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

[Hannes Reinecke <hare-l3A5Bk7waGM@public.gmane.org>]

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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Cc: Vinayak Holikatti <vinholikatti-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Cc: Dolev Raviv <draviv-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Cc: Sujit Reddy Thumma <sthumma-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Cc: Subhash Jadavani <subhashj-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
> Cc: "James E.J. Bottomley" <JBottomley-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
> Cc: Matthew Dharm <mdharm-usb-JGfshJpz5UybPZpvUQj5UqxOck334EZe@public.gmane.org>
> Cc: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
> Cc: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
> Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Cc: usb-storage-ijkIwGHArpdIPJnuZ7Njw4oP9KaGy4wf@public.gmane.org
> Cc: linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

Reviewed-by: Hannes Reinecke <hare-l3A5Bk7waGM@public.gmane.org>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare-l3A5Bk7waGM@public.gmane.org			               +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)
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html