linux-kernel - Re: [Xen-devel] [PATCH 1/3] xen: mark pvscsi frontend request consumed only after last read

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Date:	Fri, 30 Jan 2015 11:47:14 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Juergen Gross" <JGross@...e.com>
Cc:	<david.vrabel@...rix.com>,
	"xen-devel" <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>, <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/3] xen: mark pvscsi frontend request
 consumed only after last read

>>> On 30.01.15 at 12:21, <JGross@...e.com> wrote:
> @@ -734,11 +734,11 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
>  		if (!pending_req)
>  			return 1;
>  
> -		ring_req = RING_GET_REQUEST(ring, rc);
> +		memcpy(&ring_req, RING_GET_REQUEST(ring, rc), sizeof(ring_req));

I'd recommend the type safe *ring_req = *RING_GET_REQUEST(ring, rc)
here.

>  		ring->req_cons = ++rc;
>  
> -		act = ring_req->act;
> -		err = prepare_pending_reqs(info, ring_req, pending_req);
> +		act = ring_req.act;

Is this helper variable then still needed?

Jan

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