On Wed, 7 Apr 2021, Heiner Kallweit wrote:
> Same fix as in 2800aadc18a6 ("iwlwifi: Fix softirq/hardirq disabling in
> iwl_pcie_enqueue_hcmd()") is needed for iwl_pcie_gen2_enqueue_hcmd.
> I get the same lockdep warning on AX210.
Makes sense, it's being called from exactly the same contexts.
From: Jiri Kosina <jkosina@xxxxxxx>
Subject: [PATCH] iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_gen2_enqueue_hcmd()
Analogically to what we did in 2800aadc18a6 ("iwlwifi: Fix
softirq/hardirq disabling in iwl_pcie_enqueue_hcmd()"), we must apply the
same fix to iwl_pcie_gen2_enqueue_hcmd(), as it's being called from
exactly the same contexts.
Reported-by: Heiner Kallweit <hkallweit1@xxxxxxxxx
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
---
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
index 4456abb9a074..34bde8c87324 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
@@ -40,6 +40,7 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
struct iwl_tfh_tfd *tfd;
+ unsigned long flags;
copy_size = sizeof(struct iwl_cmd_header_wide);
cmd_size = sizeof(struct iwl_cmd_header_wide);
@@ -108,14 +109,14 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
goto free_dup_buf;
}
- spin_lock_bh(&txq->lock);
+ spin_lock_irqsave(&txq->lock, flags);
idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
memset(tfd, 0, sizeof(*tfd));
if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
- spin_unlock_bh(&txq->lock);
+ spin_unlock_irqrestore(&txq->lock, flags);
IWL_ERR(trans, "No space in command queue\n");
iwl_op_mode_cmd_queue_full(trans->op_mode);
@@ -250,7 +251,7 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
spin_unlock(&trans_pcie->reg_lock);
out:
- spin_unlock_bh(&txq->lock);
+ spin_unlock_irqrestore(&txq->lock, flags);
free_dup_buf:
if (idx < 0)
kfree(dup_buf);
--
Jiri Kosina
SUSE Labs
