shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-06 10:58:48 +09:00
Code Issues Packages Projects Releases Wiki Activity

coresight: etb10: Fix handling of perf mode

Browse Source 
[ Upstream commit 987d1e8dcd ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose
2018-09-20 13:17:46 -06:00
committed by Greg Kroah-Hartman
parent a8433138c4
commit 2048b787ca
1 changed files with 4 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/hwtracing/coresight/coresight-etb10.c
View File

@@ -155,6 +155,10 @@ 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;