linux-kernel - Re: [PATCH] scsi:libsas: Simplify sas_queue

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Date:   Wed, 30 Aug 2023 20:52:36 +0800
From:   "haowenchao (C)" <haowenchao2@...wei.com>
To:     John Garry <john.g.garry@...cle.com>,
        Jason Yan <yanaijie@...wei.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Damien Le Moal <dlemoal@...nel.org>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <louhongxiang@...wei.com>
Subject: Re: [PATCH] scsi:libsas: Simplify sas_queue_reset and remove unused
 code

On 2023/7/29 18:24, Wenchao Hao wrote:
> sas_queue_reset is always called with param "wait" set to 0, so
> remove it from this function's param list. And remove unused
> function sas_wait_eh.
> 

Ping...

> Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
> ---
>   drivers/scsi/libsas/sas_scsi_host.c | 41 +++--------------------------
>   1 file changed, 3 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
> index 94c5f14f3c16..3f01e77eaee3 100644
> --- a/drivers/scsi/libsas/sas_scsi_host.c
> +++ b/drivers/scsi/libsas/sas_scsi_host.c
> @@ -387,37 +387,7 @@ struct sas_phy *sas_get_local_phy(struct domain_device *dev)
>   }
>   EXPORT_SYMBOL_GPL(sas_get_local_phy);
>   
> -static void sas_wait_eh(struct domain_device *dev)
> -{
> -	struct sas_ha_struct *ha = dev->port->ha;
> -	DEFINE_WAIT(wait);
> -
> -	if (dev_is_sata(dev)) {
> -		ata_port_wait_eh(dev->sata_dev.ap);
> -		return;
> -	}
> - retry:
> -	spin_lock_irq(&ha->lock);
> -
> -	while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
> -		prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
> -		spin_unlock_irq(&ha->lock);
> -		schedule();
> -		spin_lock_irq(&ha->lock);
> -	}
> -	finish_wait(&ha->eh_wait_q, &wait);
> -
> -	spin_unlock_irq(&ha->lock);
> -
> -	/* make sure SCSI EH is complete */
> -	if (scsi_host_in_recovery(ha->core.shost)) {
> -		msleep(10);
> -		goto retry;
> -	}
> -}
> -
> -static int sas_queue_reset(struct domain_device *dev, int reset_type,
> -			   u64 lun, int wait)
> +static int sas_queue_reset(struct domain_device *dev, int reset_type, u64 lun)
>   {
>   	struct sas_ha_struct *ha = dev->port->ha;
>   	int scheduled = 0, tries = 100;
> @@ -425,8 +395,6 @@ static int sas_queue_reset(struct domain_device *dev, int reset_type,
>   	/* ata: promote lun reset to bus reset */
>   	if (dev_is_sata(dev)) {
>   		sas_ata_schedule_reset(dev);
> -		if (wait)
> -			sas_ata_wait_eh(dev);
>   		return SUCCESS;
>   	}
>   
> @@ -444,9 +412,6 @@ static int sas_queue_reset(struct domain_device *dev, int reset_type,
>   		}
>   		spin_unlock_irq(&ha->lock);
>   
> -		if (wait)
> -			sas_wait_eh(dev);
> -
>   		if (scheduled)
>   			return SUCCESS;
>   	}
> @@ -499,7 +464,7 @@ int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
>   	struct sas_internal *i = to_sas_internal(host->transportt);
>   
>   	if (current != host->ehandler)
> -		return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
> +		return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun);
>   
>   	int_to_scsilun(cmd->device->lun, &lun);
>   
> @@ -522,7 +487,7 @@ int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
>   	struct sas_internal *i = to_sas_internal(host->transportt);
>   
>   	if (current != host->ehandler)
> -		return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
> +		return sas_queue_reset(dev, SAS_DEV_RESET, 0);
>   
>   	if (!i->dft->lldd_I_T_nexus_reset)
>   		return FAILED;