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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-09-20 22:17:46 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 21:09:17 +0300
commit987d1e8dcd370d96029a3d76a0031b043c4a69ae (patch)
tree88c4edd4ab0e2cbb6b39d413a01e16db90d6c130 /drivers/hwtracing/coresight/coresight-etb10.c
parentc71369de02b285d9da526a526d8f2affc7b17c59 (diff)
downloadlinux-987d1e8dcd370d96029a3d76a0031b043c4a69ae.tar.xz
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>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etb10.c')
-rw-r--r--drivers/hwtracing/coresight/coresight-etb10.c4
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;