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From: Bard Liao <yung-chuan.liao@linux.intel.com>
To: linux-sound@vger.kernel.org,
	vkoul@kernel.org
Cc: vinod.koul@linaro.org,
	linux-kernel@vger.kernel.org,
	pierre-louis.bossart@linux.intel.com,
	bard.liao@intel.com
Subject: [PATCH] soundwire: fix usages of device_get_named_child_node()
Date: Mon, 29 Apr 2024 00:49:35 +0000
Message-Id: <20240429004935.2400191-1-yung-chuan.liao@linux.intel.com>
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MIME-Version: 1.0
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From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

The documentation for device_get_named_child_node() mentions this
important point:

"
The caller is responsible for calling fwnode_handle_put() on the
returned fwnode pointer.
"

Add fwnode_handle_put() to avoid leaked references.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
---
 drivers/soundwire/amd_manager.c     |  3 +++
 drivers/soundwire/intel_auxdevice.c |  6 +++++-
 drivers/soundwire/mipi_disco.c      | 30 +++++++++++++++++++++++------
 3 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index 1066d87aa011..14bc624bc6b5 100644
--- a/drivers/soundwire/amd_manager.c
+++ b/drivers/soundwire/amd_manager.c
@@ -558,6 +558,9 @@ static int sdw_master_read_amd_prop(struct sdw_bus *bus)
 	amd_manager->wake_en_mask = wake_en_mask;
 	fwnode_property_read_u32(link, "amd-sdw-power-mode", &power_mode_mask);
 	amd_manager->power_mode_mask = power_mode_mask;
+
+	fwnode_handle_put(link);
+
 	return 0;
 }
 
diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c
index 17cf27e6ea73..18517121cc89 100644
--- a/drivers/soundwire/intel_auxdevice.c
+++ b/drivers/soundwire/intel_auxdevice.c
@@ -155,8 +155,10 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus)
 		SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
 
 	intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL);
-	if (!intel_prop)
+	if (!intel_prop) {
+		fwnode_handle_put(link);
 		return -ENOMEM;
+	}
 
 	/* initialize with hardware defaults, in case the properties are not found */
 	intel_prop->doaise = 0x1;
@@ -184,6 +186,8 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus)
 		intel_prop->dodse,
 		intel_prop->dods);
 
+	fwnode_handle_put(link);
+
 	return 0;
 }
 
diff --git a/drivers/soundwire/mipi_disco.c b/drivers/soundwire/mipi_disco.c
index 55a9c51c84c1..e5d9df26d4dc 100644
--- a/drivers/soundwire/mipi_disco.c
+++ b/drivers/soundwire/mipi_disco.c
@@ -66,8 +66,10 @@ int sdw_master_read_prop(struct sdw_bus *bus)
 		prop->clk_freq = devm_kcalloc(bus->dev, prop->num_clk_freq,
 					      sizeof(*prop->clk_freq),
 					      GFP_KERNEL);
-		if (!prop->clk_freq)
+		if (!prop->clk_freq) {
+			fwnode_handle_put(link);
 			return -ENOMEM;
+		}
 
 		fwnode_property_read_u32_array(link,
 				"mipi-sdw-clock-frequencies-supported",
@@ -92,8 +94,10 @@ int sdw_master_read_prop(struct sdw_bus *bus)
 		prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
 					       sizeof(*prop->clk_gears),
 					       GFP_KERNEL);
-		if (!prop->clk_gears)
+		if (!prop->clk_gears) {
+			fwnode_handle_put(link);
 			return -ENOMEM;
+		}
 
 		fwnode_property_read_u32_array(link,
 					       "mipi-sdw-supported-clock-gears",
@@ -116,6 +120,8 @@ int sdw_master_read_prop(struct sdw_bus *bus)
 	fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
 				 &prop->err_threshold);
 
+	fwnode_handle_put(link);
+
 	return 0;
 }
 EXPORT_SYMBOL(sdw_master_read_prop);
@@ -197,8 +203,10 @@ static int sdw_slave_read_dpn(struct sdw_slave *slave,
 						    dpn[i].num_words,
 						    sizeof(*dpn[i].words),
 						    GFP_KERNEL);
-			if (!dpn[i].words)
+			if (!dpn[i].words) {
+				fwnode_handle_put(node);
 				return -ENOMEM;
+			}
 
 			fwnode_property_read_u32_array(node,
 					"mipi-sdw-port-wordlength-configs",
@@ -236,8 +244,10 @@ static int sdw_slave_read_dpn(struct sdw_slave *slave,
 						       dpn[i].num_channels,
 						       sizeof(*dpn[i].channels),
 						 GFP_KERNEL);
-			if (!dpn[i].channels)
+			if (!dpn[i].channels) {
+				fwnode_handle_put(node);
 				return -ENOMEM;
+			}
 
 			fwnode_property_read_u32_array(node,
 					"mipi-sdw-channel-number-list",
@@ -251,8 +261,10 @@ static int sdw_slave_read_dpn(struct sdw_slave *slave,
 					dpn[i].num_ch_combinations,
 					sizeof(*dpn[i].ch_combinations),
 					GFP_KERNEL);
-			if (!dpn[i].ch_combinations)
+			if (!dpn[i].ch_combinations) {
+				fwnode_handle_put(node);
 				return -ENOMEM;
+			}
 
 			fwnode_property_read_u32_array(node,
 					"mipi-sdw-channel-combination-list",
@@ -274,6 +286,8 @@ static int sdw_slave_read_dpn(struct sdw_slave *slave,
 
 		/* TODO: Read audio mode */
 
+		fwnode_handle_put(node);
+
 		i++;
 	}
 
@@ -348,10 +362,14 @@ int sdw_slave_read_prop(struct sdw_slave *slave)
 		prop->dp0_prop = devm_kzalloc(&slave->dev,
 					      sizeof(*prop->dp0_prop),
 					      GFP_KERNEL);
-		if (!prop->dp0_prop)
+		if (!prop->dp0_prop) {
+			fwnode_handle_put(port);
 			return -ENOMEM;
+		}
 
 		sdw_slave_read_dp0(slave, port, prop->dp0_prop);
+
+		fwnode_handle_put(port);
 	}
 
 	/*
-- 
2.34.1