linux-kernel - Re: [PATCH V2 2/2] scsi: storvsc: Use the specified target ID in device lookup

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Date:	Thu, 28 Jan 2016 09:29:57 +0100
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	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, hare@...e.de
Subject: Re: [PATCH V2 2/2] scsi: storvsc: Use the specified target ID in
 device lookup

On Wed, Jan 27, 2016 at 06:22:45PM -0800, 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>
> Reviewed-by: Alex Ng <alexng@...rosoft.com>
> Tested-by: Vivek Yadav <vyadav@...rosoft.com>
> ---
> 	V2: Made lun and target_id unsigned 8 bit entities - Hannes Reinecke <hare@...e.de>
> 
>  drivers/scsi/storvsc_drv.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index 622f64a..132b168 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -478,19 +478,18 @@ struct hv_host_device {
>  struct storvsc_scan_work {
>  	struct work_struct work;
>  	struct Scsi_Host *host;
> -	uint lun;
> +	u8 lun;
> +	u8 tgt_id;
>  };
>  
>  static void storvsc_device_scan(struct work_struct *work)
>  {
>  	struct storvsc_scan_work *wrk;
> -	uint lun;
>  	struct scsi_device *sdev;
>  
>  	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, wrk->lun);
>  	if (!sdev)
>  		goto done;
>  	scsi_rescan_device(&sdev->sdev_gendev);
> @@ -541,7 +540,7 @@ 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 +940,7 @@ 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);
>  }
> -- 
> 1.7.4.1
> 
> --
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Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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