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[07/13] wifi: iwlwifi: mvm: take the mutex before running link selection

Message ID 20240825191257.0cacecd5db1e.Iaca38a078592b69bdd06549daf63408ccf1810e4@changeid (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show
Series wifi: iwlwifi: fixes - 25-08-2024 | expand

Commit Message

Korenblit, Miriam Rachel Aug. 25, 2024, 4:17 p.m. UTC 
From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

iwl_mvm_select_links is called by the link selection worker and it
requires the mutex.
Take it in the link selection worker.
This logic used to run from iwl_mvm_rx_umac_scan_complete_notif which
had the mvm->mutex held. This was changed to run in a worker holding the
wiphy mutex, but we also need the mvm->mutex.

Fixes: 2e194efa3809 ("wifi: iwlwifi: mvm: Fix race in scan completion")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 1cc5667340e8..d809742528af 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -1198,10 +1198,12 @@  static void iwl_mvm_trig_link_selection(struct wiphy *wiphy,
 	struct iwl_mvm *mvm =
 		container_of(wk, struct iwl_mvm, trig_link_selection_wk);
 
+	mutex_lock(&mvm->mutex);
 	ieee80211_iterate_active_interfaces(mvm->hw,
 					    IEEE80211_IFACE_ITER_NORMAL,
 					    iwl_mvm_find_link_selection_vif,
 					    NULL);
+	mutex_unlock(&mvm->mutex);
 }
 
 static struct iwl_op_mode *