linux-kernel - Re: [PATCH 3/6] scsi: pm8001: Remove pm8001_tag

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Message-ID: <8163fce3-5ecb-193d-bec7-abca704e9e07@opensource.wdc.com>
Date:   Thu, 29 Sep 2022 11:13:16 +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
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 3/6] scsi: pm8001: Remove pm8001_tag_init()

On 9/28/22 21:27, John Garry wrote:
> From: Igor Pylypiv <ipylypiv@...gle.com>
> 
> In commit 5a141315ed7c ("scsi: pm80xx: Increase the number of outstanding
> I/O supported to 1024") the pm8001_ha->tags allocation was moved into
> pm8001_init_ccb_tag(). This changed the execution order of allocation.
> pm8001_tag_init() used to be called after the pm8001_ha->tags allocation
> and now it is called before the allocation.
> 
> Before:
> 
> pm8001_pci_probe()
> `--> pm8001_pci_alloc()
>      `--> pm8001_alloc()
>           `--> pm8001_ha->tags = kzalloc(...)
>           `--> pm8001_tag_init(pm8001_ha); // OK: tags are allocated
> 
> After:
> 
> pm8001_pci_probe()
> `--> pm8001_pci_alloc()
> |    `--> pm8001_alloc()
> |         `--> pm8001_tag_init(pm8001_ha); // NOK: tags are not allocated
> |
> `--> pm8001_init_ccb_tag()
>      `-->  pm8001_ha->tags = kzalloc(...) // today it is bitmap_zalloc()
> 
> Since pm8001_ha->tags_num is zero when pm8001_tag_init() is called it does
> nothing. Tags memory is allocated with bitmap_zalloc() so there is no need
> to manually clear each bit with pm8001_tag_free().
> 
> Reviewed-by: Changyuan Lyu <changyuanl@...gle.com>
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
> Signed-off-by: John Garry <john.garry@...wei.com>

Looks good.

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

> ---
>  drivers/scsi/pm8001/pm8001_init.c | 2 --
>  drivers/scsi/pm8001/pm8001_sas.c  | 7 -------
>  drivers/scsi/pm8001/pm8001_sas.h  | 1 -
>  3 files changed, 10 deletions(-)
> 
> diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
> index a0028e130a7e..0edc9857a8bd 100644
> --- a/drivers/scsi/pm8001/pm8001_init.c
> +++ b/drivers/scsi/pm8001/pm8001_init.c
> @@ -436,8 +436,6 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
>  		atomic_set(&pm8001_ha->devices[i].running_req, 0);
>  	}
>  	pm8001_ha->flags = PM8001F_INIT_TIME;
> -	/* Initialize tags */
> -	pm8001_tag_init(pm8001_ha);
>  	return 0;
>  
>  err_out_nodev:
> diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
> index d5ec29f69be3..066dfa9f4683 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.c
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -96,13 +96,6 @@ int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out)
>  	return 0;
>  }
>  
> -void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha)
> -{
> -	int i;
> -	for (i = 0; i < pm8001_ha->tags_num; ++i)
> -		pm8001_tag_free(pm8001_ha, i);
> -}
> -
>  /**
>   * pm8001_mem_alloc - allocate memory for pm8001.
>   * @pdev: pci device.
> diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
> index 8ab0654327f9..9acaadf02150 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.h
> +++ b/drivers/scsi/pm8001/pm8001_sas.h
> @@ -632,7 +632,6 @@ extern struct workqueue_struct *pm8001_wq;
>  
>  /******************** function prototype *********************/
>  int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out);
> -void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha);
>  u32 pm8001_get_ncq_tag(struct sas_task *task, u32 *tag);
>  void pm8001_ccb_task_free(struct pm8001_hba_info *pm8001_ha,
>  			  struct pm8001_ccb_info *ccb);

-- 
Damien Le Moal
Western Digital Research