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Subject[PATCH] atmrefcount
Hi Linus,

This patch contains the fix for the atmrefcount problem (noted as a
critical problem in Ted's todo list).

Patrick

diff -u -r linux-2.4.0-test11.clean/drivers/atm/ambassador.c linux-2.4.0-test11.atmrefcount/drivers/atm/ambassador.c
--- linux-2.4.0-test11.clean/drivers/atm/ambassador.c Fri Jul 7 06:37:24 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/ambassador.c Wed Nov 29 08:41:21 2000
@@ -1251,15 +1251,10 @@
}
}

- // prevent module unload while sleeping (kmalloc/down)
- // doing this any earlier would complicate more error return paths
- MOD_INC_USE_COUNT;
-
// get space for our vcc stuff
vcc = kmalloc (sizeof(amb_vcc), GFP_KERNEL);
if (!vcc) {
PRINTK (KERN_ERR, "out of memory!");
- MOD_DEC_USE_COUNT;
return -ENOMEM;
}
atm_vcc->dev_data = (void *) vcc;
@@ -1425,7 +1420,6 @@
// say the VPI/VCI is free again
clear_bit(ATM_VF_ADDR,&atm_vcc->flags);

- MOD_DEC_USE_COUNT;
return;
}

@@ -1703,7 +1697,8 @@
close: amb_close,
send: amb_send,
sg_send: amb_sg_send,
- proc_read: amb_proc_read
+ proc_read: amb_proc_read,
+ owner: THIS_MODULE,
};

/********** housekeeping **********/
diff -u -r linux-2.4.0-test11.clean/drivers/atm/atmdev_init.c linux-2.4.0-test11.atmrefcount/drivers/atm/atmdev_init.c
--- linux-2.4.0-test11.clean/drivers/atm/atmdev_init.c Fri Apr 14 18:37:10 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/atmdev_init.c Wed Nov 29 08:41:21 2000
@@ -54,7 +54,7 @@
devs += ia_detect();
#endif
#ifdef CONFIG_ATM_FORE200E
- devs += fore200e_detect();
+ devs += fore200e_detect();
#endif
return devs;
}
diff -u -r linux-2.4.0-test11.clean/drivers/atm/atmtcp.c linux-2.4.0-test11.atmrefcount/drivers/atm/atmtcp.c
--- linux-2.4.0-test11.clean/drivers/atm/atmtcp.c Wed Nov 15 08:36:01 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/atmtcp.c Wed Nov 29 08:41:21 2000
@@ -110,7 +110,7 @@

static void atmtcp_v_dev_close(struct atm_dev *dev)
{
- MOD_DEC_USE_COUNT;
+ /* Nothing.... Isn't this simple :-) -- REW */
}


@@ -298,7 +298,8 @@
close: atmtcp_v_close,
ioctl: atmtcp_v_ioctl,
send: atmtcp_v_send,
- proc_read: atmtcp_v_proc
+ proc_read: atmtcp_v_proc,
+ owner: THIS_MODULE
};


@@ -331,18 +332,13 @@
struct atmtcp_dev_data *dev_data;
struct atm_dev *dev;

- MOD_INC_USE_COUNT;
-
dev_data = kmalloc(sizeof(*dev_data),GFP_KERNEL);
- if (!dev_data) {
- MOD_DEC_USE_COUNT;
+ if (!dev_data)
return -ENOMEM;
- }

dev = atm_dev_register(DEV_LABEL,&atmtcp_v_dev_ops,itf,NULL);
if (!dev) {
kfree(dev_data);
- MOD_DEC_USE_COUNT;
return itf == -1 ? -ENOMEM : -EBUSY;
}
dev->ci_range.vpi_bits = MAX_VPI_BITS;
diff -u -r linux-2.4.0-test11.clean/drivers/atm/fore200e.c linux-2.4.0-test11.atmrefcount/drivers/atm/fore200e.c
--- linux-2.4.0-test11.clean/drivers/atm/fore200e.c Mon Oct 16 21:56:50 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/fore200e.c Wed Nov 29 08:41:21 2000
@@ -1407,8 +1407,6 @@
struct fore200e* fore200e = FORE200E_DEV(vcc->dev);
struct fore200e_vcc* fore200e_vcc;

- MOD_INC_USE_COUNT;
-
/* find a free VPI/VCI */
fore200e_walk_vccs(vcc, &vpi, &vci);

@@ -1416,10 +1414,8 @@
vcc->vci = vci;

/* ressource checking only? */
- if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC) {
- MOD_DEC_USE_COUNT;
+ if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
return 0;
- }

set_bit(ATM_VF_ADDR, &vcc->flags);
vcc->itf = vcc->dev->number;
@@ -1437,7 +1433,6 @@
down(&fore200e->rate_sf);
if (fore200e->available_cell_rate < vcc->qos.txtp.max_pcr) {
up(&fore200e->rate_sf);
- MOD_DEC_USE_COUNT;
return -EAGAIN;
}
/* reserving the pseudo-CBR bandwidth at this point grants us
@@ -1454,7 +1449,6 @@
down(&fore200e->rate_sf);
fore200e->available_cell_rate += vcc->qos.txtp.max_pcr;
up(&fore200e->rate_sf);
- MOD_DEC_USE_COUNT;
return -ENOMEM;
}

@@ -1465,7 +1459,6 @@
down(&fore200e->rate_sf);
fore200e->available_cell_rate += vcc->qos.txtp.max_pcr;
up(&fore200e->rate_sf);
- MOD_DEC_USE_COUNT;
return -EBUSY;
}

@@ -1498,10 +1491,6 @@

fore200e_activate_vcin(fore200e, 0, vcc, 0);

-#ifdef MODULE
- MOD_DEC_USE_COUNT;
-#endif
-
kfree(FORE200E_VCC(vcc));

if ((vcc->qos.txtp.traffic_class == ATM_CBR) && (vcc->qos.txtp.max_pcr > 0)) {
@@ -2599,8 +2588,6 @@

printk(FORE200E "FORE Systems 200E-series driver - version " FORE200E_VERSION "\n");

- MOD_INC_USE_COUNT;
-
/* for each configured bus interface */
for (link = 0, bus = fore200e_bus; bus->model_name; bus++) {

@@ -2626,9 +2613,6 @@
}
}

- if (link <= 0)
- MOD_DEC_USE_COUNT;
-
return link;
}

@@ -2943,21 +2927,15 @@

static const struct atmdev_ops fore200e_ops =
{
- NULL, /* fore200e_dev_close */
- fore200e_open,
- fore200e_close,
- fore200e_ioctl,
- fore200e_getsockopt,
- fore200e_setsockopt,
- fore200e_send,
- NULL, /* fore200e_sg_send, */
- NULL, /* fore200e_send_oam, */
- NULL, /* fore200e_phy_put, */
- NULL, /* fore200e_phy_get, */
- NULL, /* fore200e_feedback, */
- fore200e_change_qos,
- NULL, /* fore200e_free_rx_skb */
- fore200e_proc_read
+ open: fore200e_open,
+ close: fore200e_close,
+ ioctl: fore200e_ioctl,
+ getsockopt: fore200e_getsockopt,
+ setsockopt: fore200e_setsockopt,
+ send: fore200e_send,
+ change_qos: fore200e_change_qos,
+ proc_read: fore200e_proc_read,
+ owner: THIS_MODULE,
};


diff -u -r linux-2.4.0-test11.clean/drivers/atm/horizon.c linux-2.4.0-test11.atmrefcount/drivers/atm/horizon.c
--- linux-2.4.0-test11.clean/drivers/atm/horizon.c Fri Jul 7 06:37:24 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/horizon.c Wed Nov 29 08:41:22 2000
@@ -2491,15 +2491,10 @@
return -EINVAL;
}

- // prevent module unload while sleeping (kmalloc)
- // doing this any earlier would complicate more error return paths
- MOD_INC_USE_COUNT;
-
// get space for our vcc stuff and copy parameters into it
vccp = kmalloc (sizeof(hrz_vcc), GFP_KERNEL);
if (!vccp) {
PRINTK (KERN_ERR, "out of memory!");
- MOD_DEC_USE_COUNT;
return -ENOMEM;
}
*vccp = vcc;
@@ -2531,7 +2526,6 @@
if (error) {
PRINTD (DBG_QOS|DBG_VCC, "insufficient cell rate resources");
kfree (vccp);
- MOD_DEC_USE_COUNT;
return error;
}

@@ -2550,7 +2544,6 @@
error = hrz_open_rx (dev, channel);
if (error) {
kfree (vccp);
- MOD_DEC_USE_COUNT;
return error;
}
// this link allows RX frames through
@@ -2620,7 +2613,6 @@
kfree (vcc);
// say the VPI/VCI is free again
clear_bit(ATM_VF_ADDR,&atm_vcc->flags);
- MOD_DEC_USE_COUNT;
}

#if 0
@@ -2751,7 +2743,8 @@
close: hrz_close,
send: hrz_send,
sg_send: hrz_sg_send,
- proc_read: hrz_proc_read
+ proc_read: hrz_proc_read,
+ owner: THIS_MODULE,
};

static int __init hrz_probe (void) {
diff -u -r linux-2.4.0-test11.clean/drivers/atm/iphase.c linux-2.4.0-test11.atmrefcount/drivers/atm/iphase.c
--- linux-2.4.0-test11.clean/drivers/atm/iphase.c Mon Aug 7 07:20:09 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/iphase.c Wed Nov 29 08:41:22 2000
@@ -3143,7 +3143,8 @@
phy_put: ia_phy_put,
phy_get: ia_phy_get,
change_qos: ia_change_qos,
- proc_read: ia_proc_read
+ proc_read: ia_proc_read,
+ owner: THIS_MODULE,
};


@@ -3219,7 +3220,6 @@
printk(KERN_ERR DEV_LABEL ": no adapter found\n");
return -ENXIO;
}
- // MOD_INC_USE_COUNT;
ia_timer.expires = jiffies + 3*HZ;
add_timer(&ia_timer);

@@ -3235,7 +3235,6 @@
int i, j= 0;

IF_EVENT(printk(">ia cleanup_module\n");)
- // MOD_DEC_USE_COUNT;
if (MOD_IN_USE)
printk("ia: module in use\n");
del_timer(&ia_timer);
diff -u -r linux-2.4.0-test11.clean/drivers/atm/nicstar.c linux-2.4.0-test11.atmrefcount/drivers/atm/nicstar.c
--- linux-2.4.0-test11.clean/drivers/atm/nicstar.c Tue Nov 14 22:16:33 2000
+++ linux-2.4.0-test11.atmrefcount/drivers/atm/nicstar.c Wed Nov 29 08:41:22 2000
@@ -268,7 +268,8 @@
send: ns_send,
phy_put: ns_phy_put,
phy_get: ns_phy_get,
- proc_read: ns_proc_read
+ proc_read: ns_proc_read,
+ owner: THIS_MODULE,
};
static struct timer_list ns_timer;
static char *mac[NS_MAX_CARDS];
@@ -1633,7 +1634,6 @@
}

set_bit(ATM_VF_READY,&vcc->flags);
- MOD_INC_USE_COUNT;
return 0;
}

@@ -1762,7 +1762,6 @@
vcc->dev_data = NULL;
clear_bit(ATM_VF_PARTIAL,&vcc->flags);
clear_bit(ATM_VF_ADDR,&vcc->flags);
- MOD_DEC_USE_COUNT;

#ifdef RX_DEBUG
{
diff -u -r linux-2.4.0-test11.clean/include/linux/atm_tcp.h linux-2.4.0-test11.atmrefcount/include/linux/atm_tcp.h
--- linux-2.4.0-test11.clean/include/linux/atm_tcp.h Wed Feb 9 03:23:13 2000
+++ linux-2.4.0-test11.atmrefcount/include/linux/atm_tcp.h Wed Nov 29 08:55:45 2000
@@ -65,6 +65,7 @@
int (*attach)(struct atm_vcc *vcc,int itf);
int (*create_persistent)(int itf);
int (*remove_persistent)(int itf);
+ struct module *owner;
};

extern struct atm_tcp_ops atm_tcp_ops;
diff -u -r linux-2.4.0-test11.clean/include/linux/atmdev.h linux-2.4.0-test11.atmrefcount/include/linux/atmdev.h
--- linux-2.4.0-test11.clean/include/linux/atmdev.h Sun Nov 19 05:58:55 2000
+++ linux-2.4.0-test11.atmrefcount/include/linux/atmdev.h Wed Nov 29 08:55:45 2000
@@ -375,6 +375,7 @@
void (*free_rx_skb)(struct atm_vcc *vcc, struct sk_buff *skb);
/* @@@ temporary hack */
int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
+ struct module *owner;
};


diff -u -r linux-2.4.0-test11.clean/net/atm/addr.c linux-2.4.0-test11.atmrefcount/net/atm/addr.c
--- linux-2.4.0-test11.clean/net/atm/addr.c Wed Mar 22 08:38:26 2000
+++ linux-2.4.0-test11.atmrefcount/net/atm/addr.c Wed Nov 29 08:41:22 2000
@@ -42,7 +42,7 @@
*/

static DECLARE_MUTEX(local_lock);
-
+extern spinlock_t atm_dev_lock;

static void notify_sigd(struct atm_dev *dev)
{
@@ -58,12 +58,14 @@
struct atm_dev_addr *this;

down(&local_lock);
+ spin_lock (&atm_dev_lock);
while (dev->local) {
this = dev->local;
dev->local = this->next;
kfree(this);
}
up(&local_lock);
+ spin_unlock (&atm_dev_lock);
notify_sigd(dev);
}

diff -u -r linux-2.4.0-test11.clean/net/atm/common.c linux-2.4.0-test11.atmrefcount/net/atm/common.c
--- linux-2.4.0-test11.clean/net/atm/common.c Fri Jul 7 06:37:24 2000
+++ linux-2.4.0-test11.atmrefcount/net/atm/common.c Wed Nov 29 08:41:22 2000
@@ -72,6 +72,7 @@
#define DPRINTK(format,args...)
#endif

+spinlock_t atm_dev_lock = SPIN_LOCK_UNLOCKED;

static struct sk_buff *alloc_tx(struct atm_vcc *vcc,unsigned int size)
{
@@ -139,13 +140,19 @@
vcc->dev->ops->free_rx_skb(vcc,skb);
else kfree_skb(skb);
}
+ spin_lock (&atm_dev_lock);
+ fops_put (vcc->dev->ops);
if (atomic_read(&vcc->rx_inuse))
printk(KERN_WARNING "atm_release_vcc: strange ... "
"rx_inuse == %d after closing\n",
atomic_read(&vcc->rx_inuse));
bind_vcc(vcc,NULL);
- }
+ } else
+ spin_lock (&atm_dev_lock);
+
if (free_sk) free_atm_vcc_sk(sk);
+
+ spin_unlock (&atm_dev_lock);
}


@@ -238,9 +245,11 @@
vcc->qos.txtp.min_pcr,vcc->qos.txtp.max_pcr,vcc->qos.txtp.max_sdu);
DPRINTK(" RX: %d, PCR %d..%d, SDU %d\n",vcc->qos.rxtp.traffic_class,
vcc->qos.rxtp.min_pcr,vcc->qos.rxtp.max_pcr,vcc->qos.rxtp.max_sdu);
+ fops_get (dev->ops);
if (dev->ops->open) {
error = dev->ops->open(vcc,vpi,vci);
if (error) {
+ fops_put (dev->ops);
bind_vcc(vcc,NULL);
return error;
}
@@ -252,10 +261,18 @@
static int atm_do_connect(struct atm_vcc *vcc,int itf,int vpi,int vci)
{
struct atm_dev *dev;
+ int return_val;

+ spin_lock (&atm_dev_lock);
dev = atm_find_dev(itf);
- if (!dev) return -ENODEV;
- return atm_do_connect_dev(vcc,dev,vpi,vci);
+ if (!dev)
+ return_val = -ENODEV;
+ else
+ return_val = atm_do_connect_dev(vcc,dev,vpi,vci);
+
+ spin_unlock (&atm_dev_lock);
+
+ return return_val;
}


@@ -285,8 +302,10 @@
else {
struct atm_dev *dev;

+ spin_lock (&atm_dev_lock);
for (dev = atm_devs; dev; dev = dev->next)
if (!atm_do_connect_dev(vcc,dev,vpi,vci)) break;
+ spin_unlock (&atm_dev_lock);
if (!dev) return -ENODEV;
}
if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
@@ -523,57 +542,86 @@
struct atm_vcc *vcc;
int *tmp_buf;
void *buf;
- int error,len,size,number;
+ int error,len,size,number, ret_val;

+ ret_val = 0;
+ spin_lock (&atm_dev_lock);
vcc = ATM_SD(sock);
switch (cmd) {
case SIOCOUTQ:
if (sock->state != SS_CONNECTED ||
- !test_bit(ATM_VF_READY,&vcc->flags))
- return -EINVAL;
- return put_user(vcc->sk->sndbuf-
+ !test_bit(ATM_VF_READY,&vcc->flags)) {
+ ret_val = -EINVAL;
+ goto done;
+ }
+ ret_val = put_user(vcc->sk->sndbuf-
atomic_read(&vcc->tx_inuse)-ATM_PDU_OVHD,
(int *) arg) ? -EFAULT : 0;
+ goto done;
case SIOCINQ:
{
struct sk_buff *skb;

- if (sock->state != SS_CONNECTED)
- return -EINVAL;
+ if (sock->state != SS_CONNECTED) {
+ ret_val = -EINVAL;
+ goto done;
+ }
skb = skb_peek(&vcc->recvq);
- return put_user(skb ? skb->len : 0,(int *) arg)
+ ret_val = put_user(skb ? skb->len : 0,(int *) arg)
? -EFAULT : 0;
+ goto done;
}
case ATM_GETNAMES:
if (get_user(buf,
- &((struct atm_iobuf *) arg)->buffer))
- return -EFAULT;
+ &((struct atm_iobuf *) arg)->buffer)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
if (get_user(len,
- &((struct atm_iobuf *) arg)->length))
- return -EFAULT;
+ &((struct atm_iobuf *) arg)->length)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
size = 0;
for (dev = atm_devs; dev; dev = dev->next)
size += sizeof(int);
- if (size > len) return -E2BIG;
+ if (size > len) {
+ ret_val = -E2BIG;
+ goto done;
+ }
tmp_buf = kmalloc(size,GFP_KERNEL);
- if (!tmp_buf) return -ENOMEM;
+ if (!tmp_buf) {
+ ret_val = -ENOMEM;
+ goto done;
+ }
for (dev = atm_devs; dev; dev = dev->next)
*tmp_buf++ = dev->number;
- if (copy_to_user(buf,(char *) tmp_buf-size,size))
- return -EFAULT;
- return put_user(size,
+ if (copy_to_user(buf,(char *) tmp_buf-size,size)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
+ ret_val = put_user(size,
&((struct atm_iobuf *) arg)->length) ? -EFAULT : 0;
+ goto done;
case SIOCGSTAMP: /* borrowed from IP */
- if (!vcc->timestamp.tv_sec) return -ENOENT;
+ if (!vcc->timestamp.tv_sec) {
+ ret_val = -ENOENT;
+ goto done;
+ }
vcc->timestamp.tv_sec += vcc->timestamp.tv_usec/1000000;
vcc->timestamp.tv_usec %= 1000000;
- return copy_to_user((void *) arg,&vcc->timestamp,
+ ret_val = copy_to_user((void *) arg,&vcc->timestamp,
sizeof(struct timeval)) ? -EFAULT : 0;
+ goto done;
case ATM_SETSC:
printk(KERN_WARNING "ATM_SETSC is obsolete\n");
- return 0;
+ ret_val = 0;
+ goto done;
case ATMSIGD_CTRL:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
/*
* The user/kernel protocol for exchanging signalling
* info uses kernel pointers as opaque references,
@@ -581,175 +629,308 @@
* on the kernel... so we should make sure that we
* have the same privledges that /proc/kcore needs
*/
- if (!capable(CAP_SYS_RAWIO)) return -EPERM;
+ if (!capable(CAP_SYS_RAWIO)) {
+ ret_val = -EPERM;
+ goto done;
+ }
error = sigd_attach(vcc);
if (!error) sock->state = SS_CONNECTED;
- return error;
+ ret_val = error;
+ goto done;
#ifdef CONFIG_ATM_CLIP
case SIOCMKCLIP:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return clip_create(arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = clip_create(arg);
+ goto done;
case ATMARPD_CTRL:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
error = atm_init_atmarp(vcc);
if (!error) sock->state = SS_CONNECTED;
- return error;
+ ret_val = error;
+ goto done;
case ATMARP_MKIP:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return clip_mkip(vcc,arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = clip_mkip(vcc,arg);
+ goto done;
case ATMARP_SETENTRY:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return clip_setentry(vcc,arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = clip_setentry(vcc,arg);
+ goto done;
case ATMARP_ENCAP:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return clip_encap(vcc,arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = clip_encap(vcc,arg);
+ goto done;
#endif
#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
case ATMLEC_CTRL:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
if (atm_lane_ops.lecd_attach == NULL)
atm_lane_init();
- if (atm_lane_ops.lecd_attach == NULL) /* try again */
- return -ENOSYS;
- error = atm_lane_ops.lecd_attach(vcc, (int)arg);
- if (error >= 0) sock->state = SS_CONNECTED;
- return error;
+ if (atm_lane_ops.lecd_attach == NULL) { /* try again */
+ ret_val = -ENOSYS;
+ goto done;
+ }
+ error = atm_lane_ops.lecd_attach(vcc, (int)arg);
+ if (error >= 0) sock->state = SS_CONNECTED;
+ ret_val = error;
+ goto done;
case ATMLEC_MCAST:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return atm_lane_ops.mcast_attach(vcc, (int)arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = atm_lane_ops.mcast_attach(vcc, (int)arg);
+ goto done;
case ATMLEC_DATA:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return atm_lane_ops.vcc_attach(vcc, (void*)arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = atm_lane_ops.vcc_attach(vcc, (void*)arg);
+ goto done;
#endif
#if defined(CONFIG_ATM_MPOA) || defined(CONFIG_ATM_MPOA_MODULE)
case ATMMPC_CTRL:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- if (atm_mpoa_ops.mpoad_attach == NULL)
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
+ if (atm_mpoa_ops.mpoad_attach == NULL)
atm_mpoa_init();
- if (atm_mpoa_ops.mpoad_attach == NULL) /* try again */
- return -ENOSYS;
- error = atm_mpoa_ops.mpoad_attach(vcc, (int)arg);
- if (error >= 0) sock->state = SS_CONNECTED;
- return error;
+ if (atm_mpoa_ops.mpoad_attach == NULL) { /* try again */
+ ret_val = -ENOSYS;
+ goto done;
+ }
+ error = atm_mpoa_ops.mpoad_attach(vcc, (int)arg);
+ if (error >= 0) sock->state = SS_CONNECTED;
+ ret_val = error;
+ goto done;
case ATMMPC_DATA:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- return atm_mpoa_ops.vcc_attach(vcc, arg);
+ if (!capable(CAP_NET_ADMIN))
+ ret_val = -EPERM;
+ else
+ ret_val = atm_mpoa_ops.vcc_attach(vcc, arg);
+ goto done;
#endif
#if defined(CONFIG_ATM_TCP) || defined(CONFIG_ATM_TCP_MODULE)
case SIOCSIFATMTCP:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- if (!atm_tcp_ops.attach) return -ENOPKG;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
+ if (!atm_tcp_ops.attach) {
+ ret_val = -ENOPKG;
+ goto done;
+ }
+ fops_get (&atm_tcp_ops);
error = atm_tcp_ops.attach(vcc,(int) arg);
if (error >= 0) sock->state = SS_CONNECTED;
- return error;
+ else fops_put (&atm_tcp_ops);
+ ret_val = error;
+ goto done;
case ATMTCP_CREATE:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- if (!atm_tcp_ops.create_persistent) return -ENOPKG;
- return atm_tcp_ops.create_persistent((int) arg);
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
+ if (!atm_tcp_ops.create_persistent) {
+ ret_val = -ENOPKG;
+ goto done;
+ }
+ error = atm_tcp_ops.create_persistent((int) arg);
+ if (error < 0) fops_put (&atm_tcp_ops);
+ ret_val = error;
+ goto done;
case ATMTCP_REMOVE:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- if (!atm_tcp_ops.remove_persistent) return -ENOPKG;
- return atm_tcp_ops.remove_persistent((int) arg);
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
+ if (!atm_tcp_ops.remove_persistent) {
+ ret_val = -ENOPKG;
+ goto done;
+ }
+ error = atm_tcp_ops.remove_persistent((int) arg);
+ fops_put (&atm_tcp_ops);
+ ret_val = error;
+ goto done;
#endif
default:
break;
}
- if (get_user(buf,&((struct atmif_sioc *) arg)->arg)) return -EFAULT;
- if (get_user(len,&((struct atmif_sioc *) arg)->length)) return -EFAULT;
- if (get_user(number,&((struct atmif_sioc *) arg)->number))
- return -EFAULT;
- if (!(dev = atm_find_dev(number))) return -ENODEV;
+ if (get_user(buf,&((struct atmif_sioc *) arg)->arg)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
+ if (get_user(len,&((struct atmif_sioc *) arg)->length)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
+ if (get_user(number,&((struct atmif_sioc *) arg)->number)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
+ if (!(dev = atm_find_dev(number))) {
+ ret_val = -ENODEV;
+ goto done;
+ }
+
size = 0;
switch (cmd) {
case ATM_GETTYPE:
size = strlen(dev->type)+1;
- if (copy_to_user(buf,dev->type,size)) return -EFAULT;
+ if (copy_to_user(buf,dev->type,size)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
break;
case ATM_GETESI:
size = ESI_LEN;
- if (copy_to_user(buf,dev->esi,size)) return -EFAULT;
+ if (copy_to_user(buf,dev->esi,size)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
break;
case ATM_SETESI:
{
int i;

for (i = 0; i < ESI_LEN; i++)
- if (dev->esi[i]) return -EEXIST;
+ if (dev->esi[i]) {
+ ret_val = -EEXIST;
+ goto done;
+ }
}
/* fall through */
case ATM_SETESIF:
{
unsigned char esi[ESI_LEN];

- if (!capable(CAP_NET_ADMIN)) return -EPERM;
- if (copy_from_user(esi,buf,ESI_LEN))
- return -EFAULT;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
+ if (copy_from_user(esi,buf,ESI_LEN)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
memcpy(dev->esi,esi,ESI_LEN);
- return ESI_LEN;
+ ret_val = ESI_LEN;
+ goto done;
}
case ATM_GETSTATZ:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
/* fall through */
case ATM_GETSTAT:
size = sizeof(struct atm_dev_stats);
error = fetch_stats(dev,buf,cmd == ATM_GETSTATZ);
- if (error) return error;
+ if (error) {
+ ret_val = error;
+ goto done;
+ }
break;
case ATM_GETCIRANGE:
size = sizeof(struct atm_cirange);
- if (copy_to_user(buf,&dev->ci_range,size))
- return -EFAULT;
+ if (copy_to_user(buf,&dev->ci_range,size)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
break;
case ATM_GETLINKRATE:
size = sizeof(int);
- if (copy_to_user(buf,&dev->link_rate,size))
- return -EFAULT;
+ if (copy_to_user(buf,&dev->link_rate,size)) {
+ ret_val = -EFAULT;
+ goto done;
+ }
break;
case ATM_RSTADDR:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
reset_addr(dev);
break;
case ATM_ADDADDR:
case ATM_DELADDR:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
{
struct sockaddr_atmsvc addr;

- if (copy_from_user(&addr,buf,sizeof(addr)))
- return -EFAULT;
+ if (copy_from_user(&addr,buf,sizeof(addr))) {
+ ret_val = -EFAULT;
+ goto done;
+ }
if (cmd == ATM_ADDADDR)
- return add_addr(dev,&addr);
- else return del_addr(dev,&addr);
+ ret_val = add_addr(dev,&addr);
+ else
+ ret_val = del_addr(dev,&addr);
+ goto done;
}
case ATM_GETADDR:
size = get_addr(dev,buf,len);
- if (size < 0) return size;
+ if (size < 0)
+ ret_val = size;
+ else
/* may return 0, but later on size == 0 means "don't
write the length" */
- return put_user(size,
- &((struct atmif_sioc *) arg)->length) ? -EFAULT : 0;
+ ret_val = put_user(size,
+ &((struct atmif_sioc *) arg)->length) ? -EFAULT : 0;
+ goto done;
case ATM_SETLOOP:
if (__ATM_LM_XTRMT((int) (long) buf) &&
__ATM_LM_XTLOC((int) (long) buf) >
- __ATM_LM_XTRMT((int) (long) buf))
- return -EINVAL;
+ __ATM_LM_XTRMT((int) (long) buf)) {
+ ret_val = -EINVAL;
+ goto done;
+ }
/* fall through */
case ATM_SETCIRANGE:
case SONET_GETSTATZ:
case SONET_SETDIAG:
case SONET_CLRDIAG:
case SONET_SETFRAMING:
- if (!capable(CAP_NET_ADMIN)) return -EPERM;
+ if (!capable(CAP_NET_ADMIN)) {
+ ret_val = -EPERM;
+ goto done;
+ }
/* fall through */
default:
- if (!dev->ops->ioctl) return -EINVAL;
+ if (!dev->ops->ioctl) {
+ ret_val = -EINVAL;
+ goto done;
+ }
size = dev->ops->ioctl(dev,cmd,buf);
- if (size < 0)
- return size == -ENOIOCTLCMD ? -EINVAL : size;
+ if (size < 0) {
+ ret_val = (size == -ENOIOCTLCMD ? -EINVAL : size);
+ goto done;
+ }
}
- if (!size) return 0;
- return put_user(size,&((struct atmif_sioc *) arg)->length) ?
- -EFAULT : 0;
+
+ if (size)
+ ret_val = put_user(size,&((struct atmif_sioc *) arg)->length) ?
+ -EFAULT : 0;
+
+ done:
+ spin_unlock (&atm_dev_lock);
+ return ret_val;
}


diff -u -r linux-2.4.0-test11.clean/net/atm/resources.c linux-2.4.0-test11.atmrefcount/net/atm/resources.c
--- linux-2.4.0-test11.clean/net/atm/resources.c Wed Mar 22 08:38:26 2000
+++ linux-2.4.0-test11.atmrefcount/net/atm/resources.c Wed Nov 29 08:41:22 2000
@@ -25,6 +25,7 @@
struct atm_dev *atm_devs = NULL;
static struct atm_dev *last_dev = NULL;
struct atm_vcc *nodev_vccs = NULL;
+extern spinlock_t atm_dev_lock;


static struct atm_dev *alloc_atm_dev(const char *type)
@@ -48,11 +49,15 @@

static void free_atm_dev(struct atm_dev *dev)
{
+ spin_lock (&atm_dev_lock);
+
if (dev->prev) dev->prev->next = dev->next;
else atm_devs = dev->next;
if (dev->next) dev->next->prev = dev->prev;
else last_dev = dev->prev;
kfree(dev);
+
+ spin_unlock (&atm_dev_lock);
}


@@ -100,10 +105,12 @@
if (atm_proc_dev_register(dev) < 0) {
printk(KERN_ERR "atm_dev_register: "
"atm_proc_dev_register failed for dev %s\n",type);
+ spin_unlock (&atm_dev_lock);
free_atm_dev(dev);
return NULL;
}
#endif
+ spin_unlock (&atm_dev_lock);
return dev;
}

diff -u -r linux-2.4.0-test11.clean/net/atm/signaling.c linux-2.4.0-test11.atmrefcount/net/atm/signaling.c
--- linux-2.4.0-test11.clean/net/atm/signaling.c Wed Nov 15 08:36:01 2000
+++ linux-2.4.0-test11.atmrefcount/net/atm/signaling.c Wed Nov 29 08:41:22 2000
@@ -33,6 +33,7 @@
struct atm_vcc *sigd = NULL;
static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);

+extern spinlock_t atm_dev_lock;

static void sigd_put_skb(struct sk_buff *skb)
{
@@ -219,7 +220,10 @@
printk(KERN_ERR "sigd_close: closing with requests pending\n");
while ((skb = skb_dequeue(&vcc->recvq))) kfree_skb(skb);
purge_vccs(nodev_vccs);
+
+ spin_lock (&atm_dev_lock);
for (dev = atm_devs; dev; dev = dev->next) purge_vccs(dev->vccs);
+ spin_unlock (&atm_dev_lock);
}



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