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Date: Fri, 16 Feb 2007 09:42:31 -0800
From: Joe Perches <joe@...ches.com>
To: Thomas Sailer <t.sailer@...mni.ethz.ch>,
Ralf Baechle <ralf@...ux-mips.org>
Cc: netdev@...r.kernel.org, linux-hams@...r.kernel.org, jpr@...bb.org
Subject: Re: [PATCH] - drivers/net/hamradio remove local random function,
use random32()
On Fri, 2007-02-16 at 11:50 +0100, Thomas Sailer wrote:
> On Thu, 2007-02-15 at 19:36 -0800, Joe Perches wrote:
> > remove local random function, use random32() instead
> > > Signed-off-by: Joe Perches <joe@...ches.com>
> Acked-By: Thomas Sailer <t.sailer@...mni.ethz.ch>
>
> There are a bunch of other drivers with their homegrown random number
> function, namely 6pack.c dmascc.c hdlcdrv.c yam.c.
>
> Can you do a patch for those too?
hamradio files with random functions converted to random32()
Signed-off-by: Joe Perches <joe@...ches.com>
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 760d04a..01c5e1d 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -24,6 +24,7 @@
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
+#include <linux/random.h>
#include <net/ax25.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
@@ -142,11 +143,9 @@ static void sp_xmit_on_air(unsigned long channel)
{
struct sixpack *sp = (struct sixpack *) channel;
int actual, when = sp->slottime;
- static unsigned char random;
- random = random * 17 + 41;
-
- if (((sp->status1 & SIXP_DCD_MASK) == 0) && (random < sp->persistence)) {
+ if (((sp->status1 & SIXP_DCD_MASK) == 0)
+ && ((unsigned char)random32() < sp->persistence)) {
sp->led_state = 0x70;
sp->tty->driver->write(sp->tty, &sp->led_state, 1);
sp->tx_enable = 1;
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 153b6dc..84aa211 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -52,6 +52,7 @@
#include <linux/hdlcdrv.h>
#include <linux/baycom.h>
#include <linux/jiffies.h>
+#include <linux/random.h>
#include <net/ax25.h>
#include <asm/uaccess.h>
@@ -433,16 +434,6 @@ static void encode_hdlc(struct baycom_state *bc)
/* ---------------------------------------------------------------------- */
-static unsigned short random_seed;
-
-static inline unsigned short random_num(void)
-{
- random_seed = 28629 * random_seed + 157;
- return random_seed;
-}
-
-/* ---------------------------------------------------------------------- */
-
static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
{
struct parport *pp = bc->pdev->port;
@@ -464,7 +455,7 @@ static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
if ((--bc->hdlctx.slotcnt) > 0)
return 0;
bc->hdlctx.slotcnt = bc->ch_params.slottime;
- if ((random_num() % 256) > bc->ch_params.ppersist)
+ if ((random32() % 256) > bc->ch_params.ppersist)
return 0;
}
}
diff --git a/drivers/net/hamradio/dmascc.c b/drivers/net/hamradio/dmascc.c
index 0fbb414..0526a22 100644
--- a/drivers/net/hamradio/dmascc.c
+++ b/drivers/net/hamradio/dmascc.c
@@ -34,6 +34,7 @@
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <linux/workqueue.h>
+#include <linux/random.h>
#include <asm/atomic.h>
#include <asm/bitops.h>
#include <asm/dma.h>
@@ -246,7 +247,6 @@ static inline void tx_on(struct scc_priv *priv);
static inline void rx_on(struct scc_priv *priv);
static inline void rx_off(struct scc_priv *priv);
static void start_timer(struct scc_priv *priv, int t, int r15);
-static inline unsigned char random(void);
static inline void z8530_isr(struct scc_info *info);
static irqreturn_t scc_isr(int irq, void *dev_id);
@@ -269,7 +269,6 @@ static struct scc_hardware hw[NUM_TYPES] __initdata_or_module = HARDWARE;
/* Global variables */
static struct scc_info *first;
-static unsigned long rand;
MODULE_AUTHOR("Klaus Kudielka");
@@ -314,8 +313,6 @@ static int __init dmascc_init(void)
unsigned long time, start[MAX_NUM_DEVS], delay[MAX_NUM_DEVS],
counting[MAX_NUM_DEVS];
- /* Initialize random number generator */
- rand = jiffies;
/* Cards found = 0 */
n = 0;
/* Warning message */
@@ -1099,13 +1096,6 @@ static void start_timer(struct scc_priv *priv, int t, int r15)
}
-static inline unsigned char random(void)
-{
- /* See "Numerical Recipes in C", second edition, p. 284 */
- rand = rand * 1664525L + 1013904223L;
- return (unsigned char) (rand >> 24);
-}
-
static inline void z8530_isr(struct scc_info *info)
{
int is, i = 100;
@@ -1466,7 +1456,8 @@ static void tm_isr(struct scc_priv *priv)
} else {
priv->state = WAIT;
start_timer(priv,
- random() / priv->param.persist *
+ (unsigned char)random32() /
+ priv->param.persist *
priv->param.slottime, DCDIE);
}
break;
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index 452873e..f5a17ad 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -56,6 +56,7 @@
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/hdlcdrv.h>
+#include <linux/random.h>
#include <net/ax25.h>
#include <asm/uaccess.h>
@@ -371,16 +372,6 @@ static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
/* ---------------------------------------------------------------------- */
-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)
{
if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
@@ -396,7 +387,7 @@ void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
if ((--s->hdlctx.slotcnt) > 0)
return;
s->hdlctx.slotcnt = s->ch_params.slottime;
- if ((random_num() % 256) > s->ch_params.ppersist)
+ if ((random32() % 256) > s->ch_params.ppersist)
return;
start_tx(dev, s);
}
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 6d74f08..efc0bcd 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -50,6 +50,7 @@
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/bitops.h>
+#include <linux/random.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/interrupt.h>
@@ -566,14 +567,6 @@ static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
ptt_on(dev);
}
-static unsigned short random_seed;
-
-static inline unsigned short random_num(void)
-{
- random_seed = 28629 * random_seed + 157;
- return random_seed;
-}
-
static void yam_arbitrate(struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
@@ -600,7 +593,7 @@ static void yam_arbitrate(struct net_device *dev)
yp->slotcnt = yp->slot / 10;
/* is random > persist ? */
- if ((random_num() % 256) > yp->pers)
+ if ((random32() % 256) > yp->pers)
return;
yam_start_tx(dev, yp);
-
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