X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=libringbuffer%2Ffrontend.h;h=160fd45532f39573b09178f6924bba71b1f65264;hb=15500a1bb134d6bbd409da5568308c2a41291928;hp=8c8517086828d1fc5c9cf2bf2c780b8a933fc653;hpb=3d3c3833d4d119acde0a3fdb2c472aea010cd7e7;p=lttng-ust.git

diff --git a/libringbuffer/frontend.h b/libringbuffer/frontend.h
index 8c851708..160fd455 100644
--- a/libringbuffer/frontend.h
+++ b/libringbuffer/frontend.h
@@ -162,9 +162,14 @@ static inline
 void lib_ring_buffer_put_next_subbuf(struct lttng_ust_lib_ring_buffer *buf,
 				     struct lttng_ust_shm_handle *handle)
 {
+	struct channel *chan;
+
+	chan = shmp(handle, buf->backend.chan);
+	if (!chan)
+		return;
 	lib_ring_buffer_put_subbuf(buf, handle);
-	lib_ring_buffer_move_consumer(buf, subbuf_align(buf->cons_snapshot,
-							shmp(handle, buf->backend.chan)), handle);
+	lib_ring_buffer_move_consumer(buf, subbuf_align(buf->cons_snapshot, chan),
+			handle);
 }
 
 extern void channel_reset(struct channel *chan);