From 39a81cdd7d7b44330451eefaf6daaac80fa8afa9 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Oct 26 2016 02:47:15 +0000
Subject: driver: internals: added the static inlined sfrt_get_driver_ictx() helper.


---

diff --git a/src/internal/sofort_driver_impl.h b/src/internal/sofort_driver_impl.h
index 0808b55..4fdcf96 100644
--- a/src/internal/sofort_driver_impl.h
+++ b/src/internal/sofort_driver_impl.h
@@ -35,4 +35,17 @@ struct sfrt_unit_ctx_impl {
 	struct sfrt_unit_ctx	uctx;
 };
 
+static inline struct sfrt_driver_ctx_impl * sfrt_get_driver_ictx(
+	const struct sfrt_driver_ctx * dctx)
+{
+        uintptr_t addr;
+
+        if (dctx) {
+                addr = (uintptr_t)dctx - offsetof(struct sfrt_driver_ctx_impl,ctx);
+                return (struct sfrt_driver_ctx_impl *)addr;
+        }
+
+        return 0;
+}
+
 #endif