linux-kernel - Re: [PATCH 1/3] staging: r8188eu: remove _io

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Message-ID: <aec7eb51-721a-d2c1-4eba-c4adbb8265c3@gmail.com>
Date:   Mon, 6 Sep 2021 17:04:42 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] staging: r8188eu: remove _io_ops structure

On 9/6/21 10:49 AM, Dan Carpenter wrote:
> On Sat, Sep 04, 2021 at 05:04:45PM +0200, Fabio M. De Francesco wrote:
>> -static int usb_writeN(struct intf_hdl *pintfhdl, u32 addr, u32 length, u8 *pdata)
>> +int rtw_writeN(struct adapter *adapter, u32 addr, u32 length, u8 *pdata)
>>  {
>> +	struct io_priv *pio_priv = &adapter->iopriv;
>> +	struct intf_hdl *pintfhdl = &pio_priv->intf;
>>  	u16 wvalue = (u16)(addr & 0x0000ffff);
>>  	u8 buf[VENDOR_CMD_MAX_DATA_LEN] = {0};
>> +	int ret;
>>  
>>  	if (length > VENDOR_CMD_MAX_DATA_LEN)
>>  		return -EINVAL;
> 
> The caller treats this negative return as success.
> 

Oh, good catch, thank you so much for pointing it out... This driver 
uses unusual approach for error handling with private _SUCCESS and _FAIL 
macros and I forgot to call RTW_ERROR_CODE :(

>>  
>>  	memcpy(buf, pdata, length);
>> +	ret = usbctrl_vendorreq(pintfhdl, wvalue, buf, (length & 0xffff), REALTEK_USB_VENQT_WRITE);
>>  
>> -	return usbctrl_vendorreq(pintfhdl, wvalue, buf, (length & 0xffff), REALTEK_USB_VENQT_WRITE);
>> +	return RTW_STATUS_CODE(ret);
>>  }
> 
> [ snip ]
> 
> 
>> -void usb_read_port_cancel(struct intf_hdl *pintfhdl)
>> +void rtw_read_port_cancel(struct adapter *adapter)
>>  {
>>  	int i;
>> -	struct recv_buf *precvbuf;
>> -	struct adapter	*padapter = pintfhdl->padapter;
>> -	precvbuf = (struct recv_buf *)padapter->recvpriv.precv_buf;
>> +	struct recv_buf *precvbuf = (struct recv_buf *) adapter->recvpriv.precv_buf;
>>  
>>  	DBG_88E("%s\n", __func__);
>>  
>> -	padapter->bReadPortCancel = true;
>> +	adapter->bReadPortCancel = true;
> 
> In these functions it would be better to rename "padapter" as "adapter"
> in a follow on function.  Keep it the same for now just to make review
> easier.
> 

Ok, will bring old name back in v4. Thank you for review :)




With regards,
Pavel Skripkin