coresight: tmc-etr: Fix perf_data check

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When tracing etm data of multiple threads on multiple cpus through
perf interface, each cpu has a unique etr_perf_buffer while sharing
the same etr device. There is no guarantee that the last cpu starts
etm tracing also stops last. This makes perf_data check fail.

Fix it by checking etr_buf instead of etr_perf_buffer.
Also move the code setting and clearing perf_buf to more suitable
places.

Fixes: 3147da92a8 ("coresight: tmc-etr: Allocate and free ETR memory buffers for CPU-wide scenarios")
Signed-off-by: Yabin Cui <yabinc@google.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20190829202842.580-15-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Yabin Cui 2019-08-29 14:28:39 -06:00 • committed by Greg Kroah-Hartman

parent 13af88f312

commit bbedcb91cc

2 changed files with 7 additions and 7 deletions

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8

drivers/hwtracing/coresight/coresight-tmc-etr.c

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6

drivers/hwtracing/coresight/coresight-tmc.h

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