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Subject[PATCH v6 18/19] staging: r8188eu: Shorten calls chains of rtw_write*()
Date
Shorten the calls chains 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>
---
drivers/staging/r8188eu/hal/usb_ops_linux.c | 112 +++++++-------------
1 file changed, 41 insertions(+), 71 deletions(-)

diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
index ef35358cf2d3..656f3a774e48 100644
--- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
+++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
@@ -8,88 +8,60 @@
#include "../include/recv_osdep.h"
#include "../include/rtl8188e_hal.h"

-static int usbctrl_vendorreq(struct intf_hdl *intfhdl, u16 value, void *data, u16 len, u8 requesttype)
+static int usb_read(struct intf_hdl *intfhdl, u16 addr, void *data, u8 size)
{
struct adapter *adapt = intfhdl->padapter;
struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
struct usb_device *udev = dvobjpriv->pusbdev;
- int vendorreq_times = 0;
- unsigned int pipe;
- int status = 0;
- u8 *io_buf;
-
- if ((adapt->bSurpriseRemoved) || (adapt->pwrctrlpriv.pnp_bstop_trx)) {
- status = -EPERM;
- goto exit;
- }
+ int status;
+ u8 *io_buf; /* Pointer to I/O buffer */

- if (len > MAX_VENDOR_REQ_CMD_SIZE) {
- DBG_88E("[%s] Buffer len error ,vendor request failed\n", __func__);
- status = -EINVAL;
- goto exit;
- }
+ if (adapt->bSurpriseRemoved || adapt->pwrctrlpriv.pnp_bstop_trx)
+ return -EPERM;

mutex_lock(&dvobjpriv->usb_vendor_req_mutex);

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

- if (requesttype == REALTEK_USB_VENQT_READ)
- /* read in */
- pipe = usb_rcvctrlpipe(udev, 0);
- else
- /* write out */
- pipe = usb_sndctrlpipe(udev, 0);
-
- while (++vendorreq_times <= MAX_USBCTRL_VENDORREQ_TIMES) {
- if (requesttype == REALTEK_USB_VENQT_READ)
- memset(io_buf, 0, len);
- else
- memcpy(io_buf, data, len);
+ status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
+ REALTEK_USB_VENQT_READ, addr,
+ REALTEK_USB_VENQT_CMD_IDX, io_buf,
+ size, RTW_USB_CONTROL_MSG_TIMEOUT,
+ GFP_KERNEL);

- status = usb_control_msg(udev, pipe, REALTEK_USB_VENQT_CMD_REQ,
- requesttype, value, REALTEK_USB_VENQT_CMD_IDX,
- io_buf, len, RTW_USB_CONTROL_MSG_TIMEOUT);
+ if (status == -ESHUTDOWN ||
+ status == -ENODEV ||
+ status == -ENOENT) {
+ /*
+ * device or controller has been disabled due to
+ * some problem that could not be worked around,
+ * device or bus doesn’t exist, endpoint does not
+ * exist or is not enabled.
+ */
+ adapt->bSurpriseRemoved = true;
+ goto mutex_unlock;
+ }

- if (status == len) {
- /* success */
- rtw_reset_continual_urb_error(dvobjpriv);
- if (requesttype == REALTEK_USB_VENQT_READ)
- memcpy(data, io_buf, len);
- } else {
- /* errors */
- 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)
- memcpy(data, io_buf, len);
- }
- }
+ if (status < 0) {
+ GET_HAL_DATA(adapt)->srestpriv.wifi_error_status =
+ USB_VEN_REQ_CMD_FAIL;

- if (rtw_inc_and_chk_continual_urb_error(dvobjpriv)) {
- adapt->bSurpriseRemoved = true;
- break;
- }
+ if (rtw_inc_and_chk_continual_urb_error(dvobjpriv))
+ adapt->bSurpriseRemoved = true;

- }
- /* firmware download is checksummed, don't retry */
- if ((value >= FW_8188E_START_ADDRESS && value <= FW_8188E_END_ADDRESS) || status == len)
- break;
+ goto mutex_unlock;
}

+ rtw_reset_continual_urb_error(dvobjpriv);
+ memcpy(data, io_buf, size);
+
+mutex_unlock:
mutex_unlock(&dvobjpriv->usb_vendor_req_mutex);
-exit:
+
return status;
}

-static int usb_read(struct intf_hdl *intfhdl, u16 addr, void *data, u8 size)
+static int usb_write(struct intf_hdl *intfhdl, u16 addr, void *data, u8 size)
{
struct adapter *adapt = intfhdl->padapter;
struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
@@ -103,9 +75,10 @@ static int usb_read(struct intf_hdl *intfhdl, u16 addr, void *data, u8 size)
mutex_lock(&dvobjpriv->usb_vendor_req_mutex);

io_buf = dvobjpriv->usb_vendor_req_buf;
+ memcpy(io_buf, data, size);

- status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
- REALTEK_USB_VENQT_READ, addr,
+ status = usb_control_msg_send(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
+ REALTEK_USB_VENQT_WRITE, addr,
REALTEK_USB_VENQT_CMD_IDX, io_buf,
size, RTW_USB_CONTROL_MSG_TIMEOUT,
GFP_KERNEL);
@@ -134,7 +107,6 @@ static int usb_read(struct intf_hdl *intfhdl, u16 addr, void *data, u8 size)
}

rtw_reset_continual_urb_error(dvobjpriv);
- memcpy(data, io_buf, size);

mutex_unlock:
mutex_unlock(&dvobjpriv->usb_vendor_req_mutex);
@@ -185,7 +157,7 @@ int rtw_write8(struct adapter *adapter, u32 addr, u8 val)
u16 address = addr & 0xffff;
int ret;

- ret = usbctrl_vendorreq(intfhdl, address, &val, 1, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, address, &val, 1);

return RTW_STATUS_CODE(ret);
}
@@ -198,7 +170,7 @@ int rtw_write16(struct adapter *adapter, u32 addr, u16 val)
u16 address = addr & 0xffff;
int ret;

- ret = usbctrl_vendorreq(intfhdl, address, &data, 2, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, address, &data, 2);

return RTW_STATUS_CODE(ret);
}
@@ -211,7 +183,7 @@ int rtw_write32(struct adapter *adapter, u32 addr, u32 val)
u16 address = addr & 0xffff;
int ret;

- ret = usbctrl_vendorreq(intfhdl, address, &data, 4, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, address, &data, 4);

return RTW_STATUS_CODE(ret);
}
@@ -220,7 +192,6 @@ int rtw_writeN(struct adapter *adapter, u32 addr, u32 len, u8 *data)
{
struct io_priv *io_priv = &adapter->iopriv;
struct intf_hdl *intfhdl = &io_priv->intf;
- u8 buf[VENDOR_CMD_MAX_DATA_LEN] = {0};
u16 address = addr & 0xffff;
u16 length = len & 0xffff;
int ret;
@@ -228,8 +199,7 @@ int rtw_writeN(struct adapter *adapter, u32 addr, u32 len, u8 *data)
if (length > VENDOR_CMD_MAX_DATA_LEN)
return _FAIL;

- memcpy(buf, data, length);
- ret = usbctrl_vendorreq(intfhdl, address, buf, length, REALTEK_USB_VENQT_WRITE);
+ ret = usb_write(intfhdl, address, data, length);

return RTW_STATUS_CODE(ret);
}
--
2.33.0
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