linux-kernel - [PATCH v2 1/2] staging: r8188eu: Use usb_control_msg_recv/send() in usbctrl

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Date:   Tue, 24 Aug 2021 16:28:22 +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,
        Pavel Skripkin <paskripkin@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: [PATCH v2 1/2] staging: r8188eu: Use usb_control_msg_recv/send() in usbctrl_vendorreq()

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;
 	}
 release_mutex:
-- 
2.32.0