Commit 987d1e8d authored by Suzuki K Poulose's avatar Suzuki K Poulose Committed by Greg Kroah-Hartman

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: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c71369de
...@@ -147,6 +147,10 @@ static int etb_enable(struct coresight_device *csdev, u32 mode) ...@@ -147,6 +147,10 @@ static int etb_enable(struct coresight_device *csdev, u32 mode)
if (val == CS_MODE_PERF) if (val == CS_MODE_PERF)
return -EBUSY; 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. */ /* Nothing to do, the tracer is already enabled. */
if (val == CS_MODE_SYSFS) if (val == CS_MODE_SYSFS)
goto out; goto out;
......
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