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coresight: etb10: Fix handling of perf mode

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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 <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Mathieu Poirier <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:17:46 -06:00 • committed by Greg Kroah-Hartman
commit 987d1e8dcd
1 changed files with 4 additions and 0 deletions
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4
drivers/hwtracing/coresight/coresight-etb10.c
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@ -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;