Avoid epoll errors to be fired indefinitely

When a audio card with control event generation is removed,
avoid epoll errors to be fired indefinitely by event loop.

Bug-AGL: SPEC-2749

Change-Id: I65dddc2f9714fa2303773b212bc3cad7cb164d73
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>

1 files changed, 6 insertions, 0 deletions

diff --git a/alsa-binding/Alsa-RegEvt.c b/alsa-binding/Alsa-RegEvt.c
index 974431e..36bb590 100644
--- a/alsa-binding/Alsa-RegEvt.c
+++ b/alsa-binding/Alsa-RegEvt.c
@@ -101,6 +101,12 @@ STATIC int sndCtlEventCB(sd_event_source* src, int fd, uint32_t revents, void* u
     ctlRequestT ctlRequest;
     snd_ctl_elem_id_t *elemId;
 
+    if ((revents & EPOLLERR) != 0) {
+        AFB_ERROR("An error has been send by event loop polling, prevent new errors to be fired by deleting event src");
+        sd_event_source_unref(src);
+        return -1;
+    }
+
     if ((revents & EPOLLHUP) != 0) {
         AFB_NOTICE("SndCtl hanghup [car disconnected]");
         goto ExitOnSucess;