Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6

1 files changed, 29 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/ath5k/eeprom.c b/drivers/net/wireless/ath/ath5k/eeprom.c
index 5d1c8677f180..6a3f4da7fb48 100644
--- a/drivers/net/wireless/ath/ath5k/eeprom.c
+++ b/drivers/net/wireless/ath/ath5k/eeprom.c
@@ -97,7 +97,7 @@ ath5k_eeprom_init_header(struct ath5k_hw *ah)
 	struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
 	int ret;
 	u16 val;
-	u32 cksum, offset;
+	u32 cksum, offset, eep_max = AR5K_EEPROM_INFO_MAX;
 
 	/*
 	 * Read values from EEPROM and store them in the capability structure
@@ -116,12 +116,38 @@ ath5k_eeprom_init_header(struct ath5k_hw *ah)
 	 * Validate the checksum of the EEPROM date. There are some
 	 * devices with invalid EEPROMs.
 	 */
-	for (cksum = 0, offset = 0; offset < AR5K_EEPROM_INFO_MAX; offset++) {
+	AR5K_EEPROM_READ(AR5K_EEPROM_SIZE_UPPER, val);
+	if (val) {
+		eep_max = (val & AR5K_EEPROM_SIZE_UPPER_MASK) <<
+			   AR5K_EEPROM_SIZE_ENDLOC_SHIFT;
+		AR5K_EEPROM_READ(AR5K_EEPROM_SIZE_LOWER, val);
+		eep_max = (eep_max | val) - AR5K_EEPROM_INFO_BASE;
+
+		/*
+		 * Fail safe check to prevent stupid loops due
+		 * to busted EEPROMs. XXX: This value is likely too
+		 * big still, waiting on a better value.
+		 */
+		if (eep_max > (3 * AR5K_EEPROM_INFO_MAX)) {
+			ATH5K_ERR(ah->ah_sc, "Invalid max custom EEPROM size: "
+				  "%d (0x%04x) max expected: %d (0x%04x)\n",
+				  eep_max, eep_max,
+				  3 * AR5K_EEPROM_INFO_MAX,
+				  3 * AR5K_EEPROM_INFO_MAX);
+			return -EIO;
+		}
+	}
+
+	for (cksum = 0, offset = 0; offset < eep_max; offset++) {
 		AR5K_EEPROM_READ(AR5K_EEPROM_INFO(offset), val);
 		cksum ^= val;
 	}
 	if (cksum != AR5K_EEPROM_INFO_CKSUM) {
-		ATH5K_ERR(ah->ah_sc, "Invalid EEPROM checksum 0x%04x\n", cksum);
+		ATH5K_ERR(ah->ah_sc, "Invalid EEPROM "
+			  "checksum: 0x%04x eep_max: 0x%04x (%s)\n",
+			  cksum, eep_max,
+			  eep_max == AR5K_EEPROM_INFO_MAX ?
+				"default size" : "custom size");
 		return -EIO;
 	}