In the perf enable path, there are missing cases where cscfg_csdev_disable_active_config() is not called:
- Branch broadcast is selected but not supported by the hardware - etm4_enable_hw() fails
This can lead to a leak of config_desc->active_cnt. Fix this by properly calling cscfg_csdev_disable_active_config() in these error paths.
Fixes: 810ac401db1f ("coresight: etm4x: Add complex configuration handlers to etmv4") Suggested-by: Leo Yan leo.yan@arm.com Signed-off-by: Yeoreum Yun yeoreum.yun@arm.com --- .../coresight/coresight-etm4x-core.c | 44 +++++++++++-------- 1 file changed, 25 insertions(+), 19 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 8fac6416f3fa..02b91a67b00b 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -785,8 +785,7 @@ static int etm4_parse_event_config(struct coresight_device *csdev, .ATTR_CFG_FLD_timestamp_CFG = U64_MAX, }; struct perf_event_attr *attr = &event->attr; - unsigned long cfg_hash; - int preset, cc_threshold; + int cc_threshold; u8 ts_level;
/* Clear configuration from previous run */ @@ -872,16 +871,6 @@ static int etm4_parse_event_config(struct coresight_device *csdev, /* bit[12], Return stack enable bit */ config->cfg |= TRCCONFIGR_RS;
- /* - * Set any selected configuration and preset. A zero configid means no - * configuration active, preset = 0 means no preset selected. - */ - cfg_hash = ATTR_CFG_GET_FLD(attr, configid); - if (cfg_hash) { - preset = ATTR_CFG_GET_FLD(attr, preset); - ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); - } - /* branch broadcast - enable if selected and supported */ if (ATTR_CFG_GET_FLD(attr, branch_broadcast)) { if (!drvdata->trcbb) { @@ -905,7 +894,9 @@ static int etm4_enable_perf(struct coresight_device *csdev, struct coresight_path *path) { struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - int ret; + struct perf_event_attr *attr = &event->attr; + unsigned long cfg_hash; + int ret, preset;
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) return -EINVAL; @@ -916,7 +907,19 @@ static int etm4_enable_perf(struct coresight_device *csdev, /* Configure the tracer based on the session's specifics */ ret = etm4_parse_event_config(csdev, event); if (ret) - goto out; + goto err; + + /* + * Set any selected configuration and preset. A zero configid means no + * configuration active, preset = 0 means no preset selected. + */ + cfg_hash = ATTR_CFG_GET_FLD(attr, configid); + if (cfg_hash) { + preset = ATTR_CFG_GET_FLD(attr, preset); + ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); + if (ret) + goto err; + }
drvdata->trcid = path->trace_id;
@@ -925,16 +928,19 @@ static int etm4_enable_perf(struct coresight_device *csdev,
/* And enable it */ ret = etm4_enable_hw(drvdata); - -out: - /* Failed to start tracer; roll back to DISABLED mode */ if (ret) { - coresight_set_mode(csdev, CS_MODE_DISABLED); - return ret; + if (cfg_hash) + cscfg_csdev_disable_active_config(csdev); + goto err; }
csdev->path = path; return 0; + +err: + /* Failed to start tracer; roll back to DISABLED mode */ + coresight_set_mode(csdev, CS_MODE_DISABLED); + return ret; }
static int etm4_enable_sysfs(struct coresight_device *csdev, struct coresight_path *path)