rtlwifi: rtl8192cu: Fix endianian issues

Driver rtlwifi fails on a big-endian host.

These changes have been tested on a Mac PowerBook G4, which has
a PPC processor.

Although this patch touches some of the code that will affect endian
issues on PCI hardware through drivers rtl8192ce, rtl8192se, and
rtl8192de, these have not been tested due to lack of suitable hardware.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 26 insertions, 22 deletions

diff --git a/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c b/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c
index ebb73a2fae9..1234e3b32fb 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c
@@ -108,6 +108,7 @@ static void _rtl92c_fw_block_write(struct ieee80211_hw *hw,
 	u8 *bufferPtr = (u8 *) buffer;
 	u32 *pu4BytePtr = (u32 *) buffer;
 	u32 i, offset, blockCount, remainSize;
+	u32 data;
 
 	if (rtlpriv->io.writeN_sync) {
 		rtl_block_fw_writeN(hw, buffer, size);
@@ -115,20 +116,22 @@ static void _rtl92c_fw_block_write(struct ieee80211_hw *hw,
 	}
 	blockCount = size / blockSize;
 	remainSize = size % blockSize;
+	if (remainSize) {
+		/* the last word is < 4 bytes - pad it with zeros */
+		for (i = 0; i < 4 - remainSize; i++)
+			*(bufferPtr + size + i) = 0;
+		blockCount++;
+	}
 
 	for (i = 0; i < blockCount; i++) {
 		offset = i * blockSize;
+		/* for big-endian platforms, the firmware data need to be byte
+		 * swapped as it was read as a byte string and will be written
+		 * as 32-bit dwords and byte swapped when written
+		 */
+		data = le32_to_cpu(*(__le32 *)(pu4BytePtr + i));
 		rtl_write_dword(rtlpriv, (FW_8192C_START_ADDRESS + offset),
-				*(pu4BytePtr + i));
-	}
-
-	if (remainSize) {
-		offset = blockCount * blockSize;
-		bufferPtr += offset;
-		for (i = 0; i < remainSize; i++) {
-			rtl_write_byte(rtlpriv, (FW_8192C_START_ADDRESS +
-						 offset + i), *(bufferPtr + i));
-		}
+				data);
 	}
 }
 
@@ -269,8 +272,9 @@ int rtl92c_download_fw(struct ieee80211_hw *hw)
 	if (IS_FW_HEADER_EXIST(pfwheader)) {
 		RT_TRACE(rtlpriv, COMP_FW, DBG_DMESG,
 			 ("Firmware Version(%d), Signature(%#x),Size(%d)\n",
-			  pfwheader->version, pfwheader->signature,
-			  (uint)sizeof(struct rtl92c_firmware_header)));
+			 le16_to_cpu(pfwheader->version),
+			 le16_to_cpu(pfwheader->signature),
+			 (uint)sizeof(struct rtl92c_firmware_header)));
 
 		pfwdata = pfwdata + sizeof(struct rtl92c_firmware_header);
 		fwsize = fwsize - sizeof(struct rtl92c_firmware_header);
diff --git a/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.h b/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.h
index c55c0541ff1..cec5a3a1cc5 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.h
+++ b/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.h
@@ -38,26 +38,26 @@
 #define FW_8192C_POLLING_TIMEOUT_COUNT		100
 
 #define IS_FW_HEADER_EXIST(_pfwhdr)	\
-	((_pfwhdr->signature&0xFFF0) == 0x92C0 ||\
-	(_pfwhdr->signature&0xFFF0) == 0x88C0)
+	((le16_to_cpu(_pfwhdr->signature)&0xFFF0) == 0x92C0 ||\
+	(le16_to_cpu(_pfwhdr->signature)&0xFFF0) == 0x88C0)
 
 struct rtl92c_firmware_header {
-	u16 signature;
+	__le16 signature;
 	u8 category;
 	u8 function;
-	u16 version;
+	__le16 version;
 	u8 subversion;
 	u8 rsvd1;
 	u8 month;
 	u8 date;
 	u8 hour;
 	u8 minute;
-	u16 ramcodeSize;
-	u16 rsvd2;
-	u32 svnindex;
-	u32 rsvd3;
-	u32 rsvd4;
-	u32 rsvd5;
+	__le16 ramcodeSize;
+	__le16 rsvd2;
+	__le32 svnindex;
+	__le32 rsvd3;
+	__le32 rsvd4;
+	__le32 rsvd5;
 };
 
 enum rtl8192c_h2c_cmd {