ust: continue work

[ust.git] / libtracing / channels.c

diff --git a/libtracing/channels.c b/libtracing/channels.c
index 1a23afef473c352e6ea61271c929fad7e599584a..fc0db8ea270bb0c7daa80413e84bd4a0f997619e 100644 (file)
--- 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;