1 files changed, 41 insertions, 16 deletions

diff --git a/drivers/net/wireless/ath/ath9k/eeprom.c b/drivers/net/wireless/ath/ath9k/eeprom.c
index a449588a8009..0e46797601be 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/eeprom.c
@@ -155,11 +155,19 @@ bool ath9k_hw_nvram_read(struct ath_hw *ah, u32 off, u16 *data)
 	return ret;
 }
 
+#ifdef __BIG_ENDIAN
+#define EXPECTED_EEPMISC_ENDIAN AR5416_EEPMISC_BIG_ENDIAN
+#else
+#define EXPECTED_EEPMISC_ENDIAN 0
+#endif
+
 int ath9k_hw_nvram_swap_data(struct ath_hw *ah, bool *swap_needed, int size)
 {
 	u16 magic;
 	u16 *eepdata;
+	u8 eepmisc;
 	int i;
+	bool needs_byteswap = false;
 	struct ath_common *common = ath9k_hw_common(ah);
 
 	if (!ath9k_hw_nvram_read(ah, AR5416_EEPROM_MAGIC_OFFSET, &magic)) {
@@ -167,36 +175,53 @@ int ath9k_hw_nvram_swap_data(struct ath_hw *ah, bool *swap_needed, int size)
 		return -EIO;
 	}
 
-	*swap_needed = false;
 	if (swab16(magic) == AR5416_EEPROM_MAGIC) {
+		needs_byteswap = true;
+		ath_dbg(common, EEPROM,
+			"EEPROM needs byte-swapping to correct endianness.\n");
+	} else if (magic != AR5416_EEPROM_MAGIC) {
+		if (ath9k_hw_use_flash(ah)) {
+			ath_dbg(common, EEPROM,
+				"Ignoring invalid EEPROM magic (0x%04x).\n",
+				magic);
+		} else {
+			ath_err(common,
+				"Invalid EEPROM magic (0x%04x).\n", magic);
+			return -EINVAL;
+		}
+	}
+
+	if (needs_byteswap) {
 		if (ah->ah_flags & AH_NO_EEP_SWAP) {
 			ath_info(common,
 				 "Ignoring endianness difference in EEPROM magic bytes.\n");
 		} else {
-			*swap_needed = true;
-		}
-	} else if (magic != AR5416_EEPROM_MAGIC) {
-		if (ath9k_hw_use_flash(ah))
-			return 0;
+			eepdata = (u16 *)(&ah->eeprom);
 
-		ath_err(common,
-			"Invalid EEPROM Magic (0x%04x).\n", magic);
-		return -EINVAL;
+			for (i = 0; i < size; i++)
+				eepdata[i] = swab16(eepdata[i]);
+		}
 	}
 
-	eepdata = (u16 *)(&ah->eeprom);
-
-	if (*swap_needed) {
-		ath_dbg(common, EEPROM,
-			"EEPROM Endianness is not native.. Changing.\n");
+	*swap_needed = false;
 
-		for (i = 0; i < size; i++)
-			eepdata[i] = swab16(eepdata[i]);
+	eepmisc = ah->eep_ops->get_eepmisc(ah);
+	if ((eepmisc & AR5416_EEPMISC_BIG_ENDIAN) != EXPECTED_EEPMISC_ENDIAN) {
+		if (ah->ah_flags & AH_NO_EEP_SWAP) {
+			ath_info(common,
+				 "Ignoring endianness difference in eepmisc register.\n");
+		} else {
+			*swap_needed = true;
+			ath_dbg(common, EEPROM,
+				"EEPROM needs swapping according to the eepmisc register.\n");
+		}
 	}
 
 	return 0;
 }
 
+#undef EXPECTED_EEPMISC_VAL
+
 bool ath9k_hw_nvram_validate_checksum(struct ath_hw *ah, int size)
 {
 	u32 i, sum = 0;