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| author |   Wey-Yi Guy <wey-yi.w.guy@intel.com> | 2009-11-13 11:56:23 -0800 |
|---|---|---|
| committer |   John W. Linville <linville@tuxdriver.com> | 2009-11-18 17:09:02 -0500 |
| commit | 85f0d9e87794818356146996826b829100daa6bc (patch) | |
| tree | 6420ac21cd980e3685a6adfc2d77a2cd26c92ab0 | |
| parent | Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 (diff) | |
| download | linux-dev-85f0d9e87794818356146996826b829100daa6bc.tar.xz linux-dev-85f0d9e87794818356146996826b829100daa6bc.zip | |
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>
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-eeprom.c | 10 | ||||
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-eeprom.h | 6 |
2 files changed, 14 insertions, 2 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-eeprom.c index 8a0709e81a9f..143728c6382e 100644 --- a/drivers/net/wireless/iwlwifi/iwl-eeprom.c +++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.c @@ -913,6 +913,16 @@ void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv) 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 = diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.h b/drivers/net/wireless/iwlwifi/iwl-eeprom.h index 5ba5a4e9e49a..5cd2b66bbe45 100644 --- a/drivers/net/wireless/iwlwifi/iwl-eeprom.h +++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.h @@ -127,19 +127,21 @@ struct iwl_eeprom_channel { * Enhanced regulatory tx power portion of eeprom image can be broken down * into individual structures; each one is 8 bytes in size and contain the * following information + * @common: (desc + channel) not used by driver, should _NOT_ be "zero" * @chain_a_max_pwr: chain a max power in 1/2 dBm * @chain_b_max_pwr: chain b max power in 1/2 dBm * @chain_c_max_pwr: chain c max power in 1/2 dBm + * @reserved: not used, should be "zero" * @mimo2_max_pwr: mimo2 max power in 1/2 dBm * @mimo3_max_pwr: mimo3 max power in 1/2 dBm * */ struct iwl_eeprom_enhanced_txpwr { - u16 reserved; + u16 common; s8 chain_a_max; s8 chain_b_max; s8 chain_c_max; - s8 reserved1; + s8 reserved; s8 mimo2_max; s8 mimo3_max; } __attribute__ ((packed)); |