linux-kernel - [PATCH v2 3/5] ASoC: Intel: bytcr_rt5640: Drop reference count of ACPI device after use

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Message-Id: <20230112112852.67714-4-andriy.shevchenko@linux.intel.com>
Date:   Thu, 12 Jan 2023 13:28:50 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Cezary Rojewski <cezary.rojewski@...el.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 3/5] ASoC: Intel: bytcr_rt5640: Drop reference count of ACPI device after use

Theoretically the device might gone if its reference count drops to 0.
This might be the case when we try to find the first physical node of
the ACPI device. We need to keep reference to it until we get a result
of the above mentioned call. Refactor the code to drop the reference
count at the correct place.

While at it, move to acpi_dev_put() as symmetrical call to the
acpi_dev_get_first_match_dev().

Fixes: a232b96dcece ("ASoC: Intel: bytcr_rt5640: use HID translation util")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 sound/soc/intel/boards/bytcr_rt5640.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c
index 4699ca79f3ea..79e0039c79a3 100644
--- a/sound/soc/intel/boards/bytcr_rt5640.c
+++ b/sound/soc/intel/boards/bytcr_rt5640.c
@@ -1636,13 +1636,18 @@ static int snd_byt_rt5640_mc_probe(struct platform_device *pdev)
 	if (adev) {
 		snprintf(byt_rt5640_codec_name, sizeof(byt_rt5640_codec_name),
 			 "i2c-%s", acpi_dev_name(adev));
-		put_device(&adev->dev);
 		byt_rt5640_dais[dai_index].codecs->name = byt_rt5640_codec_name;
 	} else {
 		dev_err(dev, "Error cannot find '%s' dev\n", mach->id);
 		return -ENXIO;
 	}
 
+	codec_dev = acpi_get_first_physical_node(adev);
+	acpi_dev_put(adev);
+	if (!codec_dev)
+		return -EPROBE_DEFER;
+	priv->codec_dev = get_device(codec_dev);
+
 	/*
 	 * swap SSP0 if bytcr is detected
 	 * (will be overridden if DMI quirk is detected)
@@ -1717,11 +1722,6 @@ static int snd_byt_rt5640_mc_probe(struct platform_device *pdev)
 		byt_rt5640_quirk = quirk_override;
 	}
 
-	codec_dev = acpi_get_first_physical_node(adev);
-	if (!codec_dev)
-		return -EPROBE_DEFER;
-	priv->codec_dev = get_device(codec_dev);
-
 	if (byt_rt5640_quirk & BYT_RT5640_JD_HP_ELITEP_1000G2) {
 		acpi_dev_add_driver_gpios(ACPI_COMPANION(priv->codec_dev),
 					  byt_rt5640_hp_elitepad_1000g2_gpios);
-- 
2.39.0