The net_random_ethaddr() tries to get some entropy from different startup times of a board. The seed is initialized with get_timer() which has only a granularity of milliseconds. We can do better if we use get_ticks() which returns the raw timer ticks. Using this we have a higher chance of getting different values at startup.
Signed-off-by: Michael Walle michael@walle.cc --- include/net.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net.h b/include/net.h index a54d5eeac5..8215316bd3 100644 --- a/include/net.h +++ b/include/net.h @@ -816,7 +816,7 @@ static inline int is_valid_ethaddr(const u8 *addr) static inline void net_random_ethaddr(uchar *addr) { int i; - unsigned int seed = get_timer(0); + unsigned int seed = get_ticks() & (unsigned int)-1;
for (i = 0; i < 6; i++) addr[i] = rand_r(&seed);