X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=lib%2Fringbuffer%2Fring_buffer_frontend.c;h=84341adcd4da6b2b6a06e5e286179d13a90be42b;hb=8202b8a0cca4c5b271c8ff729aa3b572eece6edf;hp=bff920d16a0f6a7a40d3eb2325bb9612a5639273;hpb=7801e9f45613e82205af194218f1910c4640855f;p=lttng-modules.git

diff --git a/lib/ringbuffer/ring_buffer_frontend.c b/lib/ringbuffer/ring_buffer_frontend.c
index bff920d1..84341adc 100644
--- a/lib/ringbuffer/ring_buffer_frontend.c
+++ b/lib/ringbuffer/ring_buffer_frontend.c
@@ -927,6 +927,13 @@ int lib_ring_buffer_get_subbuf(struct lib_ring_buffer *buf,
 	int ret;
 	int finalized;
 
+	if (buf->get_subbuf) {
+		/*
+		 * Reader is trying to get a subbuffer twice.
+		 */
+		CHAN_WARN_ON(chan, 1);
+		return -EBUSY;
+	}
 retry:
 	finalized = ACCESS_ONCE(buf->finalized);
 	/*