linux-kernel - Re: [PATCH char-misc-next v2 2/8] misc: mic: add a bus driver for virtual MIC devices

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Date:	Thu, 10 Jul 2014 09:43:42 -0700
From:	Sudeep Dutt <sudeep.dutt@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	sudeep.dutt@...el.com, Dan Williams <dan.j.williams@...el.com>,
	Siva Yerramreddy <yshivakrishna@...il.com>,
	Ashutosh Dixit <ashutosh.dixit@...el.com>,
	Nikhil Rao <nikhil.rao@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH char-misc-next v2 2/8] misc: mic: add a bus driver for
 virtual MIC devices

On Wed, 2014-07-09 at 17:42 -0700, Greg Kroah-Hartman wrote:
> On Thu, May 29, 2014 at 02:23:59PM -0700, Sudeep Dutt wrote:
> > +/**
> > + * mbus_device - representation of a device using mbus
> > + * @priv: private pointer for the driver's use.
> > + * @mmio_va: virtual address of mmio space
> > + * @hw_ops: the hardware ops supported by this device.
> > + * @id: the device type identification (used to match it with a driver).
> > + * @dev: underlying device.
> > + * be used to communicate with.
> > + * @index: unique position on the mbus bus
> > + */
> > +struct mbus_device {
> > +	void *priv;
> 
> What's wrong with the built-in "private" pointer that struct device has?
> That is why it is there...
> 

We were using both mbus_device priv and the device driver_data fields
unnecessarily. I have a patch which gets rid of the mbus_device priv
field and uses only the device driver_data field via
dev_set/get_drvdata(..). The next revision of the patch series will have
this cleaned up.

Thanks for the review!

Sudeep Dutt

> > +	void __iomem *mmio_va;
> > +	struct mbus_hw_ops *hw_ops;
> > +	struct mbus_device_id id;
> > +	struct device dev;
> > +	int index;
> > +};
> 


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