linux-kernel - Re: [PATCH v4 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target

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Date:	Fri, 15 Apr 2016 11:24:02 +0800
From:	Xiong Zhou <jencce.kernel@...il.com>
To:	Johannes Thumshirn <jthumshirn@...e.de>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
	"Ewan D. Milne" <emilne@...hat.com>,
	Hannes Reinecke <hare@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	linux-scsi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH v4 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state

On Wed, Apr 13, 2016 at 4:19 PM, Johannes Thumshirn <jthumshirn@...e.de> wrote:
> Hi Xiong
> Sorry for the late reply
>
> On Dienstag, 12. April 2016 21:01:53 CEST Xiong Zhou wrote:
>> How about this?
>>
>> drivers/scsi/scsi_scan: mark STARGET_REMOVE state before destroy
>>
>> Signed-off-by: Xiong Zhou <jencce.kernel@...il.com>
>> ---
>>  drivers/scsi/scsi_scan.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
>> index 27df7e7..21092e5 100644
>> --- a/drivers/scsi/scsi_scan.c
>> +++ b/drivers/scsi/scsi_scan.c
>> @@ -395,6 +395,8 @@ static void scsi_target_reap_ref_release(struct kref *kref)
>>   transport_remove_device(&starget->dev);
>>   device_del(&starget->dev);
>>   }
>> +
>> + starget->state = STARGET_REMOVE;
>>   scsi_target_destroy(starget);
>>  }
>
> The only scsi_target_reap_ref_release() caller is scsi_target_reap_ref_put(),
> which in turn is only called by scsi_target_reap(). scsi_target_reap()'s only
> callers are scsi_remove_target()/__scsi_remove_target(), which set the
> STARGET_REMOVE state and
>
> __scsi_add_device()
> scsi_get_host_dev()
> __scsi_scan_target()
>
> Which I'm currently investiganting (in parallel to reproducing the bug).

Thanks !

--
Xiong

>
>>
>> @@ -465,6 +467,7 @@ static struct scsi_target
>> *scsi_alloc_target(struct device *parent,
>>   dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
>>   /* don't want scsi_target_reap to do the final
>>   * put because it will be under the host lock */
>> + starget->state = STARGET_REMOVE;
>>   scsi_target_destroy(starget);
>>   return NULL;
>>   }
>
> Here starget->state is STARGET_CREATED and the assertion is already aware of
> this state transitoin. IOTW this /shouldn't/ be needed.
>
>
> --
> Johannes Thumshirn                                                                                Storage
> jthumshirn@...e.de                                                             +49 911 74053 689
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