iwlwifi: mvm: don't send GEO_TX_POWER_LIMIT to old firmwares

Old firmware versions don't support this command. Sending it
to any firmware before -41.ucode will crash the firmware.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=201975

Fixes: 66e839030fd6 ("iwlwifi: fix wrong WGDS_WIFI_DATA_SIZE")
CC: <stable@vger.kernel.org> #4.19+
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 2ba8904..1689bea 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -881,6 +881,15 @@ static int iwl_mvm_sar_geo_init(struct iwl_mvm *mvm)
        int ret, i, j;
        u16 cmd_wide_id =  WIDE_ID(PHY_OPS_GROUP, GEO_TX_POWER_LIMIT);
 
+       /*
+        * This command is not supported on earlier firmware versions.
+        * Unfortunately, we don't have a TLV API flag to rely on, so
+        * rely on the major version which is in the first byte of
+        * ucode_ver.
+        */
+       if (IWL_UCODE_SERIAL(mvm->fw->ucode_ver) < 41)
+               return 0;
+
        ret = iwl_mvm_sar_get_wgds_table(mvm);
        if (ret < 0) {
                IWL_DEBUG_RADIO(mvm,