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 13:23:27 +0100
From:	Juergen Gross <jgross@...e.com>
To:	Jan Beulich <JBeulich@...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 01/30/2015 12:47 PM, Jan Beulich wrote:
>>>> 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.

I think I'll use ring_req = *RING_GET_REQUEST(ring, rc) :-)

>
>>   		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?

No, you're right. Will delete it.


Juergen
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