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Problem in iwl_pcie_gen2_enqueue_hcmd if irqs are disabled

Message ID 0af0ac51-1e13-8406-221e-db2c31b3695e@gmail.com (mailing list archive)
State New
Delegated to: Gregory Greenman
Headers show
Series Problem in iwl_pcie_gen2_enqueue_hcmd if irqs are disabled | expand

Commit Message

Heiner Kallweit March 19, 2021, 10:43 a.m. UTC
I get the following error on linux-next when bringing the device up.
It's such an obvious error that I wonder how it could pass your QA.

led_trigger_event() disables interrupts, and spin_unlock_bh() complains
about this. The following fixes the warning for me.

I'd say this means also commit "iwlwifi: pcie: don't disable interrupts
for reg_lock" is wrong.
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diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
index 4456abb9a..34bde8c87 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");
@@ -250,7 +251,7 @@  int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
-	spin_unlock_bh(&txq->lock);
+	spin_unlock_irqrestore(&txq->lock, flags);
 	if (idx < 0)