linux-kernel - Re: [PATCH 10/21] Staging: hv: Cleanup root device handling

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Date:	Mon, 14 Mar 2011 12:33:33 -0700
From:	Greg KH <greg@...ah.com>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Mike Sterling <mike.sterling@...rosoft.com>,
	Abhishek Kane <v-abkane@...rosoft.com>
Subject: Re: [PATCH 10/21] Staging: hv: Cleanup root device handling

On Thu, Mar 10, 2011 at 02:08:06PM -0800, K. Y. Srinivasan wrote:
> Now we can complete the cleanup of the root device
> management. Use the preferred APIs for creating and
> managing the root device. As part of this cleanup get rid
> of the root device object from vmbus_driver_context.

I don't understand, what is the "root device"?

The hyper-v "bus controller"?

> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Signed-off-by: Mike Sterling <mike.sterling@...rosoft.com>
> Signed-off-by: Abhishek Kane <v-abkane@...rosoft.com>
> Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
> ---
>  drivers/staging/hv/vmbus_drv.c |  126 ++++++----------------------------------
>  1 files changed, 18 insertions(+), 108 deletions(-)
> 
> diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
> index b473f46..8b9394a 100644
> --- a/drivers/staging/hv/vmbus_drv.c
> +++ b/drivers/staging/hv/vmbus_drv.c
> @@ -19,6 +19,7 @@
>   *   Hank Janssen  <hjanssen@...rosoft.com>
>   */
>  #include <linux/init.h>
> +#include <linux/err.h>
>  #include <linux/module.h>
>  #include <linux/device.h>
>  #include <linux/irq.h>
> @@ -40,6 +41,8 @@
>  #define VMBUS_IRQ		0x5
>  #define VMBUS_IRQ_VECTOR	IRQ5_VECTOR
>  
> +static struct device *root_dev; /* Root device */

This shouldn't be a "raw" struct device, should it?  It should be of a
type that shows exactly what it is.  Is it a hyper_v device that talks
on the bus?

Or is it a "platform" device that controls all of the devices on the
bus, and as such should be the "root" device of the bus tree?

confused,

greg k-h
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