From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH v5 05/10] xen/blkfront: negotiate number of
 queues/rings to be used with backend
Date: Mon, 16 Nov 2015 16:27:02 -0500
Message-ID: <20151116212702.GA12823@char.us.oracle.com>
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To: Bob Liu <bob.liu@oracle.com>
Cc: jonathan.davies@citrix.com, felipe.franciosi@citrix.com, rafal.mielniczuk@citrix.com, linux-kernel@vger.kernel.org, xen-devel@lists.xen.org, axboe@fb.com, david.vrabel@citrix.com, avanzini.arianna@gmail.com, roger.pau@citrix.com
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>  /* Common code used when first setting up, and when resuming. */
>  static int talk_to_blkback(struct xenbus_device *dev,
> @@ -1527,10 +1582,9 @@ static int talk_to_blkback(struct xenbus_device *dev,
>  {
>  	const char *message = NULL;
>  	struct xenbus_transaction xbt;
> -	int err, i;
> -	unsigned int max_page_order = 0;
> +	int err;
> +	unsigned int i, max_page_order = 0;
>  	unsigned int ring_page_order = 0;
> -	struct blkfront_ring_info *rinfo;

Why? You end up doing the 'struct blkfront_ring_info' decleration
in two of the loops below?
>  
>  	err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
>  			   "max-ring-page-order", "%u", &max_page_order);
> @@ -1542,7 +1596,8 @@ static int talk_to_blkback(struct xenbus_device *dev,
>  	}
>  
>  	for (i = 0; i < info->nr_rings; i++) {
> -		rinfo = &info->rinfo[i];
> +		struct blkfront_ring_info *rinfo = &info->rinfo[i];
> +

Here..

> @@ -1617,7 +1677,7 @@ again:
>  
>  	for (i = 0; i < info->nr_rings; i++) {
>  		int j;
> -		rinfo = &info->rinfo[i];
> +		struct blkfront_ring_info *rinfo = &info->rinfo[i];

And here?

It is not a big deal but I am curious of why add this change?

> @@ -1717,7 +1789,6 @@ static int blkfront_probe(struct xenbus_device *dev,
>  
>  	mutex_init(&info->mutex);
>  	spin_lock_init(&info->dev_lock);
> -	info->xbdev = dev;

That looks like a spurious change? Ah, I see that we do the same exact
operation earlier in the blkfront_probe.

Let me take this out of this patch and spin it as a seperate patch.