Commit 20fbe3ae authored by Oliver Neukum's avatar Oliver Neukum Committed by David S. Miller
Browse files

cdc_subset: deal with a device that needs reset for timeout 



This device needs to be reset to recover from a timeout.
Unfortunately this can be handled only at the level of
the subdrivers.

Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 40eea803

drivers/net/usb/cdc_subset.c

+27 −0
Original line number Diff line number Diff line
@@ -85,9 +85,34 @@ static int always_connected (struct usbnet *dev) 
 *

 *-------------------------------------------------------------------------*/



static void m5632_recover(struct usbnet *dev)

{

	struct usb_device	*udev = dev->udev;

	struct usb_interface	*intf = dev->intf;

	int r;



	r = usb_lock_device_for_reset(udev, intf);

	if (r < 0)

		return;



	usb_reset_device(udev);

	usb_unlock_device(udev);

}



static int dummy_prereset(struct usb_interface *intf)

{

	return 0;

}



static int dummy_postreset(struct usb_interface *intf)

{

	return 0;

}



static const struct driver_info	ali_m5632_info = {

	.description =	"ALi M5632",

	.flags       = FLAG_POINTTOPOINT,

	.recover     = m5632_recover,

};



#endif
@@ -332,6 +357,8 @@ static struct usb_driver cdc_subset_driver = { 
	.probe =	usbnet_probe,

	.suspend =	usbnet_suspend,

	.resume =	usbnet_resume,

	.pre_reset =	dummy_prereset,

	.post_reset =	dummy_postreset,

	.disconnect =	usbnet_disconnect,

	.id_table =	products,

	.disable_hub_initiated_lpm = 1,

drivers/net/usb/usbnet.c

+6 −2
Original line number Diff line number Diff line
@@ -1218,8 +1218,12 @@ void usbnet_tx_timeout (struct net_device *net) 


	unlink_urbs (dev, &dev->txq);

	tasklet_schedule (&dev->bh);



	// FIXME: device recovery -- reset?

	/* this needs to be handled individually because the generic layer

	 * doesn't know what is sufficient and could not restore private

	 * information if a remedy of an unconditional reset were used.

	 */

	if (dev->driver_info->recover)

		(dev->driver_info->recover)(dev);

}

EXPORT_SYMBOL_GPL(usbnet_tx_timeout);

include/linux/usb/usbnet.h

+3 −0
Original line number Diff line number Diff line
@@ -148,6 +148,9 @@ struct driver_info { 
	struct sk_buff	*(*tx_fixup)(struct usbnet *dev,

				struct sk_buff *skb, gfp_t flags);



	/* recover from timeout */

	void	(*recover)(struct usbnet *dev);



	/* early initialization code, can sleep. This is for minidrivers

	 * having 'subminidrivers' that need to do extra initialization

	 * right after minidriver have initialized hardware. */