linux-kernel - [PATCH v2 1/1] ASoC: amd: acp-es8336: Drop reference count of ACPI device after use

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Message-Id: <20230112112356.67643-1-andriy.shevchenko@linux.intel.com>
Date:   Thu, 12 Jan 2023 13:23:56 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 1/1] ASoC: amd: acp-es8336: 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: 02527c3f2300 ("ASoC: amd: add Machine driver for Jadeite platform")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
v2: split from big series (Pierre), added tag (Vijendar)
 sound/soc/amd/acp-es8336.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/soc/amd/acp-es8336.c b/sound/soc/amd/acp-es8336.c
index 2fe8df86053a..89499542c803 100644
--- a/sound/soc/amd/acp-es8336.c
+++ b/sound/soc/amd/acp-es8336.c
@@ -198,9 +198,11 @@ static int st_es8336_late_probe(struct snd_soc_card *card)
 	int ret;
 
 	adev = acpi_dev_get_first_match_dev("ESSX8336", NULL, -1);
-	if (adev)
-		put_device(&adev->dev);
+	if (!adev)
+		return -ENODEV;
+
 	codec_dev = acpi_get_first_physical_node(adev);
+	acpi_dev_put(adev);
 	if (!codec_dev)
 		dev_err(card->dev, "can not find codec dev\n");
 
-- 
2.39.0