linux-kernel - [PATCH v2 4/4] coresight: etm3x: Release CLAIM tag when operated from perf

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Message-Id: <1541632132-1252-5-git-send-email-mathieu.poirier@linaro.org>
Date:   Wed,  7 Nov 2018 16:08:52 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     alexander.shishkin@...ux.intel.com, leo.yan@...aro.org,
        suzuki.poulose@....com, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] coresight: etm3x: Release CLAIM tag when operated from perf

This patch deals with the release of the CLAIM tag when the ETM is
operated from perf.  Otherwise the tag is left asserted and subsequent
requests to use the device fail.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/hwtracing/coresight/coresight-etm3x.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 4f638d81a66a..d7f452e62193 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -602,6 +602,7 @@ static void etm_disable_perf(struct coresight_device *csdev)
 	 * power down the tracer.
 	 */
 	etm_set_pwrdwn(drvdata);
+	coresight_disclaim_device_unlocked(drvdata->base);
 
 	CS_LOCK(drvdata->base);
 }
-- 
2.7.4