linux-kernel - Re: [PATCH 06/59] Staging: hv: blkvsc: Use the newly introduced vmbus ID in the blockvsc driver

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Message-ID: <20110825173624.GA21334@kroah.com>
Date:	Thu, 25 Aug 2011 10:36:24 -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>
Subject: Re: [PATCH 06/59] Staging: hv: blkvsc: Use the newly introduced
 vmbus ID in the blockvsc driver

On Thu, Aug 25, 2011 at 09:48:32AM -0700, K. Y. Srinivasan wrote:
> Use the newly introduced vmbus ID in the blockvsc driver. Also, do
> the associated cleanup.
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>  drivers/staging/hv/blkvsc_drv.c |   23 ++++++++++++++---------
>  1 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
> index 018b293..9b99387 100644
> --- a/drivers/staging/hv/blkvsc_drv.c
> +++ b/drivers/staging/hv/blkvsc_drv.c
> @@ -111,14 +111,6 @@ struct block_device_context {
>  
>  static const char *drv_name = "blkvsc";
>  
> -/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
> -static const uuid_le dev_type = {
> -	.b = {
> -		0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
> -		0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
> -	}
> -};
> -
>  /*
>   * There is a circular dependency involving blkvsc_request_completion()
>   * and blkvsc_do_request().
> @@ -802,10 +794,24 @@ static void blkvsc_request(struct request_queue *queue)
>  	}
>  }
>  
> +static const struct hv_vmbus_device_id id_table[] = {
> +	{
> +		/* IDE guid */
> +		.guid = {
> +			0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
> +			0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
> +		}
> +	},
> +	{
> +		.guid = { }
> +	},
> +};

Ah, so close, and yet, not quite :(

This should look like:

static const struct hv_vmbus_device_id id_table[] = {
	{
		/* IDE guid */
		.guid = {
			0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
			0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
		}
	},
	{ },
};

No need to set the field name to nothing.

Hm, this could all be made even smaller with something like the
USB_DEVICE() macro.  How about this instead:

/* IDE guid */
static const struct hv_vmbus_device_id id_table[] = {
	{ VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
		       0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) },
	{ },
};

That would be easier to read and understand, right?  Half the number of
lines as well, which is always nice.

If so, I'll go make that change here so you don't have to respin these.

thanks,

greg k-h
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