linux-kernel - RE: [PATCH 003/117] Staging: hv: Add struct hv_vmbus_device_id to mod

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Message-ID: <6E21E5352C11B742B20C142EB499E048081B236E@TK5EX14MBXC126.redmond.corp.microsoft.com>
Date:	Wed, 24 Aug 2011 00:44:38 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <greg@...ah.com>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH 003/117] Staging: hv: Add struct hv_vmbus_device_id to
 mod_devicetable.h



> -----Original Message-----
> From: Greg KH [mailto:greg@...ah.com]
> Sent: Tuesday, August 23, 2011 6:42 PM
> To: KY Srinivasan
> Cc: gregkh@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 003/117] Staging: hv: Add struct hv_vmbus_device_id to
> mod_devicetable.h
> 
> On Fri, Jul 15, 2011 at 10:45:51AM -0700, K. Y. Srinivasan wrote:
> > In preparation for implementing vmbus aliases for auto-loading
> > Hyper-V drivers, define vmbus specific device ID.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > ---
> >  include/linux/mod_devicetable.h |    7 +++++++
> >  1 files changed, 7 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/linux/mod_devicetable.h
> b/include/linux/mod_devicetable.h
> > index ae28e93..5a12377 100644
> > --- a/include/linux/mod_devicetable.h
> > +++ b/include/linux/mod_devicetable.h
> > @@ -405,6 +405,13 @@ struct virtio_device_id {
> >  };
> >  #define VIRTIO_DEV_ANY_ID	0xffffffff
> >
> > +/*
> > + * For Hyper-V devices we use the device guid as the id.
> > + */
> > +struct hv_vmbus_device_id {
> > +	__u8 guid[16];
> > +};
> 
> Why do you not need a driver_data pointer here?  Are you sure you aren't
> ever going to need it in the future?  Hint, I think you will...

I am not sure I am following you here; the guid is the device ID and it is 
guaranteed to remain the same. What is the driver _data pointer here 
you are referring to here.  While some device id have the _data pointer,
there are others that don't - for instance struct virtio_device_id. In 
our case, I am not sure how I would use this private pointer.

Regards,

K. Y
> 
> greg k-h

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