Patch "serial: 8250: omap: Fix freeing of resources on failed register" has been added to the 6.4-stable tree

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

    serial: 8250: omap: Fix freeing of resources on failed register

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:
     serial-8250-omap-fix-freeing-of-resources-on-failed-.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 7ebf7ae08debb85c532c05127810a86646721ca3
Author: Tony Lindgren <tony@xxxxxxxxxxx>
Date:   Mon May 8 11:20:11 2023 +0300

    serial: 8250: omap: Fix freeing of resources on failed register
    
    [ Upstream commit b9ab22c2bc8652324a803b3e2be69838920b4025 ]
    
    If serial8250_register_8250_port() fails, the SoC can hang as the
    deferred PMQoS work will still run as is not flushed and removed.
    
    Fixes: 61929cf0169d ("tty: serial: Add 8250-core based omap driver")
    Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
    Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230508082014.23083-2-tony@xxxxxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 734f092ef839a..05dc568bd3898 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1532,7 +1532,9 @@ static int omap8250_probe(struct platform_device *pdev)
 err:
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_put_sync(&pdev->dev);
+	flush_work(&priv->qos_work);
 	pm_runtime_disable(&pdev->dev);
+	cpu_latency_qos_remove_request(&priv->pm_qos_request);
 	return ret;
 }
 



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