Re: [PATCH 01/16] scsi: libsas: Use enum for response frame DATAPRES field

[chenxiang (M)]

Hi John,


在 2022/1/25 19:32, John Garry 写道:
> As defined in table 126 of the SAS spec 1.1, use an enum for the DATAPRES
> field, which makes reading the code easier.
>
> Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
> ---
>   drivers/scsi/libsas/sas_task.c | 12 +++++++++---
>   1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/scsi/libsas/sas_task.c b/drivers/scsi/libsas/sas_task.c
> index 2966ead1d421..7240fd22b154 100644
> --- a/drivers/scsi/libsas/sas_task.c
> +++ b/drivers/scsi/libsas/sas_task.c
> @@ -7,6 +7,12 @@
>   #include <scsi/sas.h>
>   #include <scsi/libsas.h>
>   
> +enum {
> +	NO_DATA = 0,
> +	RESPONSE_DATA = 1,
> +	SENSE_DATA = 2,
> +};
> +

I find that iu->datapres is also used in other drivers with 0/1/2, and 
maybe it is worth to replace all of them with those enum.

  2    290 
/home/chenxiang/kernel_next/kernel-dev/drivers/scsi/aic94xx/aic94xx_tmf.c 
<<<unknown>>>
             if (ru->datapres == 1)
5   1055 
/home/chenxiang/kernel_next/kernel-dev/drivers/scsi/isci/request.c 
<<<unknown>>>
             if (datapres == 1 || datapres == 2) {
   6   1740 
/home/chenxiang/kernel_next/kernel-dev/drivers/scsi/isci/request.c 
<<<unknown>>>
             if (resp_iu->datapres == 0x01 ||
   7   1741 
/home/chenxiang/kernel_next/kernel-dev/drivers/scsi/isci/request.c 
<<<unknown>>>
                 resp_iu->datapres == 0x02) {
 17   1641 
/home/chenxiang/kernel_next/kernel-dev/drivers/scsi/mvsas/mv_sas.c 
<<<unknown>>>
             iu->datapres = 2;

>   /* fill task_status_struct based on SSP response frame */
>   void sas_ssp_task_response(struct device *dev, struct sas_task *task,
>   			   struct ssp_response_iu *iu)
> @@ -15,11 +21,11 @@ void sas_ssp_task_response(struct device *dev, struct sas_task *task,
>   
>   	tstat->resp = SAS_TASK_COMPLETE;
>   
> -	if (iu->datapres == 0)
> +	if (iu->datapres == NO_DATA)
>   		tstat->stat = iu->status;
> -	else if (iu->datapres == 1)
> +	else if (iu->datapres == RESPONSE_DATA)
>   		tstat->stat = iu->resp_data[3];
> -	else if (iu->datapres == 2) {
> +	else if (iu->datapres == SENSE_DATA) {
>   		tstat->stat = SAS_SAM_STAT_CHECK_CONDITION;
>   		tstat->buf_valid_size =
>   			min_t(int, SAS_STATUS_BUF_SIZE,