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path: root/drivers/net/slip.c
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Diffstat (limited to 'drivers/net/slip.c')
-rw-r--r--drivers/net/slip.c96
1 files changed, 23 insertions, 73 deletions
diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index 26f6ee93a064..e17c535a577e 100644
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -616,6 +616,14 @@ static void sl_uninit(struct net_device *dev)
sl_free_bufs(sl);
}
+/* Hook the destructor so we can free slip devices at the right point in time */
+static void sl_free_netdev(struct net_device *dev)
+{
+ int i = dev->base_addr;
+ free_netdev(dev);
+ slip_devs[i] = NULL;
+}
+
static const struct net_device_ops sl_netdev_ops = {
.ndo_init = sl_init,
.ndo_uninit = sl_uninit,
@@ -634,7 +642,7 @@ static const struct net_device_ops sl_netdev_ops = {
static void sl_setup(struct net_device *dev)
{
dev->netdev_ops = &sl_netdev_ops;
- dev->destructor = free_netdev;
+ dev->destructor = sl_free_netdev;
dev->hard_header_len = 0;
dev->addr_len = 0;
@@ -712,8 +720,6 @@ static void sl_sync(void)
static struct slip *sl_alloc(dev_t line)
{
int i;
- int sel = -1;
- int score = -1;
struct net_device *dev = NULL;
struct slip *sl;
@@ -724,55 +730,7 @@ static struct slip *sl_alloc(dev_t line)
dev = slip_devs[i];
if (dev == NULL)
break;
-
- sl = netdev_priv(dev);
- if (sl->leased) {
- if (sl->line != line)
- continue;
- if (sl->tty)
- return NULL;
-
- /* Clear ESCAPE & ERROR flags */
- sl->flags &= (1 << SLF_INUSE);
- return sl;
- }
-
- if (sl->tty)
- continue;
-
- if (current->pid == sl->pid) {
- if (sl->line == line && score < 3) {
- sel = i;
- score = 3;
- continue;
- }
- if (score < 2) {
- sel = i;
- score = 2;
- }
- continue;
- }
- if (sl->line == line && score < 1) {
- sel = i;
- score = 1;
- continue;
- }
- if (score < 0) {
- sel = i;
- score = 0;
- }
- }
-
- if (sel >= 0) {
- i = sel;
- dev = slip_devs[i];
- if (score > 1) {
- sl = netdev_priv(dev);
- sl->flags &= (1 << SLF_INUSE);
- return sl;
- }
}
-
/* Sorry, too many, all slots in use */
if (i >= slip_maxdev)
return NULL;
@@ -909,30 +867,13 @@ err_exit:
}
/*
-
- FIXME: 1,2 are fixed 3 was never true anyway.
-
- Let me to blame a bit.
- 1. TTY module calls this funstion on soft interrupt.
- 2. TTY module calls this function WITH MASKED INTERRUPTS!
- 3. TTY module does not notify us about line discipline
- shutdown,
-
- Seems, now it is clean. The solution is to consider netdevice and
- line discipline sides as two independent threads.
-
- By-product (not desired): sl? does not feel hangups and remains open.
- It is supposed, that user level program (dip, diald, slattach...)
- will catch SIGHUP and make the rest of work.
-
- I see no way to make more with current tty code. --ANK
- */
-
-/*
* Close down a SLIP channel.
* This means flushing out any pending queues, and then returning. This
* call is serialized against other ldisc functions.
+ *
+ * We also use this method fo a hangup event
*/
+
static void slip_close(struct tty_struct *tty)
{
struct slip *sl = tty->disc_data;
@@ -951,10 +892,16 @@ static void slip_close(struct tty_struct *tty)
del_timer_sync(&sl->keepalive_timer);
del_timer_sync(&sl->outfill_timer);
#endif
-
- /* Count references from TTY module */
+ /* Flush network side */
+ unregister_netdev(sl->dev);
+ /* This will complete via sl_free_netdev */
}
+static int slip_hangup(struct tty_struct *tty)
+{
+ slip_close(tty);
+ return 0;
+}
/************************************************************************
* STANDARD SLIP ENCAPSULATION *
************************************************************************/
@@ -1311,6 +1258,7 @@ static struct tty_ldisc_ops sl_ldisc = {
.name = "slip",
.open = slip_open,
.close = slip_close,
+ .hangup = slip_hangup,
.ioctl = slip_ioctl,
.receive_buf = slip_receive_buf,
.write_wakeup = slip_write_wakeup,
@@ -1384,6 +1332,8 @@ static void __exit slip_exit(void)
}
} while (busy && time_before(jiffies, timeout));
+ /* FIXME: hangup is async so we should wait when doing this second
+ phase */
for (i = 0; i < slip_maxdev; i++) {
dev = slip_devs[i];