linux-kernel - RE: [PATCH v2] wifi: rtw89: debug: fix error code in rtw89_debug_priv_send_h2c

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Date:   Wed, 5 Jul 2023 00:16:58 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Zhang Shurong <zhang_shurong@...mail.com>
CC:     "kvalo@...nel.org" <kvalo@...nel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] wifi: rtw89: debug: fix error code in rtw89_debug_priv_send_h2c_set()



> -----Original Message-----
> From: Zhang Shurong <zhang_shurong@...mail.com>
> Sent: Wednesday, July 5, 2023 12:55 AM
> To: Ping-Ke Shih <pkshih@...ltek.com>
> Cc: kvalo@...nel.org; linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org; Zhang Shurong
> <zhang_shurong@...mail.com>
> Subject: [PATCH v2] wifi: rtw89: debug: fix error code in rtw89_debug_priv_send_h2c_set()
> 
> If there is a failure during rtw89_fw_h2c_raw() rtw89_debug_priv_send_h2c
> should return negative error code instead of a positive value count.
> 
> Fix this bug by returning correct error code.
> 
> The changes in this version:
> - fix some compile error

As Larry mentioned, this should be added after delimiter '---'.

> 
> Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
> 
> update

Also, remove this 'update'.

> ---
>  drivers/net/wireless/realtek/rtw89/debug.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
> index 1db2d59d33ff..a679f79b85ec 100644
> --- a/drivers/net/wireless/realtek/rtw89/debug.c
> +++ b/drivers/net/wireless/realtek/rtw89/debug.c
> @@ -3026,17 +3026,18 @@ static ssize_t rtw89_debug_priv_send_h2c_set(struct file *filp,
>         struct rtw89_debugfs_priv *debugfs_priv = filp->private_data;
>         struct rtw89_dev *rtwdev = debugfs_priv->rtwdev;

Move 'int err = 0' here in reverse X'mas tree order, and use 'int ret = 0' instead,
so people don't need to guess if there is special meaning of 'err', which is just
a regular error code. 

>         u8 *h2c;
> +       int err = 0;
>         u16 h2c_len = count / 2;
> 
>         h2c = rtw89_hex2bin_user(rtwdev, user_buf, count);
>         if (IS_ERR(h2c))
>                 return -EFAULT;
> 
> -       rtw89_fw_h2c_raw(rtwdev, h2c, h2c_len);
> +       err = rtw89_fw_h2c_raw(rtwdev, h2c, h2c_len);
> 
>         kfree(h2c);
> 
> -       return count;
> +       return err ? err : count;
>  }
> 
>  static int
> --
> 2.41.0