linux-kernel - Re: [PATCH] scsi: libsas: Directly kick-off EH when ATA device fell off

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Date:   Fri, 16 Dec 2022 11:53:52 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     Xingui Yang <yangxingui@...wei.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <john.g.garry@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <prime.zeng@...ilicon.com>,
        <kangfenglong@...wei.com>
Subject: Re: [PATCH] scsi: libsas: Directly kick-off EH when ATA device fell
 off

Hi Xingui,

On 2022/12/16 11:29, Xingui Yang wrote:
> If the ATA device fell off, call sas_ata_device_link_abort() directly and
> mark all outstanding QCs as failed and kick-off EH Immediately. This avoids
> having to wait for block layer timeouts.
> 

Why does ATA device need this special operation? SAS device does not 
have to wait for block layer timeouts?

Thanks,
Jason

> Signed-off-by: Xingui Yang <yangxingui@...wei.com>
> ---
>   drivers/scsi/libsas/sas_discover.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
> index d5bc1314c341..bd22741daa99 100644
> --- a/drivers/scsi/libsas/sas_discover.c
> +++ b/drivers/scsi/libsas/sas_discover.c
> @@ -362,6 +362,11 @@ static void sas_destruct_ports(struct asd_sas_port *port)
>   
>   void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
>   {
> +	if (test_bit(SAS_DEV_GONE, &dev->state) &&
> +	    (dev->dev_type == SAS_SATA_DEV ||
> +	    (dev->tproto & SAS_PROTOCOL_STP)))
> +		sas_ata_device_link_abort(dev, false);
> +
>   	if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
>   	    !list_empty(&dev->disco_list_node)) {
>   		/* this rphy never saw sas_rphy_add */
>