X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=libtracing%2Fchannels.c;h=fc0db8ea270bb0c7daa80413e84bd4a0f997619e;hb=5f54827b88b093974e4bf58f67490036718644c7;hp=1a23afef473c352e6ea61271c929fad7e599584a;hpb=b6bf28ecd4c07e7865d340f1600a35d6edc05ec8;p=lttng-ust.git

diff --git a/libtracing/channels.c b/libtracing/channels.c
index 1a23afef..fc0db8ea 100644
--- a/libtracing/channels.c
+++ b/libtracing/channels.c
@@ -16,6 +16,7 @@
 
 #include "kernelcompat.h"
 #include "channels.h"
+#include "usterr.h"
 
 /*
  * ltt_channel_mutex may be nested inside the LTT trace mutex.
@@ -239,8 +240,10 @@ struct ltt_channel_struct *ltt_channels_trace_alloc(unsigned int *nr_channels,
 	struct ltt_channel_setting *iter;
 
 	mutex_lock(&ltt_channel_mutex);
-	if (!free_index)
+	if (!free_index) {
+		WARN("ltt_channels_trace_alloc: no free_index; are there any probes connected?");
 		goto end;
+	}
 	if (!atomic_read(&index_kref.refcount))
 		kref_init(&index_kref);
 	else
@@ -248,8 +251,10 @@ struct ltt_channel_struct *ltt_channels_trace_alloc(unsigned int *nr_channels,
 	*nr_channels = free_index;
 	channel = kzalloc(sizeof(struct ltt_channel_struct) * free_index,
 			  GFP_KERNEL);
-	if (!channel)
+	if (!channel) {
+		WARN("ltt_channel_struct: channel null after alloc");
 		goto end;
+	}
 	list_for_each_entry(iter, &ltt_channels, list) {
 		if (!atomic_read(&iter->kref.refcount))
 			continue;