linux-kernel - [PATCH v2 03/36] coresight: tpiu: Cleanup power management

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Message-Id: <1555344260-12375-4-git-send-email-suzuki.poulose@arm.com>
Date:   Mon, 15 Apr 2019 17:03:46 +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 03/36] coresight: tpiu: Cleanup power management

Drop the power only when we have successfully probed. Otherwise
leave it to the amba probe to do the rest.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-tpiu.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index b2f72a1..4977467 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -153,7 +153,6 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	/* Disable tpiu to support older devices */
 	tpiu_disable_hw(drvdata);
 
-	pm_runtime_put(&adev->dev);
 
 	desc.type = CORESIGHT_DEV_TYPE_SINK;
 	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
@@ -162,7 +161,12 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.dev = dev;
 	drvdata->csdev = coresight_register(&desc);
 
-	return PTR_ERR_OR_ZERO(drvdata->csdev);
+	if (!IS_ERR(drvdata->csdev)) {
+		pm_runtime_put(&adev->dev);
+		return 0;
+	}
+
+	return PTR_ERR(drvdata->csdev);
 }
 
 #ifdef CONFIG_PM
-- 
2.7.4