staging: r8188eu: remove the helpers of usb_read_port()

Remove the unnecessary _rtw_read_port() and usb_read_port() and embed their
code into the caller (i.e., rtw_read_port()).

_rtw_read_port() is a mere redefinition of rtw_read_port() and it is
unneeded. usb_read_port() was the only functions assigned to the
(*_usb_read_port) pointer, so we can simply remove it and make a direct
call.

This patch is in preparation for the _io_ops structure removal.
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Co-developed-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210917071837.10926-10-fmdefrancesco@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_io.c

@@ -75,24 +75,6 @@ int _rtw_write32_async(struct adapter *adapter, u32 addr, u32 val)
 	return RTW_STATUS_CODE(ret);
 }
 
-void _rtw_read_port(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem)
-{
-	u32 (*_read_port)(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *pmem);
-	struct io_priv *pio_priv = &adapter->iopriv;
-	struct	intf_hdl		*pintfhdl = &pio_priv->intf;
-
-
-
-	if (adapter->bDriverStopped || adapter->bSurpriseRemoved)
-	     return;
-
-	_read_port = pintfhdl->io_ops._read_port;
-
-	_read_port(pintfhdl, addr, cnt, pmem);
-
-
-}
-
 void _rtw_read_port_cancel(struct adapter *adapter)
 {
 	void (*_read_port_cancel)(struct intf_hdl *pintfhdl);

drivers/staging/r8188eu/hal/usb_halinit.c

@@ -1033,11 +1033,7 @@ static unsigned int rtl8188eu_inirp_init(struct adapter *Adapter)
 	u8 i;
 	struct recv_buf *precvbuf;
 	uint	status;
-	struct intf_hdl *pintfhdl = &Adapter->iopriv.intf;
 	struct recv_priv *precvpriv = &Adapter->recvpriv;
-	u32 (*_read_port)(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *pmem);
-
-	_read_port = pintfhdl->io_ops._read_port;
 
 	status = _SUCCESS;
 
@@ -1046,7 +1042,7 @@ static unsigned int rtl8188eu_inirp_init(struct adapter *Adapter)
 	/* issue Rx irp to receive data */
 	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 	for (i = 0; i < NR_RECVBUFF; i++) {
-		if (!_read_port(pintfhdl, precvpriv->ff_hwaddr, 0, (unsigned char *)precvbuf)) {
+		if (!rtw_read_port(Adapter, precvpriv->ff_hwaddr, 0, (unsigned char *)precvbuf)) {
 			status = _FAIL;
 			goto exit;
 		}

drivers/staging/r8188eu/hal/usb_ops_linux.c

@@ -456,11 +456,10 @@ static void usb_read_port_complete(struct urb *purb, struct pt_regs *regs)
 	}
 }
 
-static u32 usb_read_port(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *rmem)
+u32 rtw_read_port(struct adapter *adapter, u32 addr, u32 cnt, u8 *rmem)
 {
 	struct urb *purb = NULL;
 	struct recv_buf	*precvbuf = (struct recv_buf *)rmem;
-	struct adapter		*adapter = pintfhdl->padapter;
 	struct dvobj_priv	*pdvobj = adapter_to_dvobj(adapter);
 	struct recv_priv	*precvpriv = &adapter->recvpriv;
 	struct usb_device	*pusbd = pdvobj->pusbdev;
@@ -563,7 +562,6 @@ void rtl8188eu_set_intf_ops(struct _io_ops	*pops)
 {
 
 	memset((u8 *)pops, 0, sizeof(struct _io_ops));
-	pops->_read_port = &usb_read_port;
 	pops->_write_port = &usb_write_port;
 	pops->_read_port_cancel = &usb_read_port_cancel;
 	pops->_write_port_cancel = &usb_write_port_cancel;

drivers/staging/r8188eu/include/rtw_io.h

@@ -249,7 +249,7 @@ u8 rtw_read8(struct adapter *adapter, u32 addr);
 u16 rtw_read16(struct adapter *adapter, u32 addr);
 u32 rtw_read32(struct adapter *adapter, u32 addr);
 void _rtw_read_mem(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem);
-void _rtw_read_port(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem);
+u32 rtw_read_port(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem);
 void _rtw_read_port_cancel(struct adapter *adapter);
 
 int rtw_write8(struct adapter *adapter, u32 addr, u8 val);
@@ -267,8 +267,6 @@ u32 _rtw_write_port_and_wait(struct adapter *adapter, u32 addr, u32 cnt,
 			     u8 *pmem, int timeout_ms);
 void _rtw_write_port_cancel(struct adapter *adapter);
 
-#define rtw_read_port(adapter, addr, cnt, mem)				\
-	_rtw_read_port((adapter), (addr), (cnt), (mem))
 #define rtw_read_port_cancel(adapter) _rtw_read_port_cancel((adapter))
 
 #define rtw_write8_async(adapter, addr, val)				\