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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2018-09-20 13:17:46 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-25 20:09:17 +0200 |
| commit | 987d1e8dcd370d96029a3d76a0031b043c4a69ae (patch) | |
| tree | 88c4edd4ab0e2cbb6b39d413a01e16db90d6c130 | |
| parent | c71369de02b285d9da526a526d8f2affc7b17c59 (diff) | |
| download | linux-987d1e8dcd370d96029a3d76a0031b043c4a69ae.tar.bz2 | |
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>
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etb10.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 306119eaf16a..0dad8626bcfb 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -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; |