Re: [PATCH v2 1/2] staging: r8188eu: Use usb_control_msg_recv/send() in usbctrl_vendorreq()

From: Phillip Potter
Date: Tue Aug 24 2021 - 18:16:42 EST

On Tue, 24 Aug 2021 at 16:24, Fabio M. De Francesco
<fmdefrancesco@xxxxxxxxx> wrote:
>
> 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@xxxxxxxxxxxxxxxxxxx>
> > > Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
> > > ---
> > >
> > > v1->v2: According to suggestions by Christophe JAILLET
> > > <christophe.jaillet@xxxxxxxxxx>, remove 'pipe' and pass an explicit 0
> > > to the new API. According to suggestions by Pavel Skripkin
> > > <paskripkin@xxxxxxxxx>, 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@xxxxxxxxxxxxxxxx>
> > > 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
> >
>
>
>
>

Happy to help - might be worth waiting for staging-testing to have
more patches merged in and rebasing after that.

Regards,
Phil