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@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 6f30d52da9e4da7062908568bd8efced89f9bd08..9a63e87ea5f3f5d647f1ab0caaf765629e6d41e5 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -601,6 +601,7 @@ 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);
 }