[PATCH v8 09/13] coresight: etm4x: missing cscfg_csdev_disable_active_config() in perf enable

[Yeoreum Yun]

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 at arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun at 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 31ac7783fdb8..f32943b0669a 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -794,8 +794,7 @@ 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 */
@@ -881,16 +880,6 @@ 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 (!caps->trcbb) {
@@ -914,7 +903,9 @@ 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;
@@ -925,7 +916,19 @@ 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;
 
@@ -934,16 +937,19 @@ 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)
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}