linux-kernel - RE: [PATCH v2 3/3] scsi: ufs: cleanup ufs initialization path

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Message-ID: <SN6PR04MB4640F8F4B293E6D3980952D5FC8E0@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Thu, 28 May 2020 14:58:22 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <huobean@...il.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 3/3] scsi: ufs: cleanup ufs initialization path

Hi,

> From: Bean Huo <beanhuo@...ron.com>
> 
> At UFS initialization stage, to get the length of the descriptor,
> ufshcd_read_desc_length() being called 6 times.
May I suggest one more clarifying sentence to your commit log:
"Instead, we will capture the descriptor size the first time we'll read it."

>This patch is to
> delete unnecessary reduntant code, remove ufshcd_read_desc_length()
typo: redundant

> and boost UFS initialization.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>

> +       if (desc_id >= QUERY_DESC_IDN_MAX) {
>                 *desc_len = 0;
>                 return -EINVAL;
>         }
if (desc_id == QUERY_DESC_IDN_RFU_0 || desc_id == QUERY_DESC_IDN_RFU_1)
	*desc_len = 0;
else
> +
> +       *desc_len = hba->desc_size[desc_id];
>         return 0;
>  }
>  EXPORT_SYMBOL(ufshcd_map_desc_id_to_length);
> 
> +static void ufshcd_update_desc_length(struct ufs_hba *hba,
> +                                     enum desc_idn desc_id, int desc_len)
desc_len is at most 255 so maybe u8?

> +{
> +       if (hba->desc_size[desc_id] == QUERY_DESC_MAX_SIZE &&
> +           desc_id != QUERY_DESC_IDN_STRING)
> +               hba->desc_size[desc_id] = desc_len;
> +}
> +


Thanks,
Avri