From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jgarzik@pobox.com>
Subject: Re: [PATCH 16/20] libata: make ata_host_alloc() take care of hpriv
 alloc/free
Date: Tue, 19 Sep 2006 01:45:29 -0400
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To: Tejun Heo <htejun@gmail.com>
Cc: alan@lxorguk.ukuu.org.uk, mlord@pobox.com, albertcc@tw.ibm.com, uchang@tw.ibm.com, forrest.zhao@intel.com, brking@us.ibm.com, linux-ide@vger.kernel.org

Tejun Heo wrote:
> Transfer responsibility to allocate/init hpriv from LLD/port_info to
> host allocation.  All host allocation/prepare routines now
> take @hpriv_hz and initialize host->private_data accordingly.
> hpriv area is aligned to __alignof__(long long) and zeroed.
> 
> As hpriv handling is moved to host allocation, pinfo->private_data
> is removed.  The only user of pinfo->private_data was
> ata_pci_init_one() which is updated to take @hpriv argument directly.
> This change makes port_info carry one less host-wide info - which
> is good because mismatched scope causes confusion and bug
> (e.g. ata_piix private_data init bug).
> 
> Signed-off-by: Tejun Heo <htejun@gmail.com>

A nice model to follow is netdev_priv() and the alloc_netdev() 
allocation code...