attr_unchecked_isa_dma,
+static struct class_device_attribute *const shost_attrs[] = {
+	&class_device_attr_unique_id,
+	&class_device_attr_host_busy,
+	&class_device_attr_cmd_per_lun,
+	&class_device_attr_sg_tablesize,
+	&class_device_attr_unchecked_isa_dma,
 };
 
-/**
- * scsi_host_class_name_show - copy out the SCSI host name
- * @dev:		device to check
- * @page:		copy data into this area
- * @count:		number of bytes to copy
- * @off:		start at this offset in page
- * Return:
- *     number of bytes written into page.
- **/
-static ssize_t scsi_host_class_name_show(struct device *dev, char *page)
-{
-	struct Scsi_Host *shost;
-
-	shost = to_scsi_host(dev);
-
-	if (!shost)
-		return 0;
-	
-	return snprintf(page, 20, "scsi%d\n", shost->host_no);
-}
-
-DEVICE_ATTR(class_name, S_IRUGO, scsi_host_class_name_show, NULL);
-
 struct class shost_class = {
-	.name		= "scsi-host",
+	.name		= "scsi_host",
 };
 
 /**
@@ -114,10 +91,16 @@ static struct bus_type scsi_bus_type = {
 
 int scsi_sysfs_register(void)
 {
-	bus_register(&scsi_bus_type);
-	class_register(&shost_class);
+	int error;
 
-	return 0;
+	error = bus_register(&scsi_bus_type);
+	if (error)
+		return error;
+	error = class_register(&shost_class);
+	if (error)
+		return error;
+
+	return error;
 }
 
 void scsi_sysfs_unregister(void)
@@ -273,6 +256,16 @@ static struct device_attribute * const sdev_attrs[] = {
 	&dev_attr_rescan,
 };
 
+static void scsi_device_release(struct device *dev)
+{
+	struct scsi_device *sdev;
+
+	sdev = to_scsi_device(dev);
+	if (!sdev)
+		return;
+	scsi_free_sdev(sdev);
+}
+
 /**
  * scsi_device_register - register a scsi device with the scsi bus
  * @sdev:	scsi_device to register
@@ -286,8 +279,9 @@ int scsi_device_register(struct scsi_device *sdev)
 
 	sprintf(sdev->sdev_driverfs_dev.bus_id,"%d:%d:%d:%d",
 		sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
-	sdev->sdev_driverfs_dev.parent = sdev->host->host_gendev;
+	sdev->sdev_driverfs_dev.parent = &sdev->host->host_gendev;
 	sdev->sdev_driverfs_dev.bus = &scsi_bus_type;
+	sdev->sdev_driverfs_dev.release = scsi_device_release;
 
 	error = device_register(&sdev->sdev_driverfs_dev);
 	if (error)
@@ -315,3 +309,67 @@ void scsi_device_unregister(struct scsi_device *sdev)
 		device_remove_file(&sdev->sdev_driverfs_dev, sdev_attrs[i]);
 	device_unregister(&sdev->sdev_driverfs_dev);
 }
+
+static void scsi_host_release(struct device *dev)
+{
+	struct Scsi_Host *shost;
+
+	shost = dev_to_shost(dev);
+	if (!shost)
+		return;
+	shost->hostt->release(shost);
+}
+
+/**
+ * scsi_sysfs_add_host - add scsi host to subsystem
+ * @shost:     scsi host struct to add to subsystem
+ * @dev:       parent struct device pointer
+ **/
+int scsi_sysfs_add_host(struct Scsi_Host *shost, struct device *dev)
+{
+	int i, error;
+
+	sprintf(shost->host_gendev.bus_id,"host%d",
+		shost->host_no);
+	if (!shost->host_gendev.parent)
+		shost->host_gendev.parent = (dev) ? dev : &legacy_bus;
+	shost->host_gendev.release = scsi_host_release;
+
+	error = device_register(&shost->host_gendev);
+	if (error)
+		return error;
+
+	shost->class_dev.dev = &shost->host_gendev;
+	shost->class_dev.class = &shost_class;
+	snprintf(shost->class_dev.class_id, BUS_ID_SIZE, "host%d",
+		  shost->host_no);
+	error = class_device_register(&shost->class_dev);
+	if (error)
+		goto clean_device;
+
+	for (i = 0; !error && i < ARRAY_SIZE(shost_attrs); i++)
+		error = class_device_create_file(&shost->class_dev,
+					   shost_attrs[i]);
+	if (error)
+		goto clean_class;
+
+	return error;
+
+clean_class:
+	class_device_unregister(&shost->class_dev);
+clean_device:
+	device_unregister(&shost->host_gendev);
+
+	return error;
+}
+
+/**
+ * scsi_sysfs_remove_host - remove scsi host from subsystem
+ * @shost:     scsi host to remove from subsystem
+ **/
+void scsi_sysfs_remove_host(struct Scsi_Host *shost)
+{
+	class_device_unregister(&shost->class_dev);
+	device_unregister(&shost->host_gendev);
+}
+