linux-kernel - [PATCH v4 15/18] staging: r8188eu: hal: Clean up usbctrl

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Message-Id: <20210913181002.16651-16-fmdefrancesco@gmail.com>
Date:   Mon, 13 Sep 2021 20:09:59 +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,
        Michael Straube <straube.linux@...il.com>
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Pavel Skripkin <paskripkin@...il.com>
Subject: [PATCH v4 15/18] staging: r8188eu: hal: Clean up usbctrl_vendorreq()

Clean up usbctrl_vendorreq () in usb_ops_linux.c because some
of its code will be reused in this series. This cleanup is in
preparation for shortening the call chains of rtw_read{8,16,32}()
and rtw_write{8,16,32,N}(). More insights about the reasons why at
https://lore.kernel.org/lkml/5319192.FrU0QrjFp7@localhost.localdomain/

Co-developed-by: Pavel Skripkin <paskripkin@...il.com>
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---

v3->v4:
        Make this patch.
v2->v3:
        No changes.
v1->v2:
        No changes.

 drivers/staging/r8188eu/hal/usb_ops_linux.c | 62 +++++++++------------
 1 file changed, 27 insertions(+), 35 deletions(-)

diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
index 117213c9f984..2c7e92085a6e 100644
--- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
+++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
@@ -8,15 +8,15 @@
 #include "../include/recv_osdep.h"
 #include "../include/rtl8188e_hal.h"
 
-static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata, u16 len, u8 requesttype)
+static int usbctrl_vendorreq(struct intf_hdl *intfhdl, u16 value, void *data, u16 len, u8 requesttype)
 {
-	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 *pIo_buf;
+	u8 *io_buf;
+	unsigned int pipe;
 	int vendorreq_times = 0;
+	struct adapter *adapt = intfhdl->padapter;
+	struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
+	struct usb_device *udev = dvobjpriv->pusbdev;
 
 	if ((adapt->bSurpriseRemoved) || (adapt->pwrctrlpriv.pnp_bstop_trx)) {
 		status = -EPERM;
@@ -32,51 +32,44 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
 	mutex_lock(&dvobjpriv->usb_vendor_req_mutex);
 
 	/*  Acquire IO memory for vendorreq */
-	pIo_buf = dvobjpriv->usb_vendor_req_buf;
-
-	if (!pIo_buf) {
-		DBG_88E("[%s] pIo_buf == NULL\n", __func__);
-		status = -ENOMEM;
-		goto release_mutex;
-	}
+	io_buf = dvobjpriv->usb_vendor_req_buf;
 
 	if (requesttype == REALTEK_USB_VENQT_READ)
-		pipe = usb_rcvctrlpipe(udev, 0);/* read_in */
+		/* read in */
+		pipe = usb_rcvctrlpipe(udev, 0);
 	else
-		pipe = usb_sndctrlpipe(udev, 0);/* write_out */
+		/* write out */
+		pipe = usb_sndctrlpipe(udev, 0);
 
 	while (++vendorreq_times <= MAX_USBCTRL_VENDORREQ_TIMES) {
 		if (requesttype == REALTEK_USB_VENQT_READ)
-			memset(pIo_buf, 0, len);
+			memset(io_buf, 0, len);
 		else
-			memcpy(pIo_buf, pdata, len);
+			memcpy(io_buf, data, len);
 
 		status = usb_control_msg(udev, pipe, REALTEK_USB_VENQT_CMD_REQ,
 					 requesttype, value, REALTEK_USB_VENQT_CMD_IDX,
-					 pIo_buf, len, RTW_USB_CONTROL_MSG_TIMEOUT);
+					 io_buf, len, RTW_USB_CONTROL_MSG_TIMEOUT);
 
-		if (status == len) {   /*  Success this control transfer. */
+		if (status == len) {
+			/*  success */
 			rtw_reset_continual_urb_error(dvobjpriv);
 			if (requesttype == REALTEK_USB_VENQT_READ)
-				memcpy(pdata, pIo_buf,  len);
-		} else { /*  error cases */
-			DBG_88E("reg 0x%x, usb %s %u fail, status:%d value=0x%x, vendorreq_times:%d\n",
-				value, (requesttype == REALTEK_USB_VENQT_READ) ? "read" : "write",
-				len, status, *(u32 *)pdata, vendorreq_times);
-
+				memcpy(data, io_buf,  len);
+		} else {
+			/* errors */
 			if (status < 0) {
-				if (status == (-ESHUTDOWN) || status == -ENODEV) {
+				if (status == (-ESHUTDOWN || -ENODEV)) {
 					adapt->bSurpriseRemoved = true;
 				} else {
-					struct hal_data_8188e	*haldata = GET_HAL_DATA(adapt);
+					struct hal_data_8188e *haldata = GET_HAL_DATA(adapt);
 					haldata->srestpriv.wifi_error_status = USB_VEN_REQ_CMD_FAIL;
 				}
-			} else { /*  status != len && status >= 0 */
+			} else {
+				/*  status != len && status >= 0 */
 				if (status > 0) {
-					if (requesttype == REALTEK_USB_VENQT_READ) {
-						/*  For Control read transfer, we have to copy the read data from pIo_buf to pdata. */
-						memcpy(pdata, pIo_buf,  len);
-					}
+					if (requesttype == REALTEK_USB_VENQT_READ)
+						memcpy(data, io_buf,  len);
 				}
 			}
 
@@ -86,12 +79,11 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata,
 			}
 
 		}
-
-		/*  firmware download is checksumed, don't retry */
+		/*  firmware download is checksummed, don't retry */
 		if ((value >= FW_8188E_START_ADDRESS && value <= FW_8188E_END_ADDRESS) || status == len)
 			break;
 	}
-release_mutex:
+
 	mutex_unlock(&dvobjpriv->usb_vendor_req_mutex);
 exit:
 	return status;
-- 
2.33.0