[SCSI] remove target parent limitiation

When James Smart fixed the issue of the userspace scan atributes
crashing the system with the FC transport class he added a patch to
let the transport class check if the parent is valid for a given
transport class.

When adding support for the integrated raid of fusion sas devices
we ran into a problem with that, as it didn't allow adding virtual
raid volumes without the transport class knowing about it.

So this patch adds a user_scan attribute instead, that takes over from
scsi_scan_host_selected if the transport class sets it and thus lets
the transport class control the user-initiated scanning.  As this
plugs the hole about user-initiated scanning the target_parent hook
goes away and we rely on callers of the scanning routines to do
something sensible.

For SAS this meant I had to switch from a spinlock to a mutex to
synchronize the topology linked lists, in FC they were completely
unsynchronized which seems wrong.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 2 insertions, 14 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index edcd80b749c1..752fb5da3de4 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -334,19 +334,6 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
         struct scsi_target *starget;
         struct scsi_target *found_target;
 
-        /*
-         * Obtain the real parent from the transport. The transport
-         * is allowed to fail (no error) if there is nothing at that
-         * target id.
-         */
-        if (shost->transportt->target_parent) {
-                spin_lock_irqsave(shost->host_lock, flags);
-                parent = shost->transportt->target_parent(shost, channel, id);
-                spin_unlock_irqrestore(shost->host_lock, flags);
-                if (!parent)
-                        return NULL;
-        }
-
         starget = kmalloc(size, GFP_KERNEL);
         if (!starget) {
                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
@@ -1283,8 +1270,9 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
         struct scsi_device *sdev;
         struct device *parent = &shost->shost_gendev;
         int res;
-        struct scsi_target *starget = scsi_alloc_target(parent, channel, id);
+        struct scsi_target *starget;
 
+        starget = scsi_alloc_target(parent, channel, id);
         if (!starget)
                 return ERR_PTR(-ENOMEM);