[PATCH] (4/4) use system get_random_bytes in hdlcdrv

[Stephen Hemminger <shemminger@xxxxxxxx>]

Real random numbers aren't important here, but having custom
random number generate seems silly when linux kernel has good
way to get random data.

diff -Nru a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
--- a/drivers/net/hamradio/hdlcdrv.c    Fri Sep 19 13:18:58 2003
+++ b/drivers/net/hamradio/hdlcdrv.c    Fri Sep 19 13:18:58 2003
@@ -52,6 +52,7 @@
 #include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/init.h>
+#include <linux/random.h>
 #include <asm/bitops.h>
 #include <asm/uaccess.h>
 
@@ -434,18 +435,10 @@
 
 /* ---------------------------------------------------------------------- */
 
-static unsigned short random_seed;
-
-static inline unsigned short random_num(void)
-{
-       random_seed = 28629 * random_seed + 157;
-       return random_seed;
-}
-
-/* ---------------------------------------------------------------------- */
-
 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
 {
+       u8 prand;
+
        if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) 
                return;
        if (s->ch_params.fulldup) {
@@ -459,7 +452,9 @@
        if ((--s->hdlctx.slotcnt) > 0)
                return;
        s->hdlctx.slotcnt = s->ch_params.slottime;
-       if ((random_num() % 256) > s->ch_params.ppersist)
+
+       get_random_bytes(&prand, sizeof(prand));
+       if (prand > s->ch_params.ppersist)
                return;
        start_tx(dev, s);
 }