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Date: Mon, 8 Oct 2007 17:58:36 +0200
From: Karsten Keil <kkeil@...e.de>
To: Andreas Mohr <andi@...as.de>
Cc: Jeff Garzik <jeff@...zik.org>, isdn4linux@...tserv.isdn4linux.de,
netdev@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: 2.6.23-rc8-mm2 BUG: register_netdevice() issue as (ab)used by ISDN
On Sun, Oct 07, 2007 at 07:20:37PM +0200, Andreas Mohr wrote:
> Hi,
>
> On Sun, Oct 07, 2007 at 03:17:24PM +0200, Andreas Mohr wrote:
> > I thus decided to now try plain 2.6.23-rc8 whether it's "corrupted", too.
>
> OK, after 3 hours of compilation the ONLY datapoint I can give right now is:
> 1 (one) boot on 2.6.23-rc8-mm2 had the BUG in /var/log/messages,
> 1 (one) boot on 2.6.23-rc8 did NOT have it.
>
> The two .config:s (I did a make oldconfig when going back to
> non-mm2) don't seem to have any relevant differences.
>
> I could offer to do more testing on this machine,
> but this carries a slight risk for me since I (personally) won't have physical
> access to it for a couple days and some people will kill me if the main
> internet gateway happened to go down unfixably. ;)
>
You could try following patch with 2.6.23-rc8-mm2, it change I4L to use
alloc_netdev().
Signed-off-by: Karsten Keil <kkeil@...e.de>
diff -ur linux-2.6.23-rc9.org/drivers/isdn/i4l/isdn_net.c linux-2.6.23-rc9/drivers/isdn/i4l/isdn_net.c
--- linux-2.6.23-rc9.org/drivers/isdn/i4l/isdn_net.c 2007-10-08 12:01:22.000000000 +0200
+++ linux-2.6.23-rc9/drivers/isdn/i4l/isdn_net.c 2007-10-08 17:31:43.000000000 +0200
@@ -77,7 +77,7 @@
if (lp->master)
dev = lp->master;
else
- dev = &n->dev;
+ dev = n->dev;
return netif_running(dev);
}
@@ -90,7 +90,7 @@
if (lp->master)
netif_wake_queue(lp->master);
else
- netif_wake_queue(&lp->netdev->dev);
+ netif_wake_queue(lp->netdev->dev);
}
/*
@@ -102,7 +102,7 @@
if (lp->master)
netif_stop_queue(lp->master);
else
- netif_stop_queue(&lp->netdev->dev);
+ netif_stop_queue(lp->netdev->dev);
}
/*
@@ -287,7 +287,7 @@
BEWARE! This chunk of code cannot be called from hardware
interrupt handler. I hope it is true. --ANK
*/
- qdisc_reset(lp->netdev->dev.qdisc);
+ qdisc_reset(lp->netdev->dev->qdisc);
}
lp->dialstate = 0;
dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
@@ -345,27 +345,27 @@
l->chargetime += l->chargeint;
if (time_after(jiffies, l->chargetime + l->chargeint - 2 * HZ))
if (l->outgoing || l->hupflags & ISDN_INHUP)
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
} else if (l->outgoing) {
if (l->hupflags & ISDN_CHARGEHUP) {
if (l->hupflags & ISDN_WAITCHARGE) {
printk(KERN_DEBUG "isdn_net: Hupflags of %s are %X\n",
l->name, l->hupflags);
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
} else if (time_after(jiffies, l->chargetime + l->chargeint)) {
printk(KERN_DEBUG
"isdn_net: %s: chtime = %lu, chint = %d\n",
l->name, l->chargetime, l->chargeint);
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
}
} else
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
} else if (l->hupflags & ISDN_INHUP)
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
}
if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*l) == ISDN_NET_DM_OFF)) {
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
break;
}
}
@@ -579,7 +579,7 @@
if (!lp->dial) {
printk(KERN_WARNING "%s: phone number deleted?\n",
lp->name);
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
break;
}
anymore = 1;
@@ -616,8 +616,8 @@
s = "dial suppressed: isdn system stopped";
else
s = "dial suppressed: dialmode `off'";
- isdn_net_unreachable(&p->dev, NULL, s);
- isdn_net_hangup(&p->dev);
+ isdn_net_unreachable(p->dev, NULL, s);
+ isdn_net_hangup(p->dev);
break;
}
cmd.driver = lp->isdn_device;
@@ -633,7 +633,7 @@
if (!lp->dial) {
printk(KERN_WARNING "%s: phone number deleted?\n",
lp->name);
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
break;
}
if (!strncmp(lp->dial->num, "LEASED", strlen("LEASED"))) {
@@ -644,8 +644,8 @@
if (time_after(jiffies, lp->dialstarted + lp->dialtimeout)) {
lp->dialwait_timer = jiffies + lp->dialwait;
lp->dialstarted = 0;
- isdn_net_unreachable(&p->dev, NULL, "dial: timed out");
- isdn_net_hangup(&p->dev);
+ isdn_net_unreachable(p->dev, NULL, "dial: timed out");
+ isdn_net_hangup(p->dev);
break;
}
@@ -674,9 +674,9 @@
if (lp->dialtimeout == 0) {
lp->dialwait_timer = jiffies + lp->dialwait;
lp->dialstarted = 0;
- isdn_net_unreachable(&p->dev, NULL, "dial: tried all numbers dialmax times");
+ isdn_net_unreachable(p->dev, NULL, "dial: tried all numbers dialmax times");
}
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
break;
}
}
@@ -758,7 +758,7 @@
cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
isdn_command(&cmd);
if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT15)
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
else {
anymore = 1;
lp->dialstate++;
@@ -781,7 +781,7 @@
printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
#endif
if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
else
anymore = 1;
break;
@@ -1618,7 +1618,7 @@
__be32 addr = 0; /* local ipv4 address */
__be32 mask = 0; /* local netmask */
- if ((in_dev = lp->netdev->dev.ip_ptr) != NULL) {
+ if ((in_dev = lp->netdev->dev->ip_ptr) != NULL) {
/* take primary(first) address of interface */
struct in_ifaddr *ifa = in_dev->ifa_list;
if (ifa != NULL) {
@@ -1866,7 +1866,7 @@
isdn_net_local *lp = p->local;
if ((lp->flags & ISDN_NET_CONNECTED) &&
(!lp->dialstate)) {
- isdn_net_receive(&p->dev, skb);
+ isdn_net_receive(p->dev, skb);
return 1;
}
}
@@ -2531,6 +2531,42 @@
}
/*
+ * Helper for alloc_netdev()
+ */
+static void _isdn_setup(struct net_device *dev)
+{
+ isdn_net_local *lp = dev->priv;
+
+ dev->flags = IFF_NOARP | IFF_POINTOPOINT;
+ lp->p_encap = ISDN_NET_ENCAP_RAWIP;
+ lp->magic = ISDN_NET_MAGIC;
+ lp->last = lp;
+ lp->next = lp;
+ lp->isdn_device = -1;
+ lp->isdn_channel = -1;
+ lp->pre_device = -1;
+ lp->pre_channel = -1;
+ lp->exclusive = -1;
+ lp->ppp_slot = -1;
+ lp->pppbind = -1;
+ skb_queue_head_init(&lp->super_tx_queue);
+ lp->l2_proto = ISDN_PROTO_L2_X75I;
+ lp->l3_proto = ISDN_PROTO_L3_TRANS;
+ lp->triggercps = 6000;
+ lp->slavedelay = 10 * HZ;
+ lp->hupflags = ISDN_INHUP; /* Do hangup even on incoming calls */
+ lp->onhtime = 10; /* Default hangup-time for saving costs */
+ lp->dialmax = 1;
+ /* Hangup before Callback, manual dial */
+ lp->flags = ISDN_NET_CBHUP | ISDN_NET_DM_MANUAL;
+ lp->cbdelay = 25; /* Wait 5 secs before Callback */
+ lp->dialtimeout = -1; /* Infinite Dial-Timeout */
+ lp->dialwait = 5 * HZ; /* Wait 5 sec. after failed dial */
+ lp->dialstarted = 0; /* Jiffies of last dial-start */
+ lp->dialwait_timer = 0; /* Jiffies of earliest next dial-start */
+}
+
+/*
* Allocate a new network-interface and initialize its data structures.
*/
char *
@@ -2543,23 +2579,21 @@
printk(KERN_WARNING "isdn_net: interface %s already exists\n", name);
return NULL;
}
+ if (name == NULL)
+ name = " ";
if (!(netdev = kzalloc(sizeof(isdn_net_dev), GFP_KERNEL))) {
printk(KERN_WARNING "isdn_net: Could not allocate net-device\n");
return NULL;
}
- if (!(netdev->local = kzalloc(sizeof(isdn_net_local), GFP_KERNEL))) {
- printk(KERN_WARNING "isdn_net: Could not allocate device locals\n");
+ netdev->dev = alloc_netdev(sizeof(isdn_net_local), name, _isdn_setup);
+ if (!netdev->dev) {
+ printk(KERN_WARNING "isdn_net: Could not allocate network device\n");
kfree(netdev);
return NULL;
}
- if (name == NULL)
- strcpy(netdev->local->name, " ");
- else
- strcpy(netdev->local->name, name);
- strcpy(netdev->dev.name, netdev->local->name);
- netdev->dev.priv = netdev->local;
- netdev->dev.init = isdn_net_init;
- netdev->local->p_encap = ISDN_NET_ENCAP_RAWIP;
+ netdev->local = netdev->dev->priv;
+ strcpy(netdev->local->name, netdev->dev->name);
+ netdev->dev->init = isdn_net_init;
if (master) {
/* Device shall be a slave */
struct net_device *p = (((isdn_net_local *) master->priv)->slave);
@@ -2571,60 +2605,33 @@
q = p;
p = (((isdn_net_local *) p->priv)->slave);
}
- ((isdn_net_local *) q->priv)->slave = &(netdev->dev);
+ ((isdn_net_local *) q->priv)->slave = netdev->dev;
} else {
/* Device shall be a master */
/*
* Watchdog timer (currently) for master only.
*/
- netdev->dev.tx_timeout = isdn_net_tx_timeout;
- netdev->dev.watchdog_timeo = ISDN_NET_TX_TIMEOUT;
- if (register_netdev(&netdev->dev) != 0) {
+ netdev->dev->tx_timeout = isdn_net_tx_timeout;
+ netdev->dev->watchdog_timeo = ISDN_NET_TX_TIMEOUT;
+ if (register_netdev(netdev->dev) != 0) {
printk(KERN_WARNING "isdn_net: Could not register net-device\n");
- kfree(netdev->local);
+ free_netdev(netdev->dev);
kfree(netdev);
return NULL;
}
}
- netdev->local->magic = ISDN_NET_MAGIC;
-
netdev->queue = netdev->local;
spin_lock_init(&netdev->queue_lock);
- netdev->local->last = netdev->local;
netdev->local->netdev = netdev;
- netdev->local->next = netdev->local;
INIT_WORK(&netdev->local->tqueue, isdn_net_softint);
spin_lock_init(&netdev->local->xmit_lock);
- netdev->local->isdn_device = -1;
- netdev->local->isdn_channel = -1;
- netdev->local->pre_device = -1;
- netdev->local->pre_channel = -1;
- netdev->local->exclusive = -1;
- netdev->local->ppp_slot = -1;
- netdev->local->pppbind = -1;
- skb_queue_head_init(&netdev->local->super_tx_queue);
- netdev->local->l2_proto = ISDN_PROTO_L2_X75I;
- netdev->local->l3_proto = ISDN_PROTO_L3_TRANS;
- netdev->local->triggercps = 6000;
- netdev->local->slavedelay = 10 * HZ;
- netdev->local->hupflags = ISDN_INHUP; /* Do hangup even on incoming calls */
- netdev->local->onhtime = 10; /* Default hangup-time for saving costs
- of those who forget configuring this */
- netdev->local->dialmax = 1;
- netdev->local->flags = ISDN_NET_CBHUP | ISDN_NET_DM_MANUAL; /* Hangup before Callback, manual dial */
- netdev->local->cbdelay = 25; /* Wait 5 secs before Callback */
- netdev->local->dialtimeout = -1; /* Infinite Dial-Timeout */
- netdev->local->dialwait = 5 * HZ; /* Wait 5 sec. after failed dial */
- netdev->local->dialstarted = 0; /* Jiffies of last dial-start */
- netdev->local->dialwait_timer = 0; /* Jiffies of earliest next dial-start */
-
/* Put into to netdev-chain */
netdev->next = (void *) dev->netdev;
dev->netdev = netdev;
- return netdev->dev.name;
+ return netdev->dev->name;
}
char *
@@ -2649,7 +2656,7 @@
/* Master must not be started yet */
if (isdn_net_device_started(n))
return NULL;
- return (isdn_net_new(newname, &(n->dev)));
+ return (isdn_net_new(newname, n->dev));
}
return NULL;
}
@@ -2718,9 +2725,9 @@
lp->name);
return -EINVAL;
#else
- p->dev.type = ARPHRD_PPP; /* change ARP type */
- p->dev.addr_len = 0;
- p->dev.do_ioctl = isdn_ppp_dev_ioctl;
+ p->dev->type = ARPHRD_PPP; /* change ARP type */
+ p->dev->addr_len = 0;
+ p->dev->do_ioctl = isdn_ppp_dev_ioctl;
#endif
break;
case ISDN_NET_ENCAP_X25IFACE:
@@ -2729,12 +2736,12 @@
p->local->name);
return -EINVAL;
#else
- p->dev.type = ARPHRD_X25; /* change ARP type */
- p->dev.addr_len = 0;
+ p->dev->type = ARPHRD_X25; /* change ARP type */
+ p->dev->addr_len = 0;
#endif
break;
case ISDN_NET_ENCAP_CISCOHDLCK:
- p->dev.do_ioctl = isdn_ciscohdlck_dev_ioctl;
+ p->dev->do_ioctl = isdn_ciscohdlck_dev_ioctl;
break;
default:
if( cfg->p_encap >= 0 &&
@@ -2861,20 +2868,20 @@
}
if (cfg->p_encap != lp->p_encap) {
if (cfg->p_encap == ISDN_NET_ENCAP_RAWIP) {
- p->dev.hard_header = NULL;
- p->dev.hard_header_cache = NULL;
- p->dev.header_cache_update = NULL;
- p->dev.flags = IFF_NOARP|IFF_POINTOPOINT;
+ p->dev->hard_header = NULL;
+ p->dev->hard_header_cache = NULL;
+ p->dev->header_cache_update = NULL;
+ p->dev->flags = IFF_NOARP|IFF_POINTOPOINT;
} else {
- p->dev.hard_header = isdn_net_header;
+ p->dev->hard_header = isdn_net_header;
if (cfg->p_encap == ISDN_NET_ENCAP_ETHER) {
- p->dev.hard_header_cache = lp->org_hhc;
- p->dev.header_cache_update = lp->org_hcu;
- p->dev.flags = IFF_BROADCAST | IFF_MULTICAST;
+ p->dev->hard_header_cache = lp->org_hhc;
+ p->dev->header_cache_update = lp->org_hcu;
+ p->dev->flags = IFF_BROADCAST | IFF_MULTICAST;
} else {
- p->dev.hard_header_cache = NULL;
- p->dev.header_cache_update = NULL;
- p->dev.flags = IFF_NOARP|IFF_POINTOPOINT;
+ p->dev->hard_header_cache = NULL;
+ p->dev->header_cache_update = NULL;
+ p->dev->flags = IFF_NOARP|IFF_POINTOPOINT;
}
}
}
@@ -3095,7 +3102,7 @@
isdn_net_hangup(q);
q = (((isdn_net_local *) q->priv)->slave);
}
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
return 0;
}
return -ENODEV;
@@ -3123,13 +3130,13 @@
isdn_unexclusive_channel(p->local->pre_device, p->local->pre_channel);
if (p->local->master) {
/* It's a slave-device, so update master's slave-pointer if necessary */
- if (((isdn_net_local *) (p->local->master->priv))->slave == &p->dev)
+ if (((isdn_net_local *) (p->local->master->priv))->slave == p->dev)
((isdn_net_local *) (p->local->master->priv))->slave = p->local->slave;
} else {
/* Unregister only if it's a master-device */
- p->dev.hard_header_cache = p->local->org_hhc;
- p->dev.header_cache_update = p->local->org_hcu;
- unregister_netdev(&p->dev);
+ p->dev->hard_header_cache = p->local->org_hhc;
+ p->dev->header_cache_update = p->local->org_hcu;
+ unregister_netdev(p->dev);
}
/* Unlink device from chain */
spin_lock_irqsave(&dev->lock, flags);
@@ -3157,7 +3164,7 @@
/* If no more net-devices remain, disable auto-hangup timer */
if (dev->netdev == NULL)
isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
- kfree(p->local);
+ free_netdev(p->dev);
kfree(p);
return 0;
diff -ur linux-2.6.23-rc9.org/drivers/isdn/i4l/isdn_ppp.c linux-2.6.23-rc9/drivers/isdn/i4l/isdn_ppp.c
--- linux-2.6.23-rc9.org/drivers/isdn/i4l/isdn_ppp.c 2007-10-08 12:01:22.000000000 +0200
+++ linux-2.6.23-rc9/drivers/isdn/i4l/isdn_ppp.c 2007-10-08 17:42:06.000000000 +0200
@@ -360,7 +360,7 @@
* isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1
* removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon()
*/
- isdn_net_hangup(&p->dev);
+ isdn_net_hangup(p->dev);
}
for (i = 0; i < NUM_RCV_BUFFS; i++) {
kfree(is->rq[i].buf);
@@ -531,7 +531,7 @@
if (lp) {
/* OK .. we are ready to send buffers */
is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */
- netif_wake_queue(&lp->netdev->dev);
+ netif_wake_queue(lp->netdev->dev);
break;
}
}
@@ -1023,7 +1023,7 @@
static void
isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff *skb, int proto)
{
- struct net_device *dev = &net_dev->dev;
+ struct net_device *dev = net_dev->dev;
struct ippp_struct *is, *mis;
isdn_net_local *mlp = NULL;
int slot;
diff -ur linux-2.6.23-rc9.org/include/linux/isdn.h linux-2.6.23-rc9/include/linux/isdn.h
--- linux-2.6.23-rc9.org/include/linux/isdn.h 2007-04-26 05:08:32.000000000 +0200
+++ linux-2.6.23-rc9/include/linux/isdn.h 2007-10-08 16:23:43.000000000 +0200
@@ -389,7 +389,7 @@
online */
spinlock_t queue_lock; /* lock to protect queue */
void *next; /* Pointer to next isdn-interface */
- struct net_device dev; /* interface to upper levels */
+ struct net_device *dev; /* interface to upper levels */
#ifdef CONFIG_ISDN_PPP
ippp_bundle * pb; /* pointer to the common bundle structure
* with the per-bundle data */
--
Karsten Keil
SuSE Labs
ISDN and VOIP development
SUSE LINUX Products GmbH, Maxfeldstr.5 90409 Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg)
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