[rtems commit] bsp/mpc55xx: Avoid integer overflow

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    d91d50f638748fb3fbcd796180c44a33e61fb731
Changeset: http://git.rtems.org/rtems/commit/?id=d91d50f638748fb3fbcd796180c44a33e61fb731

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Tue Jul  2 15:14:51 2013 +0200

bsp/mpc55xx: Avoid integer overflow

---

 .../powerpc/mpc55xxevb/startup/get-system-clock.c  |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c b/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c
index bd4c769..f0db872 100644
--- a/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c
+++ b/c/src/lib/libbsp/powerpc/mpc55xxevb/startup/get-system-clock.c
@@ -63,8 +63,8 @@ uint32_t mpc55xx_get_system_clock(void)
       uint32_t emfd = esyncr1.B.EMFD;
       uint32_t erfd = esyncr2.B.ERFD;
 
-      system_clock = (reference_clock * (emfd + 16))
-        / ((erfd + 1) * (eprediv + 1));
+      system_clock = ((reference_clock / (eprediv + 1)) * (emfd + 16))
+        / (erfd + 1);
     } else {
       system_clock = reference_clock;
     }