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Message-ID: <20240617132309.2588101-16-sashal@kernel.org>
Date: Mon, 17 Jun 2024 09:22:14 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Benjamin Berg <benjamin.berg@...el.com>,
Miri Korenblit <miriam.rachel.korenblit@...el.com>,
Johannes Berg <johannes.berg@...el.com>,
Sasha Levin <sashal@...nel.org>,
kvalo@...nel.org,
gregory.greenman@...el.com,
emmanuel.grumbach@...el.com,
ilan.peer@...el.com,
shaul.triebitz@...el.com,
dan.carpenter@...aro.org,
linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 16/35] wifi: iwlwifi: mvm: remove stale STA link data during restart
From: Benjamin Berg <benjamin.berg@...el.com>
[ Upstream commit cc3ba78f202de9752aceb16342ab62bdfbffac7e ]
If pre-recovery mac80211 tried to disable a link but this disablement
failed, then there might be a mismatch between mac80211 assuming the
link has been disabled and the driver still having the data around.
During recover itself, that is not a problem, but should the link be
activated again at a later point, iwlwifi will refuse the activation as
it detects the inconsistent state.
Solve this corner-case by iterating the station in the restart cleanup
handler.
Signed-off-by: Benjamin Berg <benjamin.berg@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://msgid.link/20240513132416.d2fd60338055.I840d4fdce5fd49fe69896d928b071067e3730259@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
.../net/wireless/intel/iwlwifi/mvm/mac80211.c | 37 +++++++++++++++++++
.../net/wireless/intel/iwlwifi/mvm/mld-sta.c | 10 ++---
drivers/net/wireless/intel/iwlwifi/mvm/sta.h | 5 +++
3 files changed, 47 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 375f401b14535..e281e07be73fc 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -1051,6 +1051,39 @@ static void iwl_mvm_cleanup_iterator(void *data, u8 *mac,
RCU_INIT_POINTER(mvmvif->deflink.probe_resp_data, NULL);
}
+static void iwl_mvm_cleanup_sta_iterator(void *data, struct ieee80211_sta *sta)
+{
+ struct iwl_mvm *mvm = data;
+ struct iwl_mvm_sta *mvm_sta;
+ struct ieee80211_vif *vif;
+ int link_id;
+
+ mvm_sta = iwl_mvm_sta_from_mac80211(sta);
+ vif = mvm_sta->vif;
+
+ if (!sta->valid_links)
+ return;
+
+ for (link_id = 0; link_id < ARRAY_SIZE((sta)->link); link_id++) {
+ struct iwl_mvm_link_sta *mvm_link_sta;
+
+ mvm_link_sta =
+ rcu_dereference_check(mvm_sta->link[link_id],
+ lockdep_is_held(&mvm->mutex));
+ if (mvm_link_sta && !(vif->active_links & BIT(link_id))) {
+ /*
+ * We have a link STA but the link is inactive in
+ * mac80211. This will happen if we failed to
+ * deactivate the link but mac80211 roll back the
+ * deactivation of the link.
+ * Delete the stale data to avoid issues later on.
+ */
+ iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_link_sta,
+ link_id, false);
+ }
+ }
+}
+
static void iwl_mvm_restart_cleanup(struct iwl_mvm *mvm)
{
iwl_mvm_stop_device(mvm);
@@ -1073,6 +1106,10 @@ static void iwl_mvm_restart_cleanup(struct iwl_mvm *mvm)
*/
ieee80211_iterate_interfaces(mvm->hw, 0, iwl_mvm_cleanup_iterator, mvm);
+ /* cleanup stations as links may be gone after restart */
+ ieee80211_iterate_stations_atomic(mvm->hw,
+ iwl_mvm_cleanup_sta_iterator, mvm);
+
mvm->p2p_device_vif = NULL;
iwl_mvm_reset_phy_ctxts(mvm);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
index 121da93e99c6a..2dcc13d4a4a79 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
@@ -515,11 +515,11 @@ static int iwl_mvm_mld_cfg_sta(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
return iwl_mvm_mld_send_sta_cmd(mvm, &cmd);
}
-static void iwl_mvm_mld_free_sta_link(struct iwl_mvm *mvm,
- struct iwl_mvm_sta *mvm_sta,
- struct iwl_mvm_link_sta *mvm_sta_link,
- unsigned int link_id,
- bool is_in_fw)
+void iwl_mvm_mld_free_sta_link(struct iwl_mvm *mvm,
+ struct iwl_mvm_sta *mvm_sta,
+ struct iwl_mvm_link_sta *mvm_sta_link,
+ unsigned int link_id,
+ bool is_in_fw)
{
RCU_INIT_POINTER(mvm->fw_id_to_mac_id[mvm_sta_link->sta_id],
is_in_fw ? ERR_PTR(-EINVAL) : NULL);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index 7364346a1209f..95ef60daa62f0 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -642,6 +642,11 @@ int iwl_mvm_mld_update_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
int iwl_mvm_mld_rm_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
+void iwl_mvm_mld_free_sta_link(struct iwl_mvm *mvm,
+ struct iwl_mvm_sta *mvm_sta,
+ struct iwl_mvm_link_sta *mvm_sta_link,
+ unsigned int link_id,
+ bool is_in_fw);
int iwl_mvm_mld_rm_sta_id(struct iwl_mvm *mvm, u8 sta_id);
int iwl_mvm_mld_update_sta_links(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
--
2.43.0
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