linux-kernel - [PATCH v4 5/8] coresight: Refactor sysfs connection group cleanup

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Message-Id: <20260209-arm_coresight_refactor_dev_register-v4-5-62d6042f76f7@arm.com>
Date: Mon, 09 Feb 2026 12:44:37 +0000
From: Leo Yan <leo.yan@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@....com>, James Clark <james.clark@...aro.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Mathieu Poirier <mathieu.poirier@...aro.org>, 
 Mao Jinlong <quic_jinlmao@...cinc.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Leo Yan <leo.yan@....com>
Subject: [PATCH v4 5/8] coresight: Refactor sysfs connection group cleanup

Move the sysfs connection group cleanup into coresight_remove_conns(),
so that the driver removes connections and related sysfs resources in
one go.

As side effect, the csdev argument to coresight_release_platform_data()
is no longer needed; adjust the code for this.

Reviewed-by: James Clark <james.clark@...aro.org>
Signed-off-by: Leo Yan <leo.yan@....com>
---
 drivers/hwtracing/coresight/coresight-core.c     | 11 +++++------
 drivers/hwtracing/coresight/coresight-platform.c |  2 +-
 drivers/hwtracing/coresight/coresight-priv.h     |  3 +--
 3 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 4b2cc1806c4f9cdd8a22dbce930973aef41f00c6..b3119832725c08a8375a3a55a11b3bda14b8a3e0 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1200,6 +1200,8 @@ static void coresight_remove_conns(struct coresight_device *csdev)
 		coresight_remove_links(conn->src_dev, conn);
 		conn->dest_dev = NULL;
 	}
+
+	coresight_remove_conns_sysfs_group(csdev);
 }
 
 /**
@@ -1300,8 +1302,7 @@ void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
  * coresight_release_platform_data: Release references to the devices connected
  * to the output port of this device.
  */
-void coresight_release_platform_data(struct coresight_device *csdev,
-				     struct device *dev,
+void coresight_release_platform_data(struct device *dev,
 				     struct coresight_platform_data *pdata)
 {
 	int i;
@@ -1319,8 +1320,6 @@ void coresight_release_platform_data(struct coresight_device *csdev,
 	devm_kfree(dev, pdata->out_conns);
 	devm_kfree(dev, pdata->in_conns);
 	devm_kfree(dev, pdata);
-	if (csdev)
-		coresight_remove_conns_sysfs_group(csdev);
 }
 
 struct coresight_device *coresight_register(struct coresight_desc *desc)
@@ -1423,7 +1422,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 	}
 
 err_out:
-	coresight_release_platform_data(NULL, desc->dev, desc->pdata);
+	coresight_release_platform_data(desc->dev, desc->pdata);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(coresight_register);
@@ -1438,7 +1437,7 @@ void coresight_unregister(struct coresight_device *csdev)
 	etm_perf_del_symlink_sink(csdev);
 	coresight_remove_conns(csdev);
 	coresight_clear_default_sink(csdev);
-	coresight_release_platform_data(csdev, csdev->dev.parent, csdev->pdata);
+	coresight_release_platform_data(csdev->dev.parent, csdev->pdata);
 	device_unregister(&csdev->dev);
 	mutex_unlock(&coresight_mutex);
 }
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 0db64c5f499592e1985141161b4f90fa1f0410b4..0ca3bd762454350d33b5630244d0cfe638ee03fb 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -849,7 +849,7 @@ coresight_get_platform_data(struct device *dev)
 error:
 	if (!IS_ERR_OR_NULL(pdata))
 		/* Cleanup the connection information */
-		coresight_release_platform_data(NULL, dev, pdata);
+		coresight_release_platform_data(dev, pdata);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(coresight_get_platform_data);
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index fd896ac07942ec0a4c7acff9f32421352c1efef2..1ea882dffd703b2873e41b4ce0c2564d2ce9bbad 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -239,8 +239,7 @@ static inline void *coresight_get_uci_data_from_amba(const struct amba_id *table
 	return NULL;
 }
 
-void coresight_release_platform_data(struct coresight_device *csdev,
-				     struct device *dev,
+void coresight_release_platform_data(struct device *dev,
 				     struct coresight_platform_data *pdata);
 struct coresight_device *
 coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode);

-- 
2.34.1