iwlwifi: validate enhanced tx power entry
Validate enhanced tx power entry read from EEPROM before applying the
tx power value. Different versions of EEPROM might contain different size
of table; always a good idea to make sure the entry is valid before
applying to the targeted channel.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
index 8a0709e..143728c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom.c
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
@@ -913,6 +913,16 @@
enhanced_txpower = (struct iwl_eeprom_enhanced_txpwr *)
iwl_eeprom_query_addr(priv, offset);
+ /*
+ * check for valid entry -
+ * different version of EEPROM might contain different set
+ * of enhanced tx power table
+ * always check for valid entry before process
+ * the information
+ */
+ if (!enhanced_txpower->common || enhanced_txpower->reserved)
+ continue;
+
for (element = 0; element < eeprom_section_count; element++) {
if (enhinfo[section].is_common)
max_txpower_avg =