diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S
index f99f174..52d6f73 100644
--- a/arch/blackfin/mach-bf561/atomic.S
+++ b/arch/blackfin/mach-bf561/atomic.S
@@ -49,6 +49,7 @@
 	jump .Lretry_corelock
 .Ldone_corelock:
 	p0 = r1;
+	/* flush core internal write buffer before invalidate dcache */
 	CSYNC(r2);
 	flushinv[p0];
 	SSYNC(r2);
@@ -685,6 +686,8 @@
 	r1 = -L1_CACHE_BYTES;
 	r1 = r0 & r1;
 	p0 = r1;
+	/* flush core internal write buffer before invalidate dcache */
+	CSYNC(r2);
 	flushinv[p0];
 	SSYNC(r2);
 	r0 = [p1];
@@ -907,6 +910,8 @@
 	r1 = -L1_CACHE_BYTES;
 	r1 = r0 & r1;
 	p0 = r1;
+	/* flush core internal write buffer before invalidate dcache */
+	CSYNC(r2);
 	flushinv[p0];
 	SSYNC(r2);
 	r0 = [p1];