From: Suzuki K Poulose <suzuki.poul...@arm.com>
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.poir...@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poul...@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
drivers/hwtracing/coresight/coresight-etb10.c | 4 ++++
1 file changed, 4 insertions(+)
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;
--
2.7.4
