Commit 987d1e8d authored Sep 20, 2018 by Suzuki K Poulose Committed by Greg Kroah-Hartman Sep 25, 2018

coresight: etb10: Fix handling of perf mode



If the ETB is already enabled in sysfs mode, the ETB reports
success even if a perf mode is requested. Fix this by checking
the requested mode.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent c71369de

drivers/hwtracing/coresight/coresight-etb10.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -147,6 +147,10 @@ static int etb_enable(struct coresight_device *csdev, u32 mode)
		if (val == CS_MODE_PERF)
		return -EBUSY;

		/* Don't let perf disturb sysFS sessions */
		if (val == CS_MODE_SYSFS && mode == CS_MODE_PERF)
		return -EBUSY;

		/* Nothing to do, the tracer is already enabled. */
		if (val == CS_MODE_SYSFS)
		goto out;

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