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@atomide.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230508082014.23083-2-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 3f33014..79bdf93 100644 (file)
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1453,7 +1453,9 @@ 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;
 }