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

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Date:	Mon, 11 Jan 2016 08:09:52 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	"K. Y. 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?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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