linux-kernel - Re: [PATCH] scsi: libsas: Grab the host lock in sas_ata_device_link

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Date:   Tue, 20 Dec 2022 14:59:14 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     Xingui Yang <yangxingui@...wei.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, niklas.cassel@....com,
        damien.lemoal@...nsource.wdc.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: Grab the host lock in
 sas_ata_device_link_abort()

On 20/12/2022 12:53, Xingui Yang wrote:
> Grab the host lock in sas_ata_device_link_abort() before calling

This is should be the ata port lock, right? I know that the ata comments 
say differently.

> ata_link_abort(), as the comment in ata_link_abort() mentions.
> 

Can you please add a fixes tag?

> Signed-off-by: Xingui Yang <yangxingui@...wei.com>

Reviewed-by: John Garry <john.g.garry@...cle.com>

> ---
>   drivers/scsi/libsas/sas_ata.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
> index f7439bf9cdc6..4f2017b21e6d 100644
> --- a/drivers/scsi/libsas/sas_ata.c
> +++ b/drivers/scsi/libsas/sas_ata.c
> @@ -889,7 +889,9 @@ void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
>   {
>   	struct ata_port *ap = device->sata_dev.ap;
>   	struct ata_link *link = &ap->link;
> +	unsigned long flags;
>   
> +	spin_lock_irqsave(ap->lock, flags);
>   	device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
>   	device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
>   
> @@ -897,6 +899,7 @@ void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
>   	if (force_reset)
>   		link->eh_info.action |= ATA_EH_RESET;
>   	ata_link_abort(link);
> +	spin_unlock_irqrestore(ap->lock, flags);
>   }
>   EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
>