staging: rtl8188eu: remove _rtl88e_fill_dummy

The _rtl88e_fill_dummy function replaced by memset in rtl88eu_download_fw.

More appropriate names are used for pfwdata and fwsize variables
(download_data and download_size respectively).

Also u32 replaced by size_t for download_size variable.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/hal/fw.c

@@ -75,16 +75,6 @@ static void _rtl88e_fw_block_write(struct adapter *adapt,
 		usb_write8(adapt, write_address, byte_buffer[i]);
 }
 
-static void _rtl88e_fill_dummy(u8 *pfwbuf, u32 *pfwlen)
-{
-	u32 i;
-
-	for (i = *pfwlen; i < roundup(*pfwlen, 4); i++)
-		pfwbuf[i] = 0;
-
-	*pfwlen = i;
-}
-
 static void _rtl88e_fw_page_write(struct adapter *adapt,
 				  u32 page, const u8 *buffer, u32 size)
 {
@@ -103,8 +93,6 @@ static void _rtl88e_write_fw(struct adapter *adapt, u8 *buffer, u32 size)
 	u32 page_no, remain;
 	u32 page, offset;
 
-	_rtl88e_fill_dummy(buf_ptr, &size);
-
 	page_no = size / FW_8192C_PAGE_SIZE;
 	remain = size % FW_8192C_PAGE_SIZE;
 
@@ -176,8 +164,9 @@ int rtl88eu_download_fw(struct adapter *adapt)
 	const struct firmware *fw;
 	const char fw_name[] = "rtlwifi/rtl8188eufw.bin";
 	struct rtl92c_firmware_header *pfwheader = NULL;
-	u8 *pfwdata;
-	u32 fwsize;
+	u8 *download_data;
+	size_t download_size;
+	unsigned int trailing_zeros_length;
 
 	if (request_firmware(&fw, fw_name, device)) {
 		dev_err(device, "Firmware %s not available\n", fw_name);
@@ -186,34 +175,40 @@ int rtl88eu_download_fw(struct adapter *adapt)
 
 	if (fw->size > FW_8188E_SIZE) {
 		dev_err(device, "Firmware size exceed 0x%X. Check it.\n",
-			 FW_8188E_SIZE);
+			FW_8188E_SIZE);
 		return -1;
 	}
 
-	pfwdata = kzalloc(FW_8188E_SIZE, GFP_KERNEL);
-	if (!pfwdata)
+	trailing_zeros_length = (4 - fw->size % 4) % 4;
+
+	rtlhal->fwsize = fw->size;
+	rtlhal->pfirmware = kmalloc(fw->size + trailing_zeros_length,
+				    GFP_KERNEL);
+	if (!rtlhal->pfirmware)
 		return -ENOMEM;
 
-	rtlhal->pfirmware = pfwdata;
 	memcpy(rtlhal->pfirmware, fw->data, fw->size);
-	rtlhal->fwsize = fw->size;
-	release_firmware(fw);
+	memset(rtlhal->pfirmware + fw->size, 0, trailing_zeros_length);
 
-	fwsize = rtlhal->fwsize;
-	pfwheader = (struct rtl92c_firmware_header *)pfwdata;
+	pfwheader = (struct rtl92c_firmware_header *)rtlhal->pfirmware;
 
 	if (IS_FW_HEADER_EXIST(pfwheader)) {
-		pfwdata = pfwdata + 32;
-		fwsize = fwsize - 32;
+		download_data = rtlhal->pfirmware + 32;
+		download_size = fw->size + trailing_zeros_length - 32;
+	} else {
+		download_data = rtlhal->pfirmware;
+		download_size = fw->size + trailing_zeros_length;
 	}
 
+	release_firmware(fw);
+
 	if (usb_read8(adapt, REG_MCUFWDL) & RAM_DL_SEL) {
 		usb_write8(adapt, REG_MCUFWDL, 0);
 		rtl88e_firmware_selfreset(adapt);
 	}
 	_rtl88e_enable_fw_download(adapt, true);
 	usb_write8(adapt, REG_MCUFWDL, usb_read8(adapt, REG_MCUFWDL) | FWDL_ChkSum_rpt);
-	_rtl88e_write_fw(adapt, pfwdata, fwsize);
+	_rtl88e_write_fw(adapt, download_data, download_size);
 	_rtl88e_enable_fw_download(adapt, false);
 
 	return _rtl88e_fw_free_to_go(adapt);