Patch "ASoC: SOF: core: Free the firmware trace before calling snd_sof_shutdown()" has been added to the 6.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    ASoC: SOF: core: Free the firmware trace before calling snd_sof_shutdown()

to the 6.4-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:
     asoc-sof-core-free-the-firmware-trace-before-calling.patch
and it can be found in the queue-6.4 subdirectory.

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



commit 891652fb3423e11ea2cdcdc944268f3084fdcb3a
Author: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Date:   Fri Jun 16 12:00:34 2023 +0200

    ASoC: SOF: core: Free the firmware trace before calling snd_sof_shutdown()
    
    [ Upstream commit d389dcb3a48cec4f03c16434c0bf98a4c635372a ]
    
    The shutdown is called on reboot/shutdown of the machine.
    At this point the firmware tracing cannot be used anymore but in case of
    IPC3 it is using and keeping a DMA channel active (dtrace).
    
    For Tiger Lake platforms we have a quirk in place to fix rare reboot issues
    when a DMA was active before rebooting the system.
    If the tracing is enabled this quirk will be always used and a print
    appears on the kernel log which might be misleading or not even correct.
    
    Release the fw tracing before executing the shutdown to make sure that this
    known DMA user is cleared away.
    
    Reviewed-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
    Reviewed-by: Daniel Baluta <daniel.baluta@xxxxxxx>
    Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
    Reviewed-by: Rander Wang <rander.wang@xxxxxxxxx>
    Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
    Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
    Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230616100039.378150-4-pierre-louis.bossart@xxxxxxxxxxxxxxx
    Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 9a9d82220fd0d..30db685cc5f4b 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -504,8 +504,10 @@ int snd_sof_device_shutdown(struct device *dev)
 	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
 		cancel_work_sync(&sdev->probe_work);
 
-	if (sdev->fw_state == SOF_FW_BOOT_COMPLETE)
+	if (sdev->fw_state == SOF_FW_BOOT_COMPLETE) {
+		sof_fw_trace_free(sdev);
 		return snd_sof_shutdown(sdev);
+	}
 
 	return 0;
 }