[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>
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 5886115..4d273ce 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -293,6 +293,10 @@
{
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 @@
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:
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index c018020..63c91dd 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -154,7 +154,9 @@
unsigned int id; /* target id ... replace
* scsi_device.id eventually */
unsigned long create:1; /* signal that it needs to be added */
- unsigned long starget_data[0];
+ void *hostdata; /* available to low-level driver */
+ unsigned long starget_data[0]; /* for the transport */
+ /* starget_data must be the last element!!!! */
} __attribute__((aligned(sizeof(unsigned long))));
#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 1cee1e1..db9914a 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -10,6 +10,7 @@
struct module;
struct scsi_cmnd;
struct scsi_device;
+struct scsi_target;
struct Scsi_Host;
struct scsi_host_cmd_pool;
struct scsi_transport_template;
@@ -228,6 +229,30 @@
void (* slave_destroy)(struct scsi_device *);
/*
+ * Before the mid layer attempts to scan for a new device attached
+ * to a target where no target currently exists, it will call this
+ * entry in your driver. Should your driver need to allocate any
+ * structs or perform any other init items in order to send commands
+ * to a currently unused target, then this is where you can perform
+ * those allocations.
+ *
+ * Return values: 0 on success, non-0 on failure
+ *
+ * Status: OPTIONAL
+ */
+ int (* target_alloc)(struct scsi_target *);
+
+ /*
+ * Immediately prior to deallocating the target structure, and
+ * after all activity to attached scsi devices has ceased, the
+ * midlayer calls this point so that the driver may deallocate
+ * and terminate any references to the target.
+ *
+ * Status: OPTIONAL
+ */
+ void (* target_destroy)(struct scsi_target *);
+
+ /*
* fill in this function to allow the queue depth of this host
* to be changeable (on a per device basis). returns either
* the current queue depth setting (may be different from what
