linux-kernel - Re: [PATCH v2 6/9] scsi: ufs: Delete is_init_prefetch from struct ufs

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Message-ID: <125ff67c-bcd5-69e7-2ec8-203b805c246b@acm.org>
Date:   Thu, 16 Jan 2020 20:00:10 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Bean Huo <huobean@...il.com>, alim.akhtar@...sung.com,
        avri.altman@....com, asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, tomas.winkler@...el.com, cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/9] scsi: ufs: Delete is_init_prefetch from struct
 ufs_hba

On 2020-01-16 13:59, Bean Huo wrote:
> From: Bean Huo <beanhuo@...ron.com>
> 
> Without variable is_init_prefetch, the current logic can guarantee
> ufshcd_init_icc_levels() will execute only once, delete it now.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 5 +----
>  drivers/scsi/ufs/ufshcd.h | 2 --
>  2 files changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 44b7c0a44b8d..31b6e2a7c166 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6967,8 +6967,7 @@ static int ufs_lu_add(struct ufs_hba *hba)
>  {
>  	int ret;
>  
> -	if (!hba->is_init_prefetch)
> -		ufshcd_init_icc_levels(hba);
> +	ufshcd_init_icc_levels(hba);
>  
>  	/* Add required well known logical units to scsi mid layer */
>  	ret = ufshcd_scsi_add_wlus(hba);
> @@ -6994,8 +6993,6 @@ static int ufs_lu_add(struct ufs_hba *hba)
>  	scsi_scan_host(hba->host);
>  	pm_runtime_put_sync(hba->dev);
>  
> -	if (!hba->is_init_prefetch)
> -		hba->is_init_prefetch = true;
>  out:
>  	return ret;
>  }

The current code calls ufshcd_init_icc_levels() once per HBA. This patch
changes that into one call per LUN. It seems like the patch description
contradicts the code I see above.

Thanks,

Bart.