From ecc7c518b3017821a6b26fb5fdaa548afa8ee236 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Mon, 17 Aug 2015 15:54:41 +0300 Subject: [PATCH] iwlwifi: mvm: fix a race in D0i3 vs. Tx path When we enter D0i3, we must stop TXing otherwise the sequence number we use might conflict with the firmware's internal TX. In order to do so, we have IWL_MVM_STATUS_IN_D0I3 which should prevent any Tx while we enter D0i3. There is a bug in this code since we may Tx even if IWL_MVM_STATUS_IN_D0I3 is set. This can happen as long as mvm->d0i3_ap_sta_id is not set. To make sure that we don't have any packet in the Tx path while we set mvm->d0i3_ap_sta_id, call synchronize_net only after we already set mvm->d0i3_ap_sta_id. Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/ops.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/ops.c b/drivers/net/wireless/iwlwifi/mvm/ops.c index 02ce184..07e6892 100644 --- a/drivers/net/wireless/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/iwlwifi/mvm/ops.c @@ -1114,9 +1114,7 @@ int iwl_mvm_enter_d0i3(struct iwl_op_mode *op_mode) IWL_DEBUG_RPM(mvm, "MVM entering D0i3\n"); - /* make sure we have no running tx while configuring the qos */ set_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status); - synchronize_net(); /* * iwl_mvm_ref_sync takes a reference before checking the flag. @@ -1144,6 +1142,9 @@ int iwl_mvm_enter_d0i3(struct iwl_op_mode *op_mode) mvm->d0i3_offloading = false; } + /* make sure we have no running tx while configuring the seqno */ + synchronize_net(); + iwl_mvm_set_wowlan_data(mvm, &wowlan_config_cmd, &d0i3_iter_data); ret = iwl_mvm_send_cmd_pdu(mvm, WOWLAN_CONFIGURATION, flags, sizeof(wowlan_config_cmd), -- 2.7.4