linux-kernel - Re: [Xen-devel] [PATCH] xen_pvscsi: reclaim the ring request when mapping data failed

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Date:	Mon, 11 Jul 2016 10:50:44 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, Bin Wu <wu.wubin@...wei.com>,
	<boris.ostrovsky@...cle.com>, <david.vrabel@...rix.com>,
	<jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>,
	<xen-devel@...ts.xenproject.org>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen_pvscsi: reclaim the ring request when
 mapping data failed

On 11/07/16 10:33, Juergen Gross wrote:
> On 11/07/16 04:51, Bin Wu wrote:
>> During scsi command queueing, if mapping data fails, we need to
>> reclaim the failed request. Otherwise, the garbage request will
>> be pushed into the ring for the backend to work.
> 
> Well spotted. There is another instance of this problem in
> scsifront_action_handler(). Would you mind correcting this one, too?

Would it make more sense to advance req_prod_pvt only if the request has
been successfully created?

David

>> Signed-off-by: Bin Wu <wu.wubin@...wei.com>
>> ---
>>  drivers/scsi/xen-scsifront.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
>> index 9dc8687..655163d 100644
>> --- a/drivers/scsi/xen-scsifront.c
>> +++ b/drivers/scsi/xen-scsifront.c
>> @@ -565,6 +565,7 @@ static int scsifront_queuecommand(struct Scsi_Host
>> *shost,
>>      err = map_data_for_request(info, sc, ring_req, shadow);
>>      if (err < 0) {
>>          pr_debug("%s: err %d\n", __func__, err);
>> +        info->ring.req_prod_pvt--;
>>          scsifront_put_rqid(info, rqid);
>>          scsifront_return(info);
>>          spin_unlock_irqrestore(shost->host_lock, flags);
> 
> 
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