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ASoC: SOF: loader: release_firmware() on failures to avoid batching #2954

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merged 1 commit into from
Jul 7, 2021
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ASoC: SOF: loader: release_firmware() on failures to avoid batching #2954

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4 changes: 1 addition & 3 deletions sound/soc/sof/core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -371,7 +371,6 @@ int snd_sof_device_remove(struct device *dev)
dev_warn(dev, "error: %d failed to prepare DSP for device removal",
ret);

snd_sof_fw_unload(sdev);
snd_sof_ipc_free(sdev);
snd_sof_free_debug(sdev);
snd_sof_free_trace(sdev);
Expand All @@ -394,8 +393,7 @@ int snd_sof_device_remove(struct device *dev)
snd_sof_remove(sdev);

/* release firmware */
release_firmware(pdata->fw);
pdata->fw = NULL;
snd_sof_fw_unload(sdev);

return 0;
}
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2 changes: 2 additions & 0 deletions sound/soc/sof/loader.c
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Expand Up @@ -855,5 +855,7 @@ EXPORT_SYMBOL(snd_sof_run_firmware);
void snd_sof_fw_unload(struct snd_sof_dev *sdev)
{
/* TODO: support module unloading at runtime */
release_firmware(sdev->pdata->fw);
sdev->pdata->fw = NULL;
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@ranj063 ranj063 Jul 2, 2021 •
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in terms of what it achieves today , this is fine. But when and if we do start supporting module unload at runtime, won't this need to be moved before snd_sof_remove()?

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@marc-hb marc-hb Jul 2, 2021 •
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@ranj063 I don't understand your comment sorry. Do you mean release_firmware() should be invoked before snd_sof_remove() in the future? I don't see why. As @ujfalusi wrote, the only reason we need the struct firmware again is to resume after suspend (especially on platforms without IMR resume), even for that it shouldn't be needed eventually. So releasing struct firmware before or after some releasing other things does not matter, does it? Of course the sooner the better but I don't see any required order or dependency.

I asked the compiler to list all places where we use struct firmware, here is the complete list as of commit 132b2ee

- loader.c
snd_sof_load_firmware_raw()
snd_sof_load_firmware_memcpy()
snd_sof_device_remove() or snd_sof_fw_unload() # this PR
- hda-loader.c
hda_dsp_cl_boot_firmware()
hda_dsp_cl_boot_firmware_iccmax()

It's not used anywhere else with my current .config.

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I'm not sure why the order of release_firmware() would matter, in snd_sof_device_remove() the firmware is not needed, we could have drop it first thing or last thing. It does not really matter.

@ranj063, what does "module unload at runtime" means? Do you want to be able to remove the modules while audio is playing or something else?
Are we preparing for hot-plugable DSPs?

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from what I understood, I think runtime module unload means you load/unload FW modules based on topology. But I could be wrong. And in any cae, we're a bit far from supporting this at the moment. So this PR is good to go for now.

}
EXPORT_SYMBOL(snd_sof_fw_unload);