plugins: Simplify plugin/codec API versioning

Replace the minimum version bound with a check on the size of
the API struct. The version only needs to be incremented for
ABI breaking changes. Additions to the API won't need to touch
the version number, resulting in fewer merge conflicts.

Change-Id: I916a04a7bf5890dcf5d615ce30087643165f8e1f

1 files changed, 2 insertions, 3 deletions

diff --git a/apps/plugins/lib/overlay.c b/apps/plugins/lib/overlay.c
index 0ecc1bf3e7..065273534e 100644
--- a/apps/plugins/lib/overlay.c
+++ b/apps/plugins/lib/overlay.c
@@ -83,9 +83,8 @@ enum plugin_status run_overlay(const void* parameter,
         goto error_close;
     }
 
-    
-    if (hdr->api_version > PLUGIN_API_VERSION
-        || hdr->api_version < PLUGIN_MIN_API_VERSION)
+    if (hdr->api_version != PLUGIN_API_VERSION ||
+        p_hdr->api_size > sizeof(struct plugin_api))
     {
         rb->splashf(2*HZ, "%s overlay: Incompatible version.", name);
         goto error_close;