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Date: Tue, 24 Aug 2021 17:23:59 +0200
From: "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To: 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,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Pavel Skripkin <paskripkin@...il.com>
Subject: Re: [PATCH v2 1/2] staging: r8188eu: Use usb_control_msg_recv/send() in usbctrl_vendorreq()
On Tuesday, August 24, 2021 4:35:38 PM CEST Pavel Skripkin wrote:
> On 8/24/21 5:28 PM, Fabio M. De Francesco wrote:
> > Replace usb_control_msg() with the new usb_control_msg_recv() and
> > usb_control_msg_send() API of USB Core in usbctrl_vendorreq().
> > Remove no more needed variables. Move out of an if-else block
> > some code that it is no more dependent on status < 0. Remove
> > redundant code depending on status > 0 or status == len.
> >
> > Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> > ---
> >
> > v1->v2: According to suggestions by Christophe JAILLET
> > <christophe.jaillet@...adoo.fr>, remove 'pipe' and pass an explicit 0
> > to the new API. According to suggestions by Pavel Skripkin
> > <paskripkin@...il.com>, remove an extra if-else that is no more needed,
> > since status can be 0 and < 0 and there is no 3rd state, like it was before.
> > Many thanks to both them and to Phillip Potter <phil@...lpotter.co.uk>
> > who kindly offered his time for the purpose of testing v1.
> >
> >
> > drivers/staging/r8188eu/hal/usb_ops_linux.c | 45 ++++++++-------------
> > 1 file changed, 17 insertions(+), 28 deletions(-)
> >
> > diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
> > index a93d5cfe4635..13e925d21e00 100644
> > --- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
> > +++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
> > @@ -15,9 +15,7 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
> > struct adapter *adapt = pintfhdl->padapter;
> > struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
> > struct usb_device *udev = dvobjpriv->pusbdev;
> > - unsigned int pipe;
> > int status = 0;
> > - u8 reqtype;
> > u8 *pIo_buf;
> > int vendorreq_times = 0;
> >
> > @@ -44,22 +42,22 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
> > }
> >
> > while (++vendorreq_times <= MAX_USBCTRL_VENDORREQ_TIMES) {
> > - memset(pIo_buf, 0, len);
> > -
> > if (requesttype == 0x01) {
> > - pipe = usb_rcvctrlpipe(udev, 0);/* read_in */
> > - reqtype = REALTEK_USB_VENQT_READ;
> > + status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
> > + REALTEK_USB_VENQT_READ, value,
> > + REALTEK_USB_VENQT_CMD_IDX, pIo_buf,
> > + len, RTW_USB_CONTROL_MSG_TIMEOUT,
> > + GFP_KERNEL);
> > } else {
> > - pipe = usb_sndctrlpipe(udev, 0);/* write_out */
> > - reqtype = REALTEK_USB_VENQT_WRITE;
> > memcpy(pIo_buf, pdata, len);
> > + status = usb_control_msg_send(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
> > + REALTEK_USB_VENQT_WRITE, value,
> > + REALTEK_USB_VENQT_CMD_IDX, pIo_buf,
> > + len, RTW_USB_CONTROL_MSG_TIMEOUT,
> > + GFP_KERNEL);
> > }
> >
> > - status = usb_control_msg(udev, pipe, REALTEK_USB_VENQT_CMD_REQ,
> > - reqtype, value, REALTEK_USB_VENQT_CMD_IDX,
> > - pIo_buf, len, RTW_USB_CONTROL_MSG_TIMEOUT);
> > -
> > - if (status == len) { /* Success this control transfer. */
> > + if (!status) { /* Success this control transfer. */
> > rtw_reset_continual_urb_error(dvobjpriv);
> > if (requesttype == 0x01)
> > memcpy(pdata, pIo_buf, len);
> > @@ -68,20 +66,11 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
> > value, (requesttype == 0x01) ? "read" : "write",
> > len, status, *(u32 *)pdata, vendorreq_times);
> >
> > - if (status < 0) {
> > - if (status == (-ESHUTDOWN) || status == -ENODEV) {
> > - adapt->bSurpriseRemoved = true;
> > - } else {
> > - struct hal_data_8188e *haldata = GET_HAL_DATA(adapt);
> > - haldata->srestpriv.Wifi_Error_Status = USB_VEN_REQ_CMD_FAIL;
> > - }
> > - } else { /* status != len && status >= 0 */
> > - if (status > 0) {
> > - if (requesttype == 0x01) {
> > - /* For Control read transfer, we have to copy the read data from pIo_buf to pdata. */
> > - memcpy(pdata, pIo_buf, len);
> > - }
> > - }
> > + if (status == (-ESHUTDOWN) || status == -ENODEV) {
> > + adapt->bSurpriseRemoved = true;
> > + } else {
> > + struct hal_data_8188e *haldata = GET_HAL_DATA(adapt);
> > + haldata->srestpriv.Wifi_Error_Status = USB_VEN_REQ_CMD_FAIL;
> > }
> >
> > if (rtw_inc_and_chk_continual_urb_error(dvobjpriv)) {
> > @@ -92,7 +81,7 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
> > }
> >
> > /* firmware download is checksumed, don't retry */
> > - if ((value >= FW_8188E_START_ADDRESS && value <= FW_8188E_END_ADDRESS) || status == len)
> > + if (value >= FW_8188E_START_ADDRESS && value <= FW_8188E_END_ADDRESS)
> > break;
>
>
> Shouldn't we break the loop when we have received all data? I think,
> status == len should be replaced with !status. Correct me if I am wrong.
Yes, correct. I was about to replace status == len with !status when I've
been interrupted by a phone call and then I forgot to do the work :(
I'll send a v3 this night. Unfortunately now I have to go. While at that
I'll also try to understand why 2/2 cannot apply. Sigh!
> Other changes look good to me, thanks
Thanks to you, Christophe and Philip for all the help you gave.
Regards,
Fabio
> With regards,
> Pavel Skripkin
>
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