RE: [PATCH 1/4] staging: hv: Fix the code depending on structvmbus_driver_context data order

[Haiyang Zhang]

> From: Greg KH [mailto:greg@xxxxxxxxx]
> Sent: Wednesday, February 23, 2011 4:27 PM
> >  struct driver_context {
> >  	struct hv_guid class_id;
> > -
> >  	struct device_driver driver;
> > +	struct hv_driver *hv_drv;
> 
> If you have a pointer to hv_driver, why do you need a full 'struct
> device_driver' here?  That sounds really wrong.
> 
> Actually, having 'struct device_driver' within a structure called
> "driver_context" seems wrong, this should be what 'struct hv_driver'
> really is, right?

The hv_driver contains Hyper-V specific data, like hv_guid. But the
struct driver_context contains data and functions related to Linux
kernel side, such as the struct device_driver defined by kernel. So,
they are kept separately.

(just saw Ky's email, which further explained the layering.)

Thanks,

- Haiyang

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