wifi: iwlwifi: mvm: fix cancel_delayed_work_sync() deadlock

[ Upstream commit c2d8b7f257b2398f2d866205365895e038beca12 ]

Lockdep points out that we can deadlock here by calling
cancel_delayed_work_sync() because that might be already
running and gotten interrupted by the NAPI soft-IRQ.
Even just calling something that can sleep is wrong in
this context though.

Luckily, it doesn't even really matter since the things
we need to do are idempotent, so just drop the _sync().

Fixes: e5d153ec54f0 ("iwlwifi: mvm: fix CSA AP side")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230514120631.b1813c823b4d.I9d20cc06d24fa40b6774d3dd95ea5e2bf8dd015b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index e685113172c526f650e567e8127177171ad31991..ad410b6efce733fc2aa08245e37ff2f6f61cd5ba 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -1967,7 +1967,7 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
                                RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
                                /* Unblock BCAST / MCAST station */
                                iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false);
-                               cancel_delayed_work_sync(&mvm->cs_tx_unblock_dwork);
+                               cancel_delayed_work(&mvm->cs_tx_unblock_dwork);
                        }
                }