linux-kernel - RE: [PATCH v2 1/3] scsi: ufs: remove max_t in ufs_get_device

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Message-ID: <SN6PR04MB46402C75D4CBDA85A3628BB5FC8E0@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Thu, 28 May 2020 13:41:11 +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 1/3] scsi: ufs: remove max_t in ufs_get_device_desc

 
> 
> From: Bean Huo <beanhuo@...ron.com>
> 
> For the UFS device, the maximum descriptor size is 255, max_t called in
> ufs_get_device_desc() is useless.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
Acked-by: Avri Altman <avri.altman@....com>

> ---
>  drivers/scsi/ufs/ufshcd.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index aca50ed39844..0f8c7e05df29 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6881,8 +6881,7 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
>         u8 *desc_buf;
>         struct ufs_dev_info *dev_info = &hba->dev_info;
> 
> -       buff_len = max_t(size_t, hba->desc_size.dev_desc,
> -                        QUERY_DESC_MAX_SIZE + 1);
> +       buff_len = QUERY_DESC_MAX_SIZE + 1;
So why the +1?
Originally it was used for the '\0' terminator, which is not needed anymore.