X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Ftrace-ust.c;h=5e06a845242b79293d78add5d8f30d4e2bc81579;hb=d8ef542d25837bdfb960e5df2a91c5d18f5ef401;hp=81cb4db63180216b76d42ab3f628788525c06d89;hpb=fdd9eb17f6b6928771744bb40bb2283ce3340033;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 81cb4db63..5e06a8452 100644
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -116,7 +116,8 @@ no_match:
 }
 
 /*
- * Find the channel in the hashtable.
+ * Find the channel in the hashtable and return channel pointer. RCU read side
+ * lock MUST be acquired before calling this.
  */
 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 		char *name)
@@ -124,14 +125,11 @@ struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 	struct lttng_ht_node_str *node;
 	struct lttng_ht_iter iter;
 
-	rcu_read_lock();
 	lttng_ht_lookup(ht, (void *)name, &iter);
 	node = lttng_ht_iter_get_node_str(&iter);
 	if (node == NULL) {
-		rcu_read_unlock();
 		goto error;
 	}
-	rcu_read_unlock();
 
 	DBG2("Trace UST channel %s found by name", name);
 
@@ -143,7 +141,8 @@ error:
 }
 
 /*
- * Find the event in the hashtable.
+ * Find the event in the hashtable and return event pointer. RCU read side lock
+ * MUST be acquired before calling this.
  */
 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
 		char *name, struct lttng_filter_bytecode *filter, int loglevel)
@@ -217,7 +216,7 @@ struct ltt_ust_session *trace_ust_create_session(char *path,
 	lus->tmp_consumer = NULL;
 
 	/* Use the default consumer output which is the tracing session path. */
-	if (path && strlen(path) > 0) {
+	if (*path != '\0') {
 		int ret;
 
 		ret = snprintf(lus->consumer->dst.trace_path, PATH_MAX,
@@ -419,7 +418,7 @@ struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
 
 	lum->handle = -1;
 	/* Set metadata trace path */
-	ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
+	ret = snprintf(lum->pathname, PATH_MAX, "%s/" DEFAULT_METADATA_NAME, path);
 	if (ret < 0) {
 		PERROR("asprintf ust metadata");
 		goto error_free_metadata;