Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[linux-2.6-block.git] / drivers / net / wireless / ath / ath5k / eeprom.c

diff --git a/drivers/net/wireless/ath/ath5k/eeprom.c b/drivers/net/wireless/ath/ath5k/eeprom.c
index 5d1c8677f180f2723aa0e986ce6774a353a80477..6a3f4da7fb489a57963c342d31c110a971fed179 100644 (file)
--- 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;
        }