ASoC: cs35l56: Remove quick-cancelling of dsp_work()

Delete the 'removing' flag and don't kick init_completion to make a
quick cancel of dsp_work(). Just let it timeout on the wait for the
completion.

Simplify the code to standard cancelling or flushing of the work.
This avoids introducing corner cases from a layer of custom signalling.
It also avoids potential race conditions when system-suspend handling
is added.

Unless the hardware is broken, the dsp_work() will already have started
and passed the completion before the driver would want to cancel it.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/168122674746.26.16881587647873355224@mailman-core.alsa-project.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs35l56.c

@@ -875,7 +875,7 @@ static void cs35l56_dsp_work(struct work_struct *work)
 		goto complete;
 	}
 
-	if (!cs35l56->init_done || cs35l56->removing)
+	if (!cs35l56->init_done)
 		goto complete;
 
 	cs35l56->dsp.part = devm_kasprintf(cs35l56->dev, GFP_KERNEL, "cs35l56%s-%02x",
@@ -925,9 +925,6 @@ static void cs35l56_dsp_work(struct work_struct *work)
 		goto err;
 	}
 
-	if (cs35l56->removing)
-		goto err;
-
 	mutex_lock(&cs35l56->irq_lock);
 
 	init_completion(&cs35l56->init_completion);
@@ -975,7 +972,6 @@ static int cs35l56_component_probe(struct snd_soc_component *component)
 
 	BUILD_BUG_ON(ARRAY_SIZE(cs35l56_tx_input_texts) != ARRAY_SIZE(cs35l56_tx_input_values));
 
-	cs35l56->removing = false;
 	cs35l56->component = component;
 	wm_adsp2_component_probe(&cs35l56->dsp, component);
 
@@ -992,8 +988,6 @@ static void cs35l56_component_remove(struct snd_soc_component *component)
 {
 	struct cs35l56_private *cs35l56 = snd_soc_component_get_drvdata(component);
 
-	cs35l56->removing = true;
-	complete(&cs35l56->init_completion);
 	cancel_work_sync(&cs35l56->dsp_work);
 }
 

sound/soc/codecs/cs35l56.h

@@ -49,7 +49,6 @@ struct cs35l56_private {
 	bool soft_resetting;
 	bool init_done;
 	bool sdw_attached;
-	bool removing;
 	bool fw_patched;
 	bool can_hibernate;
 	struct completion init_completion;