linux-kernel - Re: [PATCH 2/6] scsi: hisi_sas: Use sas_task_find

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Date:   Thu, 29 Sep 2022 11:11:34 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, jinpu.wang@...ud.ionos.com,
        damien.lemoal@....com
Cc:     hare@...e.de, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com,
        ipylypiv@...gle.com, changyuanl@...gle.com, hch@....de
Subject: Re: [PATCH 2/6] scsi: hisi_sas: Use sas_task_find_rq()

On 9/28/22 21:27, John Garry wrote:
> Use sas_task_find_rq() to lookup the request per task for its driver tag.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>

Looks good, modulo the question below.

Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

> ---
>  drivers/scsi/hisi_sas/hisi_sas_main.c | 26 ++++++++------------------
>  1 file changed, 8 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
> index 4c37ae9eb6b6..1011dffed51f 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_main.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
> @@ -177,13 +177,13 @@ static void hisi_sas_slot_index_set(struct hisi_hba *hisi_hba, int slot_idx)
>  }
>  
>  static int hisi_sas_slot_index_alloc(struct hisi_hba *hisi_hba,
> -				     struct scsi_cmnd *scsi_cmnd)
> +				     struct request *rq)
>  {
>  	int index;
>  	void *bitmap = hisi_hba->slot_index_tags;
>  
> -	if (scsi_cmnd)
> -		return scsi_cmd_to_rq(scsi_cmnd)->tag;
> +	if (rq)
> +		return rq->tag;
>  
>  	spin_lock(&hisi_hba->lock);
>  	index = find_next_zero_bit(bitmap, hisi_hba->slot_index_count,
> @@ -461,11 +461,11 @@ static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags)
>  	struct asd_sas_port *sas_port = device->port;
>  	struct hisi_sas_device *sas_dev = device->lldd_dev;
>  	bool internal_abort = sas_is_internal_abort(task);
> -	struct scsi_cmnd *scmd = NULL;
>  	struct hisi_sas_dq *dq = NULL;
>  	struct hisi_sas_port *port;
>  	struct hisi_hba *hisi_hba;
>  	struct hisi_sas_slot *slot;
> +	struct request *rq = NULL;

Do you really need the NULL initialization here ?

>  	struct device *dev;
>  	int rc;
>  
> @@ -520,22 +520,12 @@ static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags)
>  				return -ECOMM;
>  		}
>  
> -		if (task->uldd_task) {
> -			struct ata_queued_cmd *qc;
> -
> -			if (dev_is_sata(device)) {
> -				qc = task->uldd_task;
> -				scmd = qc->scsicmd;
> -			} else {
> -				scmd = task->uldd_task;
> -			}
> -		}
> -
> -		if (scmd) {
> +		rq = sas_task_find_rq(task);
> +		if (rq) {
>  			unsigned int dq_index;
>  			u32 blk_tag;
>  
> -			blk_tag = blk_mq_unique_tag(scsi_cmd_to_rq(scmd));
> +			blk_tag = blk_mq_unique_tag(rq);
>  			dq_index = blk_mq_unique_tag_to_hwq(blk_tag);
>  			dq = &hisi_hba->dq[dq_index];
>  		} else {
> @@ -580,7 +570,7 @@ static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags)
>  	if (!internal_abort && hisi_hba->hw->slot_index_alloc)
>  		rc = hisi_hba->hw->slot_index_alloc(hisi_hba, device);
>  	else
> -		rc = hisi_sas_slot_index_alloc(hisi_hba, scmd);
> +		rc = hisi_sas_slot_index_alloc(hisi_hba, rq);
>  
>  	if (rc < 0)
>  		goto err_out_dif_dma_unmap;

-- 
Damien Le Moal
Western Digital Research