Patch "wifi: iwlwifi: pcie: synchronize IRQs before NAPI" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    wifi: iwlwifi: pcie: synchronize IRQs before NAPI

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-iwlwifi-pcie-synchronize-irqs-before-napi.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f5d2433e4042ea15cb8a3e0e57d8833b1508ef3c
Author: Johannes Berg <johannes.berg@xxxxxxxxx>
Date:   Tue Oct 17 12:16:43 2023 +0300

    wifi: iwlwifi: pcie: synchronize IRQs before NAPI
    
    [ Upstream commit 37fb29bd1f90f16d1abc95c0e9f0ff8eec9829ad ]
    
    When we want to synchronize the NAPI, which was added in
    commit 5af2bb3168db ("wifi: iwlwifi: call napi_synchronize()
    before freeing rx/tx queues"), we also need to make sure we
    can't actually reschedule the NAPI. Yes, this happens while
    interrupts are disabled, but interrupts may still be running
    or pending. Also call iwl_pcie_synchronize_irqs() to ensure
    we won't reschedule the NAPI.
    
    Fixes: 4cf2f5904d97 ("iwlwifi: queue: avoid memory leak in reset flow")
    Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
    Signed-off-by: Gregory Greenman <gregory.greenman@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20231017115047.a0f4104b479a.Id5c50a944f709092aa6256e32d8c63b2b8d8d3ac@changeid
    Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c
index fa46dad5fd680..2ecf6db95fb31 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c
@@ -161,6 +161,7 @@ void _iwl_trans_pcie_gen2_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);
 		iwl_pcie_rx_napi_sync(trans);
 		iwl_txq_gen2_tx_free(trans);
 		iwl_pcie_rx_stop(trans);
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 198933f853c55..583d1011963ec 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -1263,6 +1263,7 @@ 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);
 		iwl_pcie_rx_napi_sync(trans);
 		iwl_pcie_tx_stop(trans);
 		iwl_pcie_rx_stop(trans);



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