extmod/btstack: Fix indicate/notify queuing.

This adds a mechanism to track a pending notify/indicate operation that
is deferred due to the send buffer being full. This uses a tracked alloc
that is passed as the content arg to the callback.

This replaces the previous mechanism that did this via the global pending
op queue, shared with client read/write ops.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/py/gc.c b/py/gc.c
index ba5c569d50..ad3e110407 100644
--- a/py/gc.c
+++ b/py/gc.c
@@ -746,7 +746,9 @@ void *gc_alloc_with_finaliser(mp_uint_t n_bytes) {
 // TODO: freeing here does not call finaliser
 void gc_free(void *ptr) {
     if (MP_STATE_THREAD(gc_lock_depth) > 0) {
-        // TODO how to deal with this error?
+        // Cannot free while the GC is locked. However free is an optimisation
+        // to reclaim the memory immediately, this means it will now be left
+        // until the next collection.
         return;
     }