From eca1e56ceedd9cc185eb18baf307d3ff2e4af376 Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Fri, 14 Dec 2018 18:30:22 +0200
Subject: [PATCH] iwlwifi: mvm: don't send GEO_TX_POWER_LIMIT to old firmwares
Git-commit: eca1e56ceedd9cc185eb18baf307d3ff2e4af376
Patch-mainline: v4.20
References: bsc#1119086
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>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 2ba890445c35..1689bead1b4f 100644
--- 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,
--
2.16.4