From: Sara Sharon Date: Mon, 27 Aug 2018 11:07:20 +0000 (+0300) Subject: iwlwifi: pcie: lock txq a bit later in reclaim code X-Git-Tag: v5.0-rc1~129^2~19^2~10 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=3681729429f4626c85a4eb62e5ce76be0b626f87;p=linux.git iwlwifi: pcie: lock txq a bit later in reclaim code In reclaim code, we don't need to take the queue lock for waking the queue. The code section is executed only when the tx path is stopped, and since the reclaim path is not executed in parallel to itself, no one can update the queue pointers, and accessing them is safe without a lock. Signed-off-by: Sara Sharon Signed-off-by: Luca Coelho Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c index 3d53842ee60e..ee990a7a5411 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c @@ -1160,10 +1160,11 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn, */ iwl_trans_tx(trans, skb, dev_cmd_ptr, txq_id); } - spin_lock_bh(&txq->lock); if (iwl_queue_space(trans, txq) > txq->low_mark) iwl_wake_queue(trans, txq); + + spin_lock_bh(&txq->lock); } if (txq->read_ptr == txq->write_ptr) {