[rtems commit] bsps: Copy FDT only if source != destination

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    178180aa1c3f8804900476d1c671c2f090c0eea9
Changeset: http://git.rtems.org/rtems/commit/?id=178180aa1c3f8804900476d1c671c2f090c0eea9

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Fri Apr 22 13:02:55 2016 +0200

bsps: Copy FDT only if source != destination

---

 c/src/lib/libbsp/shared/src/bsp-fdt.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/c/src/lib/libbsp/shared/src/bsp-fdt.c b/c/src/lib/libbsp/shared/src/bsp-fdt.c
index 1b149d9..635cb85 100644
--- a/c/src/lib/libbsp/shared/src/bsp-fdt.c
+++ b/c/src/lib/libbsp/shared/src/bsp-fdt.c
@@ -42,15 +42,18 @@ void bsp_fdt_copy(const void *src)
 #else
   uint32_t *d = &bsp_fdt_blob[0];
 #endif
-  uint32_t m = MIN(sizeof(bsp_fdt_blob), fdt_totalsize(src));
-  uint32_t n = (m + sizeof(*d) - 1) / sizeof(*d);
-  uint32_t i;
 
-  for (i = 0; i < n; ++i) {
-    d[i] = s[i];
-  }
+  if (s != d) {
+    uint32_t m = MIN(sizeof(bsp_fdt_blob), fdt_totalsize(src));
+    uint32_t n = (m + sizeof(*d) - 1) / sizeof(*d);
+    uint32_t i;
+
+    for (i = 0; i < n; ++i) {
+      d[i] = s[i];
+    }
 
-  rtems_cache_flush_multiple_data_lines(d, m);
+    rtems_cache_flush_multiple_data_lines(d, m);
+  }
 }
 
 const void *bsp_fdt_get(void)