diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tmc-etf.c')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etf.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index d3025634f5e6..8039bd389034 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -538,7 +538,13 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev, lost = true; } - if (lost) + /* + * Don't set the TRUNCATED flag in snapshot mode because 1) the + * captured buffer is expected to be truncated and 2) a full buffer + * prevents the event from being re-enabled by the perf core, + * resulting in stale data being send to user space. + */ + if (!buf->snapshot && lost) perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED); cur = buf->cur; |