linux-kernel - [PATCH] ALSA: hda: cs35l56: Fix lifetime of cs

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Date: Wed, 8 May 2024 11:08:11 +0100
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: <tiwai@...e.com>
CC: <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        <alsa-devel@...a-project.org>, <linux-sound@...r.kernel.org>
Subject: [PATCH] ALSA: hda: cs35l56: Fix lifetime of cs_dsp instance

The cs_dsp instance is initialized in the driver probe() so it
should be freed in the driver remove(). Also fix a missing call
to cs_dsp_remove() in the error path of cs35l56_hda_common_probe().

The call to cs_dsp_remove() was being done in the component unbind
callback cs35l56_hda_unbind(). This meant that if the driver was
unbound and then re-bound it would be using an uninitialized cs_dsp
instance.

It is best to initialize the cs_dsp instance in probe() so that it
can return an error if it fails. The component binding API doesn't
have any error handling so there's no way to handle a failure if
cs_dsp was initialized in the bind.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 73cfbfa9caea ("ALSA: hda/cs35l56: Add driver for Cirrus Logic CS35L56 amplifier")
---
 sound/pci/hda/cs35l56_hda.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/sound/pci/hda/cs35l56_hda.c b/sound/pci/hda/cs35l56_hda.c
index 558c1f38fe97..11b0570ff56d 100644
--- a/sound/pci/hda/cs35l56_hda.c
+++ b/sound/pci/hda/cs35l56_hda.c
@@ -732,8 +732,6 @@ static void cs35l56_hda_unbind(struct device *dev, struct device *master, void *
 	if (cs35l56->base.fw_patched)
 		cs_dsp_power_down(&cs35l56->cs_dsp);
 
-	cs_dsp_remove(&cs35l56->cs_dsp);
-
 	if (comps[cs35l56->index].dev == dev)
 		memset(&comps[cs35l56->index], 0, sizeof(*comps));
 
@@ -1035,7 +1033,7 @@ int cs35l56_hda_common_probe(struct cs35l56_hda *cs35l56, int hid, int id)
 			       ARRAY_SIZE(cs35l56_hda_dai_config));
 	ret = cs35l56_force_sync_asp1_registers_from_cache(&cs35l56->base);
 	if (ret)
-		goto err;
+		goto dsp_err;
 
 	/*
 	 * By default only enable one ASP1TXn, where n=amplifier index,
@@ -1061,6 +1059,8 @@ int cs35l56_hda_common_probe(struct cs35l56_hda *cs35l56, int hid, int id)
 
 pm_err:
 	pm_runtime_disable(cs35l56->base.dev);
+dsp_err:
+	cs_dsp_remove(&cs35l56->cs_dsp);
 err:
 	gpiod_set_value_cansleep(cs35l56->base.reset_gpio, 0);
 
@@ -1078,6 +1078,8 @@ void cs35l56_hda_remove(struct device *dev)
 
 	component_del(cs35l56->base.dev, &cs35l56_hda_comp_ops);
 
+	cs_dsp_remove(&cs35l56->cs_dsp);
+
 	kfree(cs35l56->system_name);
 	pm_runtime_put_noidle(cs35l56->base.dev);
 
-- 
2.39.2