Fix: event-notifier: do not flush packet if it only contains subbuf header

[lttng-modules.git] / src / lttng-abi.c

diff --git a/src/lttng-abi.c b/src/lttng-abi.c
index 1b08b3b7412270ff2199ab3d3bde1e379ca23370..09e437884c8e54971dad9597d6f517cb8cf660fc 100644 (file)
--- a/src/lttng-abi.c
+++ b/src/lttng-abi.c
@@ -933,6 +933,7 @@ unsigned int lttng_event_notifier_group_notif_poll(struct file *filp,
        const struct lib_ring_buffer_config *config = &chan->backend.config;
        int finalized, disabled;
        unsigned long consumed, offset;
+       size_t subbuffer_header_size = config->cb.subbuffer_header_size();
 
        if (filp->f_mode & FMODE_READ) {
                poll_wait_set_exclusive(wait);
@@ -960,7 +961,7 @@ retry:
                        /*
                         * If there is a non-empty subbuffer, flush and try again.
                         */
-                       if (subbuf_offset(offset, chan) != 0) {
+                       if (subbuf_offset(offset, chan) > subbuffer_header_size) {
                                lib_ring_buffer_switch_remote(buf);
                                goto retry;
                        }