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SubjectRe: [PATCH RFC] staging: r8188eu: Use usb_control_msg_recv/send() in usbctrl_vendorreq()
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On 8/23/21 2:02 AM, 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.
>
> This patch is an RFC for different reasons:
>
> 1) I'm not sure if it is needed: while Greg Kroah-Hartman suggested to
> use the new API in a message to a thread that was about a series of patches
> submitted by Pavel Skripkin (who decided to not use it), I cannot explain
> if and why the driver would benefit from this patch.
> 2) I have doubts about the sematic of the API I use here, so I'd like to
> know whether or not I'm using them properly.
> 3) At the moment I cannot test the driver because I don't have my device
> with me.
> 4) This patch could probably lead to a slight change in some lines of
> Pavel's series (for sure in usb_read*()).
>
> I'd like to hear from the Maintainers and other interested people if this
> patch is worth to be considered and, in this case, if there are suggestions
> for the purpose to improve it.
>
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
> ---
> drivers/staging/r8188eu/hal/usb_ops_linux.c | 19 ++++++++++---------
> 1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
> index 6a0a24acf292..9e290c1cc449 100644
> --- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
> +++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
> @@ -15,7 +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;
> + u8 pipe;
> int status = 0;
> u8 reqtype;

I think, we can pass REALTEK_USB_VENQT_{READ,WRITE} directly as
requesttype argument and get rid of u8 reqtype. + we can define these
macros:

#define
usbctrl_vendor_read(...) usbctrl_vendorreq(...,REALTEK_USB_VENQT_READ)


#define
usbctrl_vendor_write() usbctrl_vendorreq(...,REALTEK_USB_VENQT_WRITE)


This will make code more nice, IMO :)


(Sorry for this formatting, my email client disabled "paste without
formatting" option)

> u8 *pIo_buf;
> @@ -47,19 +47,20 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
> 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, pipe, REALTEK_USB_VENQT_CMD_REQ,
> + reqtype, 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);

I guess, this memcpy is needed, since we want to send data from pdata


> + status = usb_control_msg_send(udev, pipe, REALTEK_USB_VENQT_CMD_REQ,
> + reqtype, 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);
>


With regards,
Pavel Skripkin

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