[PATCH] uml: don't roll my own random MAC generator

Use the existing random_ether_addr() instead of cooking up my own
version.  Pointed out by Dave Hollis and Jason Lunz.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 1 insertions, 34 deletions

diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index c067abbbfd97..16aa572325c9 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -310,9 +310,7 @@ static void setup_etheraddr(char *str, unsigned char *addr)
         return;
 
 random:
-        addr[0] = 0xfe;
-        addr[1] = 0xfd;
-        random_mac(addr);
+        random_ether_addr(addr)
 }
 
 static DEFINE_SPINLOCK(devices_lock);
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index 142bcb2c7c6a..f3a3f8a29c7a 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -259,32 +259,3 @@ char *split_if_spec(char *str, ...)
         va_end(ap);
         return str;
 }
-
-void random_mac(unsigned char *addr)
-{
-        struct timeval tv;
-        long n;
-        unsigned int seed;
-
-        gettimeofday(&tv, NULL);
-
-        /* Assume that 20 bits of microseconds and 12 bits of the pid are
-         * reasonably unpredictable.
-         */
-        seed = tv.tv_usec | (os_getpid() << 20);
-        srandom(seed);
-
-        /* Don't care about endianness here - switching endianness
-         * just rearranges what are hopefully random numbers.
-         *
-         * Assume that RAND_MAX > 65536, so random is called twice and
-         * we use 16 bits of the result.
-         */
-        n = random();
-        addr[2] = (n >> 8) & 255;
-        addr[3] = n % 255;
-
-        n = random();
-        addr[4] = (n >> 8) & 255;
-        addr[5] = n % 255;
-}
diff --git a/arch/um/include/net_user.h b/arch/um/include/net_user.h
index 99b3cea2dcdc..19f207cd70fe 100644
--- a/arch/um/include/net_user.h
+++ b/arch/um/include/net_user.h
@@ -50,6 +50,4 @@ extern char *split_if_spec(char *str, ...);
 
 extern int dev_netmask(void *d, void *m);
 
-extern void random_mac(unsigned char *addr);
-
 #endif