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wifi: iwlwifi: mvm: fix cancel_delayed_work_sync() deadlock

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[ Upstream commit c2d8b7f257 ]

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: e5d153ec54 ("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>
This commit is contained in:
Johannes Berg
2023-05-14 12:15:46 +03:00
committed by Greg Kroah-Hartman
parent fce7d92a89
commit d66490c293
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
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@@ -1907,7 +1907,7 @@ 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);
}
}