ath5k: Fix eeprom checksum check for custom sized eeproms

Commit 8bf3d79bc401ca417ccf9fc076d3295d1a71dbf5 enabled EEPROM
checksum checks to avoid bogus bug reports but failed to address
updating the code to consider devices with custom EEPROM sizes.
Devices with custom sized EEPROMs have the upper limit size stuffed
in the EEPROM. Use this as the upper limit instead of the static
default size. In case of a checksum error also provide back the
max size and whether or not this was the default size or a custom
one. If the EEPROM is busted we add a failsafe check to ensure
we don't loop forever or try to read bogus areas of hardware.

This closes bug 14874

http://bugzilla.kernel.org/show_bug.cgi?id=14874

Cc: stable@kernel.org
Cc: David Quan <david.quan@atheros.com>
Cc: Stephen Beahm <stephenbeahm@comcast.net>
Reported-by: Joshua Covington <joshuacov@googlemail.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 37 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/ath5k/eeprom.c b/drivers/net/wireless/ath/ath5k/eeprom.c
index 791885262602..9a96550006ad 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;
         }
 
diff --git a/drivers/net/wireless/ath/ath5k/eeprom.h b/drivers/net/wireless/ath/ath5k/eeprom.h
index 0123f3521a0b..473a483bb9c3 100644
--- a/drivers/net/wireless/ath/ath5k/eeprom.h
+++ b/drivers/net/wireless/ath/ath5k/eeprom.h
@@ -37,6 +37,14 @@
 #define AR5K_EEPROM_RFKILL_POLARITY_S   1
 
 #define AR5K_EEPROM_REG_DOMAIN          0x00bf  /* EEPROM regdom */
+
+/* FLASH(EEPROM) Defines for AR531X chips */
+#define AR5K_EEPROM_SIZE_LOWER          0x1b /* size info -- lower */
+#define AR5K_EEPROM_SIZE_UPPER          0x1c /* size info -- upper */
+#define AR5K_EEPROM_SIZE_UPPER_MASK     0xfff0
+#define AR5K_EEPROM_SIZE_UPPER_SHIFT    4
+#define AR5K_EEPROM_SIZE_ENDLOC_SHIFT   12
+
 #define AR5K_EEPROM_CHECKSUM            0x00c0  /* EEPROM checksum */
 #define AR5K_EEPROM_INFO_BASE           0x00c0  /* EEPROM header */
 #define AR5K_EEPROM_INFO_MAX            (0x400 - AR5K_EEPROM_INFO_BASE)