wifi: iwlwifi: mvm: take the mutex before running link selection

[ Upstream commit cd6f46c ]

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: 2e194ef ("wifi: iwlwifi: mvm: Fix race in scan completion")
Signed-off-by: Emmanuel Grumbach <[email protected]>
Reviewed-by: Ilan Peer <[email protected]>
Signed-off-by: Miri Korenblit <[email protected]>
Link: https://patch.msgid.link/20240825191257.0cacecd5db1e.Iaca38a078592b69bdd06549daf63408ccf1810e4@changeid
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: egrumbach

drivers/net/wireless/intel/iwlwifi/mvm/ops.c

@@ -1190,10 +1190,12 @@ 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 *