linux-kernel - [PATCH 1/6] ASoC: cs35l56: Remove quick-cancelling of dsp

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Date:   Tue, 11 Apr 2023 16:25:23 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH 1/6] 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@...nsource.cirrus.com>
---
 sound/soc/codecs/cs35l56.c | 8 +-------
 sound/soc/codecs/cs35l56.h | 1 -
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
index d97b465f0d3c..675aad8e909f 100644
--- a/sound/soc/codecs/cs35l56.c
+++ b/sound/soc/codecs/cs35l56.c
@@ -867,7 +867,7 @@ 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",
@@ -917,9 +917,6 @@ 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);
@@ -967,7 +964,6 @@ 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);
 
@@ -984,8 +980,6 @@ 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);
 }
 
diff --git a/sound/soc/codecs/cs35l56.h b/sound/soc/codecs/cs35l56.h
index efc4b99180f9..dc91cd7d877f 100644
--- a/sound/soc/codecs/cs35l56.h
+++ b/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;
-- 
2.30.2