[PATCH 5.15 05/59] wifi: iwlwifi: pcie: dont synchronize IRQs from IRQ

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 400f6ebbc175286576c7f7fddf3c347d09d12310 ]

On older devices (before unified image!) we can end up calling
stop_device from an rfkill interrupt. However, in stop_device
we attempt to synchronize IRQs, which then of course deadlocks.

Avoid this by checking the context, if running from the IRQ
thread then don't synchronize. This wouldn't be correct on a
new device since RSS is supported, but older devices only have
a single interrupt/queue.

Fixes: 37fb29bd1f90 ("wifi: iwlwifi: pcie: synchronize IRQs before NAPI")
Reviewed-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20231215111335.59aab00baed7.Iadfe154d6248e7f9dfd69522e5429dbbd72925d7@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../net/wireless/intel/iwlwifi/pcie/internal.h  |  4 ++--
 drivers/net/wireless/intel/iwlwifi/pcie/rx.c    |  8 ++++----
 drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 17 +++++++++--------
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
index 74959de9d7002..04c801748b338 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
@@ -728,7 +728,7 @@ static inline void iwl_enable_rfkill_int(struct iwl_trans *trans)
 	}
 }
 
-void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans);
+void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans, bool from_irq);
 
 static inline bool iwl_is_rfkill_set(struct iwl_trans *trans)
 {
@@ -775,7 +775,7 @@ static inline bool iwl_pcie_dbg_on(struct iwl_trans *trans)
 	return (trans->dbg.dest_tlv || iwl_trans_dbg_ini_valid(trans));
 }
 
-void iwl_trans_pcie_rf_kill(struct iwl_trans *trans, bool state);
+void iwl_trans_pcie_rf_kill(struct iwl_trans *trans, bool state, bool from_irq);
 void iwl_trans_pcie_dump_regs(struct iwl_trans *trans);
 
 #ifdef CONFIG_IWLWIFI_DEBUGFS
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
index df201d40f6c95..29be7ed768947 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -1780,7 +1780,7 @@ static u32 iwl_pcie_int_cause_ict(struct iwl_trans *trans)
 	return inta;
 }
 
-void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans)
+void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans, bool from_irq)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 	struct isr_statistics *isr_stats = &trans_pcie->isr_stats;
@@ -1804,7 +1804,7 @@ void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans)
 	isr_stats->rfkill++;
 
 	if (prev != report)
-		iwl_trans_pcie_rf_kill(trans, report);
+		iwl_trans_pcie_rf_kill(trans, report, from_irq);
 	mutex_unlock(&trans_pcie->mutex);
 
 	if (hw_rfkill) {
@@ -1944,7 +1944,7 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
 
 	/* HW RF KILL switch toggled */
 	if (inta & CSR_INT_BIT_RF_KILL) {
-		iwl_pcie_handle_rfkill_irq(trans);
+		iwl_pcie_handle_rfkill_irq(trans, true);
 		handled |= CSR_INT_BIT_RF_KILL;
 	}
 
@@ -2332,7 +2332,7 @@ irqreturn_t iwl_pcie_irq_msix_handler(int irq, void *dev_id)
 
 	/* HW RF KILL switch toggled */
 	if (inta_hw & MSIX_HW_INT_CAUSES_REG_RF_KILL)
-		iwl_pcie_handle_rfkill_irq(trans);
+		iwl_pcie_handle_rfkill_irq(trans, true);
 
 	if (inta_hw & MSIX_HW_INT_CAUSES_REG_HW_ERR) {
 		IWL_ERR(trans,
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 8a19463bc81c1..8170d06974837 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -1046,7 +1046,7 @@ bool iwl_pcie_check_hw_rf_kill(struct iwl_trans *trans)
 	report = test_bit(STATUS_RFKILL_OPMODE, &trans->status);
 
 	if (prev != report)
-		iwl_trans_pcie_rf_kill(trans, report);
+		iwl_trans_pcie_rf_kill(trans, report, false);
 
 	return hw_rfkill;
 }
@@ -1170,7 +1170,7 @@ static void iwl_pcie_init_msix(struct iwl_trans_pcie *trans_pcie)
 	trans_pcie->hw_mask = trans_pcie->hw_init_mask;
 }
 
-static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans)
+static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans, bool from_irq)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 
@@ -1197,7 +1197,8 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans)
 	if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
 		IWL_DEBUG_INFO(trans,
 			       "DEVICE_ENABLED bit was set and is now cleared\n");
-		iwl_pcie_synchronize_irqs(trans);
+		if (!from_irq)
+			iwl_pcie_synchronize_irqs(trans);
 		iwl_pcie_rx_napi_sync(trans);
 		iwl_pcie_tx_stop(trans);
 		iwl_pcie_rx_stop(trans);
@@ -1385,7 +1386,7 @@ void iwl_trans_pcie_handle_stop_rfkill(struct iwl_trans *trans,
 		clear_bit(STATUS_RFKILL_OPMODE, &trans->status);
 	}
 	if (hw_rfkill != was_in_rfkill)
-		iwl_trans_pcie_rf_kill(trans, hw_rfkill);
+		iwl_trans_pcie_rf_kill(trans, hw_rfkill, false);
 }
 
 static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
@@ -1400,12 +1401,12 @@ static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
 	mutex_lock(&trans_pcie->mutex);
 	trans_pcie->opmode_down = true;
 	was_in_rfkill = test_bit(STATUS_RFKILL_OPMODE, &trans->status);
-	_iwl_trans_pcie_stop_device(trans);
+	_iwl_trans_pcie_stop_device(trans, false);
 	iwl_trans_pcie_handle_stop_rfkill(trans, was_in_rfkill);
 	mutex_unlock(&trans_pcie->mutex);
 }
 
-void iwl_trans_pcie_rf_kill(struct iwl_trans *trans, bool state)
+void iwl_trans_pcie_rf_kill(struct iwl_trans *trans, bool state, bool from_irq)
 {
 	struct iwl_trans_pcie __maybe_unused *trans_pcie =
 		IWL_TRANS_GET_PCIE_TRANS(trans);
@@ -1418,7 +1419,7 @@ void iwl_trans_pcie_rf_kill(struct iwl_trans *trans, bool state)
 		if (trans->trans_cfg->gen2)
 			_iwl_trans_pcie_gen2_stop_device(trans);
 		else
-			_iwl_trans_pcie_stop_device(trans);
+			_iwl_trans_pcie_stop_device(trans, from_irq);
 	}
 }
 
@@ -2741,7 +2742,7 @@ static ssize_t iwl_dbgfs_rfkill_write(struct file *file,
 	IWL_WARN(trans, "changing debug rfkill %d->%d\n",
 		 trans_pcie->debug_rfkill, new_value);
 	trans_pcie->debug_rfkill = new_value;
-	iwl_pcie_handle_rfkill_irq(trans);
+	iwl_pcie_handle_rfkill_irq(trans, false);
 
 	return count;
 }
-- 
2.43.0