Re: [PATCH v3 1/4] scsi: add ability to adjust module reference for scsi host

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On 01/11/2015 02:50 PM, Akinobu Mita wrote:
> While accessing a scsi_device, the use count of the underlying LLDD module
> is incremented.  The module reference is retrieved through .module field of
> struct scsi_host_template.
> 
> This mapping between scsi_device and underlying LLDD module works well
> except ufs, unusual usb storage drivers, and sub drivers for esp_scsi.
> These drivers consist with core driver and actual LLDDs, and
> scsi_host_template is defined in the core driver.  So the actual LLDDs can
> be unloaded even if the scsi_device is being accessed.
> 
> This adds .module field in struct Scsi_Host and let the module reference
> be retrieved though it instead of struct scsi_host_template.  This allows
> the actual LLDDs adjust module reference.
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
> Cc: Vinayak Holikatti <vinholikatti@xxxxxxxxx>
> Cc: Dolev Raviv <draviv@xxxxxxxxxxxxxx>
> Cc: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx>
> Cc: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx>
> Cc: Matthew Dharm <mdharm-usb@xxxxxxxxxxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-usb@xxxxxxxxxxxxxxx
> Cc: usb-storage@xxxxxxxxxxxxxxxxxxxxxxxx
> Cc: linux-scsi@xxxxxxxxxxxxxxx

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@xxxxxxx			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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