[SCSI] Add target alloc/destroy callbacks to the host template

This gives the HBA driver notice when a target is created and
destroyed to allow it to manage its own target based allocations
accordingly.

This is a much reduced verson of the original patch sent in by
James.Smart@Emulex.com

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

1 files changed, 21 insertions, 3 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 588611568d14..4d273ceb1d09 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -293,6 +293,10 @@ static void scsi_target_dev_release(struct device *dev)
 {
         struct device *parent = dev->parent;
         struct scsi_target *starget = to_scsi_target(dev);
+        struct Scsi_Host *shost = dev_to_shost(parent);
+
+        if (shost->hostt->target_destroy)
+                shost->hostt->target_destroy(starget);
         kfree(starget);
         put_device(parent);
 }
@@ -360,9 +364,23 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
         list_add_tail(&starget->siblings, &shost->__targets);
         spin_unlock_irqrestore(shost->host_lock, flags);
         /* allocate and add */
-        transport_setup_device(&starget->dev);
-        device_add(&starget->dev);
-        transport_add_device(&starget->dev);
+        transport_setup_device(dev);
+        device_add(dev);
+        transport_add_device(dev);
+        if (shost->hostt->target_alloc) {
+                int error = shost->hostt->target_alloc(starget);
+
+                if(error) {
+                        dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
+                        /* don't want scsi_target_reap to do the final
+                         * put because it will be under the host lock */
+                        get_device(dev);
+                        scsi_target_reap(starget);
+                        put_device(dev);
+                        return NULL;
+                }
+        }
+
         return starget;
 
  found: