cciss: Dynamically allocate the drive_info_struct for each logical drive.

cciss: Dynamically allocate the drive_info_struct for each logical drive.
This reduces the size of the per-hba ctlr_info structure from 106936
bytes to 8132 bytes.  That's on 32-bit systems.  On 64-bit systems, the
improvement is even bigger.  Without this, the ctlr_info struct is so big
that the driver won't even load on a 64 bit system if CISS_MAX_LUN was
at it's current setting of 1024 logical drives.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 168 insertions, 130 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index b808e9287b73..04036ef8ea5a 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -201,6 +201,7 @@ static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c);
 static void cciss_hba_release(struct device *dev);
 static void cciss_device_release(struct device *dev);
 static void cciss_free_gendisk(ctlr_info_t *h, int drv_index);
+static void cciss_free_drive_info(ctlr_info_t *h, int drv_index);
 
 #ifdef CONFIG_PROC_FS
 static void cciss_procinit(int i);
@@ -327,7 +328,7 @@ static int cciss_seq_show(struct seq_file *seq, void *v)
         ctlr_info_t *h = seq->private;
         unsigned ctlr = h->ctlr;
         loff_t *pos = v;
-        drive_info_struct *drv = &h->drv[*pos];
+        drive_info_struct *drv = h->drv[*pos];
 
         if (*pos > h->highest_lun)
                 return 0;
@@ -461,6 +462,7 @@ static void __devinit cciss_procinit(int i)
 #define MAX_PRODUCT_NAME_LEN 19
 
 #define to_hba(n) container_of(n, struct ctlr_info, dev)
+#define to_drv(n) container_of(n, drive_info_struct, dev)
 
 static ssize_t host_store_rescan(struct device *dev,
                                  struct device_attribute *attr,
@@ -480,8 +482,8 @@ static ssize_t dev_show_unique_id(struct device *dev,
                                  struct device_attribute *attr,
                                  char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         __u8 sn[16];
         unsigned long flags;
         int ret = 0;
@@ -510,8 +512,8 @@ static ssize_t dev_show_vendor(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         char vendor[VENDOR_LEN + 1];
         unsigned long flags;
         int ret = 0;
@@ -534,8 +536,8 @@ static ssize_t dev_show_model(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         char model[MODEL_LEN + 1];
         unsigned long flags;
         int ret = 0;
@@ -558,8 +560,8 @@ static ssize_t dev_show_rev(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         char rev[REV_LEN + 1];
         unsigned long flags;
         int ret = 0;
@@ -581,8 +583,8 @@ DEVICE_ATTR(rev, S_IRUGO, dev_show_rev, NULL);
 static ssize_t cciss_show_lunid(struct device *dev,
                                 struct device_attribute *attr, char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         unsigned long flags;
         unsigned char lunid[8];
 
@@ -606,8 +608,8 @@ DEVICE_ATTR(lunid, S_IRUGO, cciss_show_lunid, NULL);
 static ssize_t cciss_show_raid_level(struct device *dev,
                                      struct device_attribute *attr, char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         int raid;
         unsigned long flags;
 
@@ -629,8 +631,8 @@ DEVICE_ATTR(raid_level, S_IRUGO, cciss_show_raid_level, NULL);
 static ssize_t cciss_show_usage_count(struct device *dev,
                                       struct device_attribute *attr, char *buf)
 {
-        drive_info_struct *drv = dev_get_drvdata(dev);
-        struct ctlr_info *h = to_hba(drv->dev->parent);
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
         unsigned long flags;
         int count;
 
@@ -733,11 +735,12 @@ static void cciss_destroy_hba_sysfs_entry(struct ctlr_info *h)
 }
 
 /* cciss_device_release is called when the reference count
- * of h->drv[x].dev goes to zero.
+ * of h->drv[x]dev goes to zero.
  */
 static void cciss_device_release(struct device *dev)
 {
-        kfree(dev);
+        drive_info_struct *drv = to_drv(dev);
+        kfree(drv);
 }
 
 /*
@@ -751,20 +754,16 @@ static long cciss_create_ld_sysfs_entry(struct ctlr_info *h,
 {
         struct device *dev;
 
-        /* Special case for c*d0, we only create it once. */
-        if (drv_index == 0 && h->drv[drv_index].dev != NULL)
+        if (h->drv[drv_index]->device_initialized)
                 return 0;
 
-        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-        if (!dev)
-                return -ENOMEM;
+        dev = &h->drv[drv_index]->dev;
         device_initialize(dev);
         dev->type = &cciss_dev_type;
         dev->bus = &cciss_bus_type;
         dev_set_name(dev, "c%dd%d", h->ctlr, drv_index);
         dev->parent = &h->dev;
-        h->drv[drv_index].dev = dev;
-        dev_set_drvdata(dev, &h->drv[drv_index]);
+        h->drv[drv_index]->device_initialized = 1;
         return device_add(dev);
 }
 
@@ -774,7 +773,7 @@ static long cciss_create_ld_sysfs_entry(struct ctlr_info *h,
 static void cciss_destroy_ld_sysfs_entry(struct ctlr_info *h, int drv_index,
         int ctlr_exiting)
 {
-        struct device *dev = h->drv[drv_index].dev;
+        struct device *dev = &h->drv[drv_index]->dev;
 
         /* special case for c*d0, we only destroy it on controller exit */
         if (drv_index == 0 && !ctlr_exiting)
@@ -782,7 +781,7 @@ static void cciss_destroy_ld_sysfs_entry(struct ctlr_info *h, int drv_index,
 
         device_del(dev);
         put_device(dev); /* the "final" put. */
-        h->drv[drv_index].dev = NULL;
+        h->drv[drv_index] = NULL;
 }
 
 /*
@@ -1625,7 +1624,10 @@ static void cciss_check_queues(ctlr_info_t *h)
                 /* make sure the disk has been added and the drive is real
                  * because this can be called from the middle of init_one.
                  */
-                if (!(h->drv[curr_queue].queue) || !(h->drv[curr_queue].heads))
+                if (!h->drv[curr_queue])
+                        continue;
+                if (!(h->drv[curr_queue]->queue) ||
+                        !(h->drv[curr_queue]->heads))
                         continue;
                 blk_start_queue(h->gendisk[curr_queue]->queue);
 
@@ -1685,8 +1687,8 @@ static void cciss_softirq_done(struct request *rq)
 static inline void log_unit_to_scsi3addr(ctlr_info_t *h,
         unsigned char scsi3addr[], uint32_t log_unit)
 {
-        memcpy(scsi3addr, h->drv[log_unit].LunID,
-                sizeof(h->drv[log_unit].LunID));
+        memcpy(scsi3addr, h->drv[log_unit]->LunID,
+                sizeof(h->drv[log_unit]->LunID));
 }
 
 /* This function gets the SCSI vendor, model, and revision of a logical drive
@@ -1776,12 +1778,10 @@ static int cciss_add_disk(ctlr_info_t *h, struct gendisk *disk,
         disk->major = h->major;
         disk->first_minor = drv_index << NWD_SHIFT;
         disk->fops = &cciss_fops;
-        if (h->drv[drv_index].dev == NULL) {
-                if (cciss_create_ld_sysfs_entry(h, drv_index))
-                        goto cleanup_queue;
-        }
-        disk->private_data = &h->drv[drv_index];
-        disk->driverfs_dev = h->drv[drv_index].dev;
+        if (cciss_create_ld_sysfs_entry(h, drv_index))
+                goto cleanup_queue;
+        disk->private_data = h->drv[drv_index];
+        disk->driverfs_dev = &h->drv[drv_index]->dev;
 
         /* Set up queue information */
         blk_queue_bounce_limit(disk->queue, h->pdev->dma_mask);
@@ -1799,13 +1799,13 @@ static int cciss_add_disk(ctlr_info_t *h, struct gendisk *disk,
         disk->queue->queuedata = h;
 
         blk_queue_logical_block_size(disk->queue,
-                                     h->drv[drv_index].block_size);
+                                     h->drv[drv_index]->block_size);
 
         /* Make sure all queue data is written out before */
-        /* setting h->drv[drv_index].queue, as setting this */
+        /* setting h->drv[drv_index]->queue, as setting this */
         /* allows the interrupt handler to start the queue */
         wmb();
-        h->drv[drv_index].queue = disk->queue;
+        h->drv[drv_index]->queue = disk->queue;
         add_disk(disk);
         return 0;
 
@@ -1840,7 +1840,7 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
 
         /* Get information about the disk and modify the driver structure */
         inq_buff = kmalloc(sizeof(InquiryData_struct), GFP_KERNEL);
-        drvinfo = kmalloc(sizeof(*drvinfo), GFP_KERNEL);
+        drvinfo = kzalloc(sizeof(*drvinfo), GFP_KERNEL);
         if (inq_buff == NULL || drvinfo == NULL)
                 goto mem_msg;
 
@@ -1876,16 +1876,19 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
                                 drvinfo->model, drvinfo->rev);
         cciss_get_serial_no(ctlr, drv_index, 1, drvinfo->serial_no,
                         sizeof(drvinfo->serial_no));
+        /* Save the lunid in case we deregister the disk, below. */
+        memcpy(drvinfo->LunID, h->drv[drv_index]->LunID,
+                sizeof(drvinfo->LunID));
 
         /* Is it the same disk we already know, and nothing's changed? */
-        if (h->drv[drv_index].raid_level != -1 &&
+        if (h->drv[drv_index]->raid_level != -1 &&
                 ((memcmp(drvinfo->serial_no,
-                                h->drv[drv_index].serial_no, 16) == 0) &&
-                drvinfo->block_size == h->drv[drv_index].block_size &&
-                drvinfo->nr_blocks == h->drv[drv_index].nr_blocks &&
-                drvinfo->heads == h->drv[drv_index].heads &&
-                drvinfo->sectors == h->drv[drv_index].sectors &&
-                drvinfo->cylinders == h->drv[drv_index].cylinders))
+                                h->drv[drv_index]->serial_no, 16) == 0) &&
+                drvinfo->block_size == h->drv[drv_index]->block_size &&
+                drvinfo->nr_blocks == h->drv[drv_index]->nr_blocks &&
+                drvinfo->heads == h->drv[drv_index]->heads &&
+                drvinfo->sectors == h->drv[drv_index]->sectors &&
+                drvinfo->cylinders == h->drv[drv_index]->cylinders))
                         /* The disk is unchanged, nothing to update */
                         goto freeret;
 
@@ -1895,18 +1898,17 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
          * If the disk already exists then deregister it before proceeding
          * (unless it's the first disk (for the controller node).
          */
-        if (h->drv[drv_index].raid_level != -1 && drv_index != 0) {
+        if (h->drv[drv_index]->raid_level != -1 && drv_index != 0) {
                 printk(KERN_WARNING "disk %d has changed.\n", drv_index);
                 spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
-                h->drv[drv_index].busy_configuring = 1;
+                h->drv[drv_index]->busy_configuring = 1;
                 spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
 
-                /* deregister_disk sets h->drv[drv_index].queue = NULL
+                /* deregister_disk sets h->drv[drv_index]->queue = NULL
                  * which keeps the interrupt handler from starting
                  * the queue.
                  */
                 ret = deregister_disk(h, drv_index, 0, via_ioctl);
-                h->drv[drv_index].busy_configuring = 0;
         }
 
         /* If the disk is in use return */
@@ -1914,22 +1916,31 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
                 goto freeret;
 
         /* Save the new information from cciss_geometry_inquiry
-         * and serial number inquiry.
+         * and serial number inquiry.  If the disk was deregistered
+         * above, then h->drv[drv_index] will be NULL.
          */
-        h->drv[drv_index].block_size = drvinfo->block_size;
-        h->drv[drv_index].nr_blocks = drvinfo->nr_blocks;
-        h->drv[drv_index].heads = drvinfo->heads;
-        h->drv[drv_index].sectors = drvinfo->sectors;
-        h->drv[drv_index].cylinders = drvinfo->cylinders;
-        h->drv[drv_index].raid_level = drvinfo->raid_level;
-        memcpy(h->drv[drv_index].serial_no, drvinfo->serial_no, 16);
-        memcpy(h->drv[drv_index].vendor, drvinfo->vendor, VENDOR_LEN + 1);
-        memcpy(h->drv[drv_index].model, drvinfo->model, MODEL_LEN + 1);
-        memcpy(h->drv[drv_index].rev, drvinfo->rev, REV_LEN + 1);
+        if (h->drv[drv_index] == NULL) {
+                drvinfo->device_initialized = 0;
+                h->drv[drv_index] = drvinfo;
+                drvinfo = NULL; /* so it won't be freed below. */
+        } else {
+                /* special case for cxd0 */
+                h->drv[drv_index]->block_size = drvinfo->block_size;
+                h->drv[drv_index]->nr_blocks = drvinfo->nr_blocks;
+                h->drv[drv_index]->heads = drvinfo->heads;
+                h->drv[drv_index]->sectors = drvinfo->sectors;
+                h->drv[drv_index]->cylinders = drvinfo->cylinders;
+                h->drv[drv_index]->raid_level = drvinfo->raid_level;
+                memcpy(h->drv[drv_index]->serial_no, drvinfo->serial_no, 16);
+                memcpy(h->drv[drv_index]->vendor, drvinfo->vendor,
+                        VENDOR_LEN + 1);
+                memcpy(h->drv[drv_index]->model, drvinfo->model, MODEL_LEN + 1);
+                memcpy(h->drv[drv_index]->rev, drvinfo->rev, REV_LEN + 1);
+        }
 
         ++h->num_luns;
         disk = h->gendisk[drv_index];
-        set_capacity(disk, h->drv[drv_index].nr_blocks);
+        set_capacity(disk, h->drv[drv_index]->nr_blocks);
 
         /* If it's not disk 0 (drv_index != 0)
          * or if it was disk 0, but there was previously
@@ -1940,6 +1951,7 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time,
         if (drv_index || first_time) {
                 if (cciss_add_disk(h, disk, drv_index) != 0) {
                         cciss_free_gendisk(h, drv_index);
+                        cciss_free_drive_info(h, drv_index);
                         printk(KERN_WARNING "cciss:%d could not update "
                                 "disk %d\n", h->ctlr, drv_index);
                         --h->num_luns;
@@ -1956,28 +1968,64 @@ mem_msg:
 }
 
 /* This function will find the first index of the controllers drive array
- * that has a -1 for the raid_level and will return that index.  This is
- * where new drives will be added.  If the index to be returned is greater
- * than the highest_lun index for the controller then highest_lun is set
- * to this new index.  If there are no available indexes then -1 is returned.
- * "controller_node" is used to know if this is a real logical drive, or just
- * the controller node, which determines if this counts towards highest_lun.
+ * that has a null drv pointer and allocate the drive info struct and
+ * will return that index   This is where new drives will be added.
+ * If the index to be returned is greater than the highest_lun index for
+ * the controller then highest_lun is set * to this new index.
+ * If there are no available indexes or if tha allocation fails, then -1
+ * is returned.  * "controller_node" is used to know if this is a real
+ * logical drive, or just the controller node, which determines if this
+ * counts towards highest_lun.
  */
-static int cciss_find_free_drive_index(int ctlr, int controller_node)
+static int cciss_alloc_drive_info(ctlr_info_t *h, int controller_node)
 {
         int i;
+        drive_info_struct *drv;
 
+        /* Search for an empty slot for our drive info */
         for (i = 0; i < CISS_MAX_LUN; i++) {
-                if (hba[ctlr]->drv[i].raid_level == -1) {
-                        if (i > hba[ctlr]->highest_lun)
-                                if (!controller_node)
-                                        hba[ctlr]->highest_lun = i;
+
+                /* if not cxd0 case, and it's occupied, skip it. */
+                if (h->drv[i] && i != 0)
+                        continue;
+                /*
+                 * If it's cxd0 case, and drv is alloc'ed already, and a
+                 * disk is configured there, skip it.
+                 */
+                if (i == 0 && h->drv[i] && h->drv[i]->raid_level != -1)
+                        continue;
+
+                /*
+                 * We've found an empty slot.  Update highest_lun
+                 * provided this isn't just the fake cxd0 controller node.
+                 */
+                if (i > h->highest_lun && !controller_node)
+                        h->highest_lun = i;
+
+                /* If adding a real disk at cxd0, and it's already alloc'ed */
+                if (i == 0 && h->drv[i] != NULL)
                         return i;
-                }
+
+                /*
+                 * Found an empty slot, not already alloc'ed.  Allocate it.
+                 * Mark it with raid_level == -1, so we know it's new later on.
+                 */
+                drv = kzalloc(sizeof(*drv), GFP_KERNEL);
+                if (!drv)
+                        return -1;
+                drv->raid_level = -1; /* so we know it's new */
+                h->drv[i] = drv;
+                return i;
         }
         return -1;
 }
 
+static void cciss_free_drive_info(ctlr_info_t *h, int drv_index)
+{
+        kfree(h->drv[drv_index]);
+        h->drv[drv_index] = NULL;
+}
+
 static void cciss_free_gendisk(ctlr_info_t *h, int drv_index)
 {
         put_disk(h->gendisk[drv_index]);
@@ -1998,7 +2046,7 @@ static int cciss_add_gendisk(ctlr_info_t *h, unsigned char lunid[],
 {
         int drv_index;
 
-        drv_index = cciss_find_free_drive_index(h->ctlr, controller_node);
+        drv_index = cciss_alloc_drive_info(h, controller_node);
         if (drv_index == -1)
                 return -1;
 
@@ -2010,24 +2058,24 @@ static int cciss_add_gendisk(ctlr_info_t *h, unsigned char lunid[],
                         printk(KERN_ERR "cciss%d: could not "
                                 "allocate a new disk %d\n",
                                 h->ctlr, drv_index);
-                        return -1;
+                        goto err_free_drive_info;
                 }
         }
-        memcpy(h->drv[drv_index].LunID, lunid,
-                sizeof(h->drv[drv_index].LunID));
-        if (h->drv[drv_index].dev == NULL) {
-                if (cciss_create_ld_sysfs_entry(h, drv_index))
-                        goto err_free_disk;
-        }
+        memcpy(h->drv[drv_index]->LunID, lunid,
+                sizeof(h->drv[drv_index]->LunID));
+        if (cciss_create_ld_sysfs_entry(h, drv_index))
+                goto err_free_disk;
         /* Don't need to mark this busy because nobody */
         /* else knows about this disk yet to contend */
         /* for access to it. */
-        h->drv[drv_index].busy_configuring = 0;
+        h->drv[drv_index]->busy_configuring = 0;
         wmb();
         return drv_index;
 
 err_free_disk:
         cciss_free_gendisk(h, drv_index);
+err_free_drive_info:
+        cciss_free_drive_info(h, drv_index);
         return -1;
 }
 
@@ -2047,17 +2095,18 @@ static void cciss_add_controller_node(ctlr_info_t *h)
         drv_index = cciss_add_gendisk(h, CTLR_LUNID, 1);
         if (drv_index == -1)
                 goto error;
-        h->drv[drv_index].block_size = 512;
-        h->drv[drv_index].nr_blocks = 0;
-        h->drv[drv_index].heads = 0;
-        h->drv[drv_index].sectors = 0;
-        h->drv[drv_index].cylinders = 0;
-        h->drv[drv_index].raid_level = -1;
-        memset(h->drv[drv_index].serial_no, 0, 16);
+        h->drv[drv_index]->block_size = 512;
+        h->drv[drv_index]->nr_blocks = 0;
+        h->drv[drv_index]->heads = 0;
+        h->drv[drv_index]->sectors = 0;
+        h->drv[drv_index]->cylinders = 0;
+        h->drv[drv_index]->raid_level = -1;
+        memset(h->drv[drv_index]->serial_no, 0, 16);
         disk = h->gendisk[drv_index];
         if (cciss_add_disk(h, disk, drv_index) == 0)
                 return;
         cciss_free_gendisk(h, drv_index);
+        cciss_free_drive_info(h, drv_index);
 error:
         printk(KERN_WARNING "cciss%d: could not "
                 "add disk 0.\n", h->ctlr);
@@ -2136,12 +2185,12 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
                 drv_found = 0;
 
                 /* skip holes in the array from already deleted drives */
-                if (h->drv[i].raid_level == -1)
+                if (h->drv[i] == NULL)
                         continue;
 
                 for (j = 0; j < num_luns; j++) {
                         memcpy(lunid, &ld_buff->LUN[j][0], sizeof(lunid));
-                        if (memcmp(h->drv[i].LunID, lunid,
+                        if (memcmp(h->drv[i]->LunID, lunid,
                                 sizeof(lunid)) == 0) {
                                 drv_found = 1;
                                 break;
@@ -2150,10 +2199,11 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
                 if (!drv_found) {
                         /* Deregister it from the OS, it's gone. */
                         spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
-                        h->drv[i].busy_configuring = 1;
+                        h->drv[i]->busy_configuring = 1;
                         spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
                         return_code = deregister_disk(h, i, 1, via_ioctl);
-                        h->drv[i].busy_configuring = 0;
+                        if (h->drv[i] != NULL)
+                                h->drv[i]->busy_configuring = 0;
                 }
         }
 
@@ -2174,9 +2224,9 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time,
                  * the first free index and add it.
                  */
                 for (j = 0; j <= h->highest_lun; j++) {
-                        if (h->drv[j].raid_level != -1 &&
-                                memcmp(h->drv[j].LunID, lunid,
-                                        sizeof(h->drv[j].LunID)) == 0) {
+                        if (h->drv[j] != NULL &&
+                                memcmp(h->drv[j]->LunID, lunid,
+                                        sizeof(h->drv[j]->LunID)) == 0) {
                                 drv_index = j;
                                 drv_found = 1;
                                 break;
@@ -2253,11 +2303,12 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
         int i;
         struct gendisk *disk;
         drive_info_struct *drv;
+        int recalculate_highest_lun;
 
         if (!capable(CAP_SYS_RAWIO))
                 return -EPERM;
 
-        drv = &h->drv[drv_index];
+        drv = h->drv[drv_index];
         disk = h->gendisk[drv_index];
 
         /* make sure logical volume is NOT is use */
@@ -2267,6 +2318,8 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
         } else if (drv->usage_count > 0)
                 return -EBUSY;
 
+        recalculate_highest_lun = (drv == h->drv[h->highest_lun]);
+
         /* invalidate the devices and deregister the disk.  If it is disk
          * zero do not deregister it but just zero out it's values.  This
          * allows us to delete disk zero but keep the controller registered.
@@ -2277,14 +2330,8 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
                         cciss_destroy_ld_sysfs_entry(h, drv_index, 0);
                         del_gendisk(disk);
                 }
-                if (q) {
+                if (q)
                         blk_cleanup_queue(q);
-                        /* Set drv->queue to NULL so that we do not try
-                         * to call blk_start_queue on this queue in the
-                         * interrupt handler
-                         */
-                        drv->queue = NULL;
-                }
                 /* If clear_all is set then we are deleting the logical
                  * drive, not just refreshing its info.  For drives
                  * other than disk 0 we will call put_disk.  We do not
@@ -2307,24 +2354,20 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
                 }
         } else {
                 set_capacity(disk, 0);
+                cciss_clear_drive_info(drv);
         }
 
         --h->num_luns;
-        cciss_clear_drive_info(drv);
-
-        if (clear_all) {
-                /* check to see if it was the last disk */
-                if (drv == h->drv + h->highest_lun) {
-                        /* if so, find the new hightest lun */
-                        int i, newhighest = -1;
-                        for (i = 0; i <= h->highest_lun; i++) {
-                                /* if the disk has size > 0, it is available */
-                                if (h->drv[i].heads)
-                                        newhighest = i;
-                        }
-                        h->highest_lun = newhighest;
+
+        /* if it was the last disk, find the new hightest lun */
+        if (clear_all && recalculate_highest_lun) {
+                int i, newhighest = -1;
+                for (i = 0; i <= h->highest_lun; i++) {
+                        /* if the disk has size > 0, it is available */
+                        if (h->drv[i] && h->drv[i]->heads)
+                                newhighest = i;
                 }
-                memset(drv->LunID, 0, sizeof(drv->LunID));
+                h->highest_lun = newhighest;
         }
         return 0;
 }
@@ -2755,7 +2798,7 @@ static int cciss_revalidate(struct gendisk *disk)
         InquiryData_struct *inq_buff = NULL;
 
         for (logvol = 0; logvol < CISS_MAX_LUN; logvol++) {
-                if (memcmp(h->drv[logvol].LunID, drv->LunID,
+                if (memcmp(h->drv[logvol]->LunID, drv->LunID,
                         sizeof(drv->LunID)) == 0) {
                         FOUND = 1;
                         break;
@@ -4293,8 +4336,7 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
         hba[i]->num_luns = 0;
         hba[i]->highest_lun = -1;
         for (j = 0; j < CISS_MAX_LUN; j++) {
-                hba[i]->drv[j].raid_level = -1;
-                hba[i]->drv[j].queue = NULL;
+                hba[i]->drv[j] = NULL;
                 hba[i]->gendisk[j] = NULL;
         }
 
@@ -4349,12 +4391,7 @@ clean1:
         cciss_destroy_hba_sysfs_entry(hba[i]);
 clean0:
         hba[i]->busy_initializing = 0;
-        /* cleanup any queues that may have been initialized */
-        for (j=0; j <= hba[i]->highest_lun; j++){
-                drive_info_struct *drv = &(hba[i]->drv[j]);
-                if (drv->queue)
-                        blk_cleanup_queue(drv->queue);
-        }
+
         /*
          * Deliberately omit pci_disable_device(): it does something nasty to
          * Smart Array controllers that pci_enable_device does not undo
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 5188f713d1b0..31524cf42c77 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -45,13 +45,14 @@ typedef struct _drive_info_struct
                                    * to prevent it from being opened or it's
                                    * queue from being started.
                                    */
-        struct  device *dev;
+        struct  device dev;
         __u8 serial_no[16]; /* from inquiry page 0x83,
                              * not necc. null terminated.
                              */
         char vendor[VENDOR_LEN + 1]; /* SCSI vendor string */
         char model[MODEL_LEN + 1];   /* SCSI model string */
         char rev[REV_LEN + 1];       /* SCSI revision string */
+        char device_initialized;     /* indicates whether dev is initialized */
 } drive_info_struct;
 
 struct ctlr_info 
@@ -87,7 +88,7 @@ struct ctlr_info
         BYTE    cciss_read_capacity;
 
         // information about each logical volume
-        drive_info_struct drv[CISS_MAX_LUN];
+        drive_info_struct *drv[CISS_MAX_LUN];
 
         struct access_method access;