linux-kernel - [PATCH 2/2] coresight: trbe: Allocate platform data per device

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Date:   Wed, 16 Aug 2023 15:10:08 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     hejunhao3@...wei.com
Cc:     coresight@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jonathan.cameron@...wei.com,
        leo.yan@...aro.org, mike.leach@...aro.org, james.clark@....com,
        linuxarm@...wei.com, yangyicong@...wei.com,
        prime.zeng@...ilicon.com,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: [PATCH 2/2] coresight: trbe: Allocate platform data per device

Coresight TRBE driver shares a single platform data (which is empty btw).
However, with the commit 4e8fe7e5c3a5
("coresight: Store pointers to connections rather than an array of them")
the coresight core would free up the pdata, resulting in multiple attempts
to free the same pdata for TRBE instances. Fix this by allocating a pdata per
coresight_device.

Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver")
Link: https://lore.kernel.org/r/20230814093813.19152-3-hejunhao3@huawei.com
Reported-by: Junhao He <hejunhao3@...wei.com>
Cc: Anshuman Khandual <anshuman.khandual@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 025f70adee47..d3d34a833f01 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -1255,10 +1255,13 @@ static void arm_trbe_register_coresight_cpu(struct trbe_drvdata *drvdata, int cp
 	if (!desc.name)
 		goto cpu_clear;
 
+	desc.pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(desc.pdata))
+		goto cpu_clear;
+
 	desc.type = CORESIGHT_DEV_TYPE_SINK;
 	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PERCPU_SYSMEM;
 	desc.ops = &arm_trbe_cs_ops;
-	desc.pdata = dev_get_platdata(dev);
 	desc.groups = arm_trbe_groups;
 	desc.dev = dev;
 	trbe_csdev = coresight_register(&desc);
@@ -1482,7 +1485,6 @@ static void arm_trbe_remove_irq(struct trbe_drvdata *drvdata)
 
 static int arm_trbe_device_probe(struct platform_device *pdev)
 {
-	struct coresight_platform_data *pdata;
 	struct trbe_drvdata *drvdata;
 	struct device *dev = &pdev->dev;
 	int ret;
@@ -1497,12 +1499,7 @@ static int arm_trbe_device_probe(struct platform_device *pdev)
 	if (!drvdata)
 		return -ENOMEM;
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-
 	dev_set_drvdata(dev, drvdata);
-	dev->platform_data = pdata;
 	drvdata->pdev = pdev;
 	ret = arm_trbe_probe_irq(pdev, drvdata);
 	if (ret)
-- 
2.34.1