linux-kernel - Re: [PATCH 4/5] scsi: libsas: check the ata device status by ata_dev

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Date:   Mon, 17 Sep 2018 15:56:46 +0200
From:   Hannes Reinecke <hare@...e.com>
To:     Jason Yan <yanaijie@...wei.com>, martin.petersen@...cle.com,
        jejb@...ux.vnet.ibm.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.garry@...wei.com, zhaohongjiang@...wei.com,
        dan.j.williams@...el.com, jthumshirn@...e.de, hch@....de,
        huangdaode@...ilicon.com, chenxiang66@...ilicon.com,
        miaoxie@...wei.com, Ewan Milne <emilne@...hat.com>,
        Tomas Henzl <thenzl@...hat.com>
Subject: Re: [PATCH 4/5] scsi: libsas: check the ata device status by
 ata_dev_enabled()

On 09/12/2018 10:29 AM, Jason Yan wrote:
> When ata device IDENTIFY failed, the ata device status is
> ATA_DEV_UNKNOWN. The libata reported like:
> 
> [113518.620433] ata5.00: qc timeout (cmd 0xec)
> [113518.653646] ata5.00: failed to IDENTIFY (I/O error, err_mask=0x4)
> 
> But libsas verifies the device status by ata_dev_disabled(), which
> skiped ATA_DEV_UNKNOWN. This will make libsas think the ata device
> probing succeed the device cannot be actually brought up. And even the
> new bcast of this device will be considered as flutter and will not
> probe this device again.
> 
> Change ata_dev_disabled() to !ata_dev_enabled() so that libsas can
> deal with this if the ata device probe failed. New bcasts can let us
> try to probe the device again and bring it up if it is fine to
> IDENTIFY.
> 
> Tested-by: Zhou Yupeng <zhouyupeng1@...wei.com>
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> CC: John Garry <john.garry@...wei.com>
> CC: Johannes Thumshirn <jthumshirn@...e.de>
> CC: Ewan Milne <emilne@...hat.com>
> CC: Christoph Hellwig <hch@....de>
> CC: Tomas Henzl <thenzl@...hat.com>
> CC: Dan Williams <dan.j.williams@...el.com>
> CC: Hannes Reinecke <hare@...e.com>
> ---
>  drivers/scsi/libsas/sas_ata.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
> index 64a958a99f6a..4f6cdf53e913 100644
> --- a/drivers/scsi/libsas/sas_ata.c
> +++ b/drivers/scsi/libsas/sas_ata.c
> @@ -654,7 +654,7 @@ void sas_probe_sata(struct asd_sas_port *port)
>  		/* if libata could not bring the link up, don't surface
>  		 * the device
>  		 */
> -		if (ata_dev_disabled(sas_to_ata_dev(dev)))
> +		if (!ata_dev_enabled(sas_to_ata_dev(dev)))
>  			sas_fail_probe(dev, __func__, -ENODEV);
>  	}
>  
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes