linux-kernel - [PATCH v2 26/36] coresight: Add support for releasing platform specific data

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Date:   Mon, 15 Apr 2019 17:04:09 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
        mathieu.poirier@...aro.org, mike.leach@...aro.org,
        rjw@...ysocki.net, robert.walker@....com,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 26/36] coresight: Add support for releasing platform specific data

Add a helper to clean up the platform specific data provided
by the firmware. This will be later used for dropping the necessary
references when we switch to the fwnode handles for tracking
connections.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-platform.c | 12 +++++++++---
 drivers/hwtracing/coresight/coresight-priv.h     |  4 ++++
 drivers/hwtracing/coresight/coresight.c          |  3 +++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 0415fff..a408b01 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -17,6 +17,7 @@
 #include <linux/cpumask.h>
 #include <asm/smp_plat.h>
 
+#include "coresight-priv.h"
 /*
  * coresight_alloc_conns: Allocate connections record for each output
  * port from the device.
@@ -304,7 +305,7 @@ EXPORT_SYMBOL_GPL(coresight_get_cpu);
 struct coresight_platform_data *
 coresight_get_platform_data(struct device *dev)
 {
-	struct coresight_platform_data *pdata;
+	struct coresight_platform_data *pdata, *ret = NULL;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
 
 	if (IS_ERR_OR_NULL(fwnode))
@@ -315,8 +316,13 @@ coresight_get_platform_data(struct device *dev)
 		return ERR_PTR(-ENOMEM);
 
 	if (is_of_node(fwnode))
-		return of_get_coresight_platform_data(dev, pdata);
+		ret = of_get_coresight_platform_data(dev, pdata);
 
-	return ERR_PTR(-ENOENT);
+	if (!IS_ERR_OR_NULL(ret))
+		return pdata;
+
+	/* Cleanup the connection information */
+	coresight_release_platform_data(pdata);
+	return 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 e0684d0..c216421 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -200,4 +200,8 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 	return 0;
 }
 
+static inline void
+coresight_release_platform_data(struct coresight_platform_data *pdata)
+{}
+
 #endif
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index f6c5244..82fb411 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1248,6 +1248,8 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 err_free_csdev:
 	kfree(csdev);
 err_out:
+	/* Cleanup the connection information */
+	coresight_release_platform_data(desc->pdata);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(coresight_register);
@@ -1257,6 +1259,7 @@ void coresight_unregister(struct coresight_device *csdev)
 	etm_perf_del_symlink_sink(csdev);
 	/* Remove references of that device in the topology */
 	coresight_remove_conns(csdev);
+	coresight_release_platform_data(csdev->pdata);
 	device_unregister(&csdev->dev);
 }
 EXPORT_SYMBOL_GPL(coresight_unregister);
-- 
2.7.4