[PATCH 3/3] staging: r8188eu: Shorten calls chain of rtw_write8/16/32/N()

Fabio M. De Francesco
2021-09-04T21:29:00Z

Shorten the calls chain of rtw_write8/16/32() down to the actual writes.
For this purpose unify the four usb_write8/16/32/N() into the new
usb_write(); make the latter parameterizable with 'size'; embed most of
the code of usbctrl_vendorreq() into usb_write() and use in it the new
usb_control_msg_send() API of USB Core.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---

v1->v2: Replace parameter REALTEK_USB_VENQT_READ with REALTEK_USB_VENQT_WRITE
in usb_control_msg_send(). More in-depth explanation at
https://lore.kernel.org/lkml/2791328.7pjKATJfGa@localhost.localdomain/T/#m1fc1ab2f7c1f463049ad88d5df5bb1b107b37260

drivers/staging/r8188eu/hal/usb_ops_linux.c | 130 ++++++++------------
1 file changed, 53 insertions(+), 77 deletions(-)

diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
index f9c4fd5a2c53..e31d1b1fdb12 100644
--- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
+++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
@@ -8,76 +8,51 @@
#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 usb_read(struct intf_hdl *intfhdl, u32 addr, void *data, u8 size)
{
- struct adapter *adapt = pintfhdl->padapter;
- struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
+ u16 value = (u16)(addr & 0x0000ffff);
+ struct adapter *adapt = intfhdl->padapter;
+ struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
struct usb_device *udev = dvobjpriv->pusbdev;
- unsigned int pipe;
- int status = 0;
- u8 *pIo_buf;
+ int status;
+ u8 *io_buf;
int vendorreq_times = 0;

- if ((adapt->bSurpriseRemoved) || (adapt->pwrctrlpriv.pnp_bstop_trx)) {
+ if (adapt->bSurpriseRemoved || adapt->pwrctrlpriv.pnp_bstop_trx) {
status = -EPERM;
goto exit;
}

- if (len > MAX_VENDOR_REQ_CMD_SIZE) {
- DBG_88E("[%s] Buffer len error ,vendor request failed\n", __func__);
- status = -EINVAL;
- goto exit;
- }
-
- _enter_critical_mutex(&dvobjpriv->usb_vendor_req_mutex, NULL);
+ mutex_lock(&dvobjpriv->usb_vendor_req_mutex);

/* Acquire IO memory for vendorreq */
- pIo_buf = dvobjpriv->usb_vendor_req_buf;
+ io_buf = dvobjpriv->usb_vendor_req_buf;

- if (!pIo_buf) {
- DBG_88E("[%s] pIo_buf == NULL\n", __func__);
+ if (!io_buf) {
+ DBG_88E("[%s] io_buf == NULL\n", __func__);
status = -ENOMEM;
goto release_mutex;
}

- if (requesttype == REALTEK_USB_VENQT_READ)
- pipe = usb_rcvctrlpipe(udev, 0);/* read_in */
- else
- pipe = usb_sndctrlpipe(udev, 0);/* write_out */
-
while (++vendorreq_times <= MAX_USBCTRL_VENDORREQ_TIMES) {
- if (requesttype == REALTEK_USB_VENQT_READ)
- memset(pIo_buf, 0, len);
- else
- memcpy(pIo_buf, pdata, 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);
-
- if (status == len) { /* Success this control transfer. */
+ status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
+ REALTEK_USB_VENQT_READ, value,
+ REALTEK_USB_VENQT_CMD_IDX, io_buf,
+ size, RTW_USB_CONTROL_MSG_TIMEOUT,
+ GFP_KERNEL);
+ if (!status) { /* Success this control transfer. */
rtw_reset_continual_urb_error(dvobjpriv);
- if (requesttype == REALTEK_USB_VENQT_READ)
- memcpy(pdata, pIo_buf, len);
+ memcpy(data, io_buf, size);
} 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);
-
- 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 == 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);
- }
- }
+ DBG_88E("reg 0x%x, usb %s %u fail, status:%d vendorreq_times:%d\n",
+ value, "read", size, status, vendorreq_times);
+
+ 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)) {
@@ -87,17 +62,18 @@ 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)
+ /* firmware download is checksummed, don't retry */
+ if ((value >= FW_8188E_START_ADDRESS && value <= FW_8188E_END_ADDRESS) || !status)
break;
}
+
release_mutex:
- _exit_critical_mutex(&dvobjpriv->usb_vendor_req_mutex, NULL);
+ mutex_unlock(&dvobjpriv->usb_vendor_req_mutex);
exit:
return status;
}

-static int usb_read(struct intf_hdl *intfhdl, u32 addr, void *data, u8 size)
+static int usb_write(struct intf_hdl *intfhdl, u32 addr, void *data, u8 size)
{
u16 value = (u16)(addr & 0x0000ffff);
struct adapter *adapt = intfhdl->padapter;
@@ -123,15 +99,15 @@ static int usb_read(struct intf_hdl *intfhdl, u32 addr, void *data, u8 size)
goto release_mutex;
}

+ memcpy(io_buf, data, size);
while (++vendorreq_times <= MAX_USBCTRL_VENDORREQ_TIMES) {
- status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
- REALTEK_USB_VENQT_READ, value,
+ status = usb_control_msg_send(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
+ REALTEK_USB_VENQT_WRITE, value,
REALTEK_USB_VENQT_CMD_IDX, io_buf,
size, RTW_USB_CONTROL_MSG_TIMEOUT,
GFP_KERNEL);
if (!status) { /* Success this control transfer. */
rtw_reset_continual_urb_error(dvobjpriv);
- memcpy(data, io_buf, size);
} else { /* error cases */
DBG_88E("reg 0x%x, usb %s %u fail, status:%d vendorreq_times:%d\n",
value, "read", size, status, vendorreq_times);
@@ -199,55 +175,55 @@ u32 rtw_read32(struct adapter *adapter, u32 addr)

int rtw_write8(struct adapter *adapter, u32 addr, u8 val)
{
- struct io_priv *pio_priv = &adapter->iopriv;
- struct intf_hdl *pintfhdl = &pio_priv->intf;
- u16 wvalue = (u16)(addr & 0x0000ffff);
+ struct io_priv *io_priv = &adapter->iopriv;
+ struct intf_hdl *intfhdl = &io_priv->intf;
+ u16 value = (u16)(addr & 0x0000ffff);
int ret;

- ret = usbctrl_vendorreq(pintfhdl, wvalue, &val, 1, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, value, &val, 1);

return RTW_STATUS_CODE(ret);
}

int rtw_write16(struct adapter *adapter, u32 addr, u16 val)
{
- struct io_priv *pio_priv = &adapter->iopriv;
- struct intf_hdl *pintfhdl = &pio_priv->intf;
- u16 wvalue = (u16)(addr & 0x0000ffff);
+ struct io_priv *io_priv = &adapter->iopriv;
+ struct intf_hdl *intfhdl = &io_priv->intf;
+ u16 value = (u16)(addr & 0x0000ffff);
__le32 data = cpu_to_le32(val & 0x0000ffff);
int ret;

- ret = usbctrl_vendorreq(pintfhdl, wvalue, &data, 2, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, value, &data, 2);

return RTW_STATUS_CODE(ret);
}

int rtw_write32(struct adapter *adapter, u32 addr, u32 val)
{
- struct io_priv *pio_priv = &adapter->iopriv;
- struct intf_hdl *pintfhdl = &pio_priv->intf;
- u16 wvalue = (u16)(addr & 0x0000ffff);
+ struct io_priv *io_priv = &adapter->iopriv;
+ struct intf_hdl *intfhdl = &io_priv->intf;
+ u16 value = (u16)(addr & 0x0000ffff);
__le32 data = cpu_to_le32(val);
int ret;

- ret = usbctrl_vendorreq(pintfhdl, wvalue, &data, 4, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, value, &data, 4);

return RTW_STATUS_CODE(ret);
}

-int rtw_writeN(struct adapter *adapter, u32 addr, u32 length, u8 *pdata)
+int rtw_writeN(struct adapter *adapter, u32 addr, u32 length, u8 *data)
{
- struct io_priv *pio_priv = &adapter->iopriv;
- struct intf_hdl *pintfhdl = &pio_priv->intf;
- u16 wvalue = (u16)(addr & 0x0000ffff);
+ struct io_priv *io_priv = &adapter->iopriv;
+ struct intf_hdl *intfhdl = &io_priv->intf;
+ u16 value = (u16)(addr & 0x0000ffff);
u8 buf[VENDOR_CMD_MAX_DATA_LEN] = {0};
int ret;

if (length > VENDOR_CMD_MAX_DATA_LEN)
return -EINVAL;

- memcpy(buf, pdata, length);
- ret = usbctrl_vendorreq(pintfhdl, wvalue, buf, (length & 0xffff), REALTEK_USB_VENQT_WRITE);
+ memcpy(buf, data, length);
+ ret = usb_write(intfhdl, value, buf, (length & 0xffff));

return RTW_STATUS_CODE(ret);
}
--
2.33.0