diff mbox series

[07/14] wifi: iwlwifi: mvm: fix cancel_delayed_work_sync() deadlock

Message ID 20230508082433.1349733-8-gregory.greenman@intel.com
State Superseded
Headers show
Series wifi: iwlwifi: updates intended for v6.4 2023-05-08 | expand

Commit Message

Greenman, Gregory May 8, 2023, 8:24 a.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

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>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index e1d02c260e69..01432274a6da 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -2512,7 +2512,7 @@  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);
 			}
 		}