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Commit 0e42a627 authored by Duncan Sands's avatar Duncan Sands Committed by Greg Kroah-Hartman
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[PATCH] USBATM: shutdown open connections when disconnected 



This patch causes vcc_release_async to be applied to any open
vcc's when the modem is disconnected.  This signals a socket
shutdown, letting the socket user know that the game is up.
I wrote this patch because of reports that pppd would keep
connections open forever when the modem is disconnected.
This patch does not fix that problem, but it's a step in the
right direction.  It doesn't help because the pppoatm module
doesn't yet monitor state changes on the ATM socket, so simply
never realises that the ATM connection has gone down (meaning
it doesn't tell the ppp layer).  But at least there is a socket
state change now.  Unfortunately this patch may create problems
for those rare users like me who use routed IP or some other
non-ppp connection method that goes via the ATM ARP daemon: the
daemon is buggy, and with this patch will crash when the modem
is disconnected.  Users with a buggy atmarpd can simply restart
it after disconnecting the modem.

Signed-off-by: default avatarDuncan Sands <baldrick@free.fr>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 233c08e0

drivers/usb/atm/usbatm.c

+47 −19
Original line number Diff line number Diff line
@@ -602,8 +602,12 @@ static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 


	vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);



	if (!instance) {

		dbg("%s: NULL data!", __func__);

	/* racy disconnection check - fine */

	if (!instance || instance->disconnected) {

#ifdef DEBUG

		if (printk_ratelimit())

			printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");

#endif

		err = -ENODEV;

		goto fail;

	}
@@ -715,7 +719,10 @@ static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *pag 
			       atomic_read(&atm_dev->stats.aal5.rx_err),

			       atomic_read(&atm_dev->stats.aal5.rx_drop));



	if (!left--)

	if (!left--) {

		if (instance->disconnected)

			return sprintf(page, "Disconnected\n");

		else

			switch (atm_dev->signal) {

			case ATM_PHY_SIG_FOUND:

				return sprintf(page, "Line up\n");
@@ -724,6 +731,7 @@ static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *pag 
			default:

				return sprintf(page, "Line state unknown\n");

			}

	}



	return 0;

}
@@ -757,6 +765,12 @@ static int usbatm_atm_open(struct atm_vcc *vcc) 


	down(&instance->serialize);	/* vs self, usbatm_atm_close, usbatm_usb_disconnect */



	if (instance->disconnected) {

		atm_dbg(instance, "%s: disconnected!\n", __func__);

		ret = -ENODEV;

		goto fail;

	}



	if (usbatm_find_vcc(instance, vpi, vci)) {

		atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);

		ret = -EADDRINUSE;
@@ -845,6 +859,13 @@ static void usbatm_atm_close(struct atm_vcc *vcc) 
static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,

			  void __user * arg)

{

	struct usbatm_data *instance = atm_dev->dev_data;



	if (!instance || instance->disconnected) {

		dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");

		return -ENODEV;

	}



	switch (cmd) {

	case ATM_QUERYLOOP:

		return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
@@ -1129,6 +1150,7 @@ void usbatm_usb_disconnect(struct usb_interface *intf) 
{

	struct device *dev = &intf->dev;

	struct usbatm_data *instance = usb_get_intfdata(intf);

	struct usbatm_vcc_data *vcc_data;

	int i;



	dev_dbg(dev, "%s entered\n", __func__);
@@ -1141,12 +1163,18 @@ void usbatm_usb_disconnect(struct usb_interface *intf) 
	usb_set_intfdata(intf, NULL);



	down(&instance->serialize);

	instance->disconnected = 1;

	if (instance->thread_pid >= 0)

		kill_proc(instance->thread_pid, SIGTERM, 1);

	up(&instance->serialize);



	wait_for_completion(&instance->thread_exited);



	down(&instance->serialize);

	list_for_each_entry(vcc_data, &instance->vcc_list, list)

		vcc_release_async(vcc_data->vcc, -EPIPE);

	up(&instance->serialize);



	tasklet_disable(&instance->rx_channel.tasklet);

	tasklet_disable(&instance->tx_channel.tasklet);
@@ -1156,6 +1184,14 @@ void usbatm_usb_disconnect(struct usb_interface *intf) 
	del_timer_sync(&instance->rx_channel.delay);

	del_timer_sync(&instance->tx_channel.delay);



	/* turn usbatm_[rt]x_process into something close to a no-op */

	/* no need to take the spinlock */

	INIT_LIST_HEAD(&instance->rx_channel.list);

	INIT_LIST_HEAD(&instance->tx_channel.list);



	tasklet_enable(&instance->rx_channel.tasklet);

	tasklet_enable(&instance->tx_channel.tasklet);



	if (instance->atm_dev && instance->driver->atm_stop)

		instance->driver->atm_stop(instance, instance->atm_dev);
@@ -1164,14 +1200,6 @@ void usbatm_usb_disconnect(struct usb_interface *intf) 


	instance->driver_data = NULL;



	/* turn usbatm_[rt]x_process into noop */

	/* no need to take the spinlock */

	INIT_LIST_HEAD(&instance->rx_channel.list);

	INIT_LIST_HEAD(&instance->tx_channel.list);



	tasklet_enable(&instance->rx_channel.tasklet);

	tasklet_enable(&instance->tx_channel.tasklet);



	for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {

		kfree(instance->urbs[i]->transfer_buffer);

		usb_free_urb(instance->urbs[i]);

drivers/usb/atm/usbatm.h

+1 −0
Original line number Diff line number Diff line
@@ -168,6 +168,7 @@ struct usbatm_data { 


	struct kref refcount;

	struct semaphore serialize;

	int disconnected;



	/* heavy init */

	int thread_pid;