[PATCH v1 15/17] ASoC: intel: boards: Switch to use acpi_bus_get_primary_device()

["Rafael J. Wysocki" <rafael@kernel.org>]

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

Replace acpi_get_first_physical_node() that is slated for removal
with acpi_bus_get_primary_device() that takes a reference to the
device it is about to return.

This addresses a potential use-after-free that may occur if the
device returned by acpi_get_first_physical_node() is removed right
after dropping its ACPI companion's physical_node_lock in that
function.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 sound/soc/intel/boards/bytcht_es8316.c     | 4 ++--
 sound/soc/intel/boards/bytcr_rt5640.c      | 4 ++--
 sound/soc/intel/boards/bytcr_rt5651.c      | 4 ++--
 sound/soc/intel/boards/cht_bsw_rt5645.c    | 5 ++---
 sound/soc/intel/boards/sof_cirrus_common.c | 2 +-
 sound/soc/intel/boards/sof_es8336.c        | 4 ++--
 6 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/sound/soc/intel/boards/bytcht_es8316.c b/sound/soc/intel/boards/bytcht_es8316.c
index ea387dc74273..4d8d1d176a49 100644
--- a/sound/soc/intel/boards/bytcht_es8316.c
+++ b/sound/soc/intel/boards/bytcht_es8316.c
@@ -601,11 +601,11 @@ static int snd_byt_cht_es8316_mc_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	codec_dev = acpi_get_first_physical_node(adev);
+	codec_dev = acpi_bus_get_primary_device(adev);
 	acpi_dev_put(adev);
 	if (!codec_dev)
 		return -EPROBE_DEFER;
-	priv->codec_dev = get_device(codec_dev);
+	priv->codec_dev = codec_dev;
 
 	/* override platform name, if required */
 	byt_cht_es8316_card.dev = dev;
diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c
index 40da3eea5fa7..c84b9a0fe65a 100644
--- a/sound/soc/intel/boards/bytcr_rt5640.c
+++ b/sound/soc/intel/boards/bytcr_rt5640.c
@@ -1744,11 +1744,11 @@ static int snd_byt_rt5640_mc_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	codec_dev = acpi_get_first_physical_node(adev);
+	codec_dev = acpi_bus_get_primary_device(adev);
 	acpi_dev_put(adev);
 
 	if (codec_dev) {
-		priv->codec_dev = get_device(codec_dev);
+		priv->codec_dev = codec_dev;
 	} else {
 		/*
 		 * Special case for Android tablets where the codec i2c_client
diff --git a/sound/soc/intel/boards/bytcr_rt5651.c b/sound/soc/intel/boards/bytcr_rt5651.c
index 62cb4856c797..a0ed56d285bc 100644
--- a/sound/soc/intel/boards/bytcr_rt5651.c
+++ b/sound/soc/intel/boards/bytcr_rt5651.c
@@ -943,11 +943,11 @@ static int snd_byt_rt5651_mc_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	codec_dev = acpi_get_first_physical_node(adev);
+	codec_dev = acpi_bus_get_primary_device(adev);
 	acpi_dev_put(adev);
 	if (!codec_dev)
 		return -EPROBE_DEFER;
-	priv->codec_dev = get_device(codec_dev);
+	priv->codec_dev = codec_dev;
 
 	/*
 	 * swap SSP0 if bytcr is detected
diff --git a/sound/soc/intel/boards/cht_bsw_rt5645.c b/sound/soc/intel/boards/cht_bsw_rt5645.c
index 249be121be15..4f20928a3604 100644
--- a/sound/soc/intel/boards/cht_bsw_rt5645.c
+++ b/sound/soc/intel/boards/cht_bsw_rt5645.c
@@ -529,7 +529,6 @@ static int snd_cht_mc_probe(struct platform_device *pdev)
 	const char *platform_name;
 	struct cht_mc_private *drv;
 	struct acpi_device *adev;
-	struct device *codec_dev;
 	bool sof_parent;
 	bool found = false;
 	bool is_bytcr = false;
@@ -583,8 +582,8 @@ static int snd_cht_mc_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	/* acpi_get_first_physical_node() returns a borrowed ref, no need to deref */
-	codec_dev = acpi_get_first_physical_node(adev);
+	struct device *codec_dev __free(put_device) = acpi_bus_get_primary_device(adev);
+
 	acpi_dev_put(adev);
 	if (!codec_dev)
 		return -EPROBE_DEFER;
diff --git a/sound/soc/intel/boards/sof_cirrus_common.c b/sound/soc/intel/boards/sof_cirrus_common.c
index 88fc6cb2bfd4..a4ecb1f9a615 100644
--- a/sound/soc/intel/boards/sof_cirrus_common.c
+++ b/sound/soc/intel/boards/sof_cirrus_common.c
@@ -168,7 +168,7 @@ static int cs35l41_compute_codec_conf(void)
 				 cs35l41_name_prefixes[uid]);
 			continue;
 		}
-		physdev = get_device(acpi_get_first_physical_node(adev));
+		physdev = acpi_bus_get_primary_device(adev);
 		acpi_dev_put(adev);
 		if (!physdev) {
 			pr_devel("Cannot find physical node for HID %s UID %u (%s)\n", CS35L41_HID,
diff --git a/sound/soc/intel/boards/sof_es8336.c b/sound/soc/intel/boards/sof_es8336.c
index 9b016136c639..3c0d7155f059 100644
--- a/sound/soc/intel/boards/sof_es8336.c
+++ b/sound/soc/intel/boards/sof_es8336.c
@@ -693,11 +693,11 @@ static int sof_es8336_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	codec_dev = acpi_get_first_physical_node(adev);
+	codec_dev = acpi_bus_get_primary_device(adev);
 	acpi_dev_put(adev);
 	if (!codec_dev)
 		return -EPROBE_DEFER;
-	priv->codec_dev = get_device(codec_dev);
+	priv->codec_dev = codec_dev;
 
 	ret = snd_soc_fixup_dai_links_platform_name(&sof_es8336_card,
 						    mach->mach_params.platform);
-- 
2.51.0