diff options
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etr.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 2d6f428176ff..bafd73e71c4c 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1168,19 +1168,17 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) goto out; } - /* Don't interfere if operated from Perf */ - if (drvdata->mode == CS_MODE_PERF) { - ret = -EINVAL; - goto out; - } - - /* If sysfs_buf is NULL the trace data has been read already */ + /* + * We can safely allow reads even if the ETR is operating in PERF mode, + * since the sysfs session is captured in mode specific data. + * If drvdata::sysfs_data is NULL the trace data has been read already. + */ if (!drvdata->sysfs_buf) { ret = -EINVAL; goto out; } - /* Disable the TMC if we are trying to read from a running session */ + /* Disable the TMC if we are trying to read from a running session. */ if (drvdata->mode == CS_MODE_SYSFS) tmc_etr_disable_hw(drvdata); |