linux-kernel - RE: [PATCH 2/2] scsi: storvsc: Use the specified target ID in device lookup

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Message-ID: <BY2PR0301MB165444FAB69D52C96AB052ADA0CA0@BY2PR0301MB1654.namprd03.prod.outlook.com>
Date:	Tue, 12 Jan 2016 01:04:35 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Hannes Reinecke <hare@...e.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>
Subject: RE: [PATCH 2/2] scsi: storvsc: Use the specified target ID in device
 lookup



> -----Original Message-----
> From: Hannes Reinecke [mailto:hare@...e.de]
> Sent: Sunday, January 10, 2016 11:10 PM
> To: KY Srinivasan <kys@...rosoft.com>; gregkh@...uxfoundation.org; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; ohering@...e.com;
> jbottomley@...allels.com; hch@...radead.org; linux-scsi@...r.kernel.org;
> apw@...onical.com; vkuznets@...hat.com; jasowang@...hat.com;
> martin.petersen@...cle.com
> Subject: Re: [PATCH 2/2] scsi: storvsc: Use the specified target ID in device
> lookup
> 
> On 01/09/2016 06:51 AM, K. Y. Srinivasan wrote:
> > The current code assumes that there is only one target in device lookup.
> > Fix this bug. This will alow us to correctly handle hot reomoval of LUNs.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > ---
> >   drivers/scsi/storvsc_drv.c |    6 ++++--
> >   1 files changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> > index 622f64a..5faf357 100644
> > --- a/drivers/scsi/storvsc_drv.c
> > +++ b/drivers/scsi/storvsc_drv.c
> > @@ -479,6 +479,7 @@ struct storvsc_scan_work {
> >   	struct work_struct work;
> >   	struct Scsi_Host *host;
> >   	uint lun;
> > +	uint tgt_id;
> >   };
> >
> >   static void storvsc_device_scan(struct work_struct *work)
> > @@ -490,7 +491,7 @@ static void storvsc_device_scan(struct work_struct
> *work)
> >   	wrk = container_of(work, struct storvsc_scan_work, work);
> >   	lun = wrk->lun;
> >
> > -	sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
> > +	sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, lun);
> >   	if (!sdev)
> >   		goto done;
> >   	scsi_rescan_device(&sdev->sdev_gendev);
> > @@ -541,7 +542,7 @@ static void storvsc_remove_lun(struct work_struct
> *work)
> >   	if (!scsi_host_get(wrk->host))
> >   		goto done;
> >
> > -	sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
> > +	sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);
> >
> >   	if (sdev) {
> >   		scsi_remove_device(sdev);
> > @@ -941,6 +942,7 @@ static void storvsc_handle_error(struct
> vmscsi_request *vm_srb,
> >
> >   	wrk->host = host;
> >   	wrk->lun = vm_srb->lun;
> > +	wrk->tgt_id = vm_srb->target_id;
> >   	INIT_WORK(&wrk->work, process_err_fn);
> >   	schedule_work(&wrk->work);
> >   }
> >
> As a side note, are these really 32-bit values?
> Both the LUN and the target?

No, these are 8 bit values as communicated in the vmscsi_request.

Regards,

K. Y


> 
> Cheers,
> 
> Hannes
> --
> Dr. Hannes Reinecke		               zSeries & Storage
> hare@...e.de			               +49 911 74053 688
> SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
> HRB 21284 (AG Nürnberg)