ASoC: SOF: Revert: "core: unregister clients and machine drivers in .shutdown"

The unregister machine drivers call is not safe to do when
kexec is used. Kexec-lite gets blocked with following backtrace:

[   84.943749] Freezing user space processes ... (elapsed 0.111 seconds) done.
[  246.784446] INFO: task kexec-lite:5123 blocked for more than 122 seconds.
[  246.819035] Call Trace:
[  246.821782]  <TASK>
[  246.824186]  __schedule+0x5f9/0x1263
[  246.828231]  schedule+0x87/0xc5
[  246.831779]  snd_card_disconnect_sync+0xb5/0x127
...
[  246.889249]  snd_sof_device_shutdown+0xb4/0x150
[  246.899317]  pci_device_shutdown+0x37/0x61
[  246.903990]  device_shutdown+0x14c/0x1d6
[  246.908391]  kernel_kexec+0x45/0xb9

This reverts commit 83bfc7e793b555291785136c3ae86abcdc046887.

Reported-by: Ricardo Ribalda <ribalda@chromium.org>
Cc: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20221209114529.3909192-3-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 3e6141d..625977a 100644 (file)
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -475,19 +475,10 @@ EXPORT_SYMBOL(snd_sof_device_remove);
 int snd_sof_device_shutdown(struct device *dev)
 {
        struct snd_sof_dev *sdev = dev_get_drvdata(dev);
-       struct snd_sof_pdata *pdata = sdev->pdata;
 
        if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
                cancel_work_sync(&sdev->probe_work);
 
-       /*
-        * make sure clients and machine driver(s) are unregistered to force
-        * all userspace devices to be closed prior to the DSP shutdown sequence
-        */
-       sof_unregister_clients(sdev);
-
-       snd_sof_machine_unregister(sdev, pdata);
-
        if (sdev->fw_state == SOF_FW_BOOT_COMPLETE)
                return snd_sof_shutdown(sdev);