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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>
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@ -147,6 +147,10 @@ static int etb_enable(struct coresight_device *csdev, u32 mode)
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if (val == CS_MODE_PERF)
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return -EBUSY;
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/* Don't let perf disturb sysFS sessions */
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if (val == CS_MODE_SYSFS && mode == CS_MODE_PERF)
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return -EBUSY;
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/* Nothing to do, the tracer is already enabled. */
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if (val == CS_MODE_SYSFS)
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goto out;
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