5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Oliver Neukum <oneukum@xxxxxxxx>
commit 04e906839a053f092ef53f4fb2d610983412b904 upstream.
The work can submit URBs and the URBs can schedule the work.
This cycle needs to be broken, when a device is to be stopped.
Use a flag to do so.
This is a design issue as old as the driver.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
CC: stable@xxxxxxxxxxxxxxx
Link: https://patch.msgid.link/20240919123525.688065-1-oneukum@xxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/usb/usbnet.c | 37 ++++++++++++++++++++++++++++---------
include/linux/usb/usbnet.h | 15 +++++++++++++++
2 files changed, 43 insertions(+), 9 deletions(-)
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -467,10 +467,15 @@ static enum skb_state defer_bh(struct us
void usbnet_defer_kevent (struct usbnet *dev, int work)
{
set_bit (work, &dev->flags);
- if (!schedule_work (&dev->kevent))
- netdev_dbg(dev->net, "kevent %s may have been dropped\n", usbnet_event_names[work]);
- else
- netdev_dbg(dev->net, "kevent %s scheduled\n", usbnet_event_names[work]);
+ if (!usbnet_going_away(dev)) {
+ if (!schedule_work(&dev->kevent))
+ netdev_dbg(dev->net,
+ "kevent %s may have been dropped\n",
+ usbnet_event_names[work]);
+ else
+ netdev_dbg(dev->net,
+ "kevent %s scheduled\n", usbnet_event_names[work]);
+ }
}
EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
@@ -538,7 +543,8 @@ static int rx_submit (struct usbnet *dev
tasklet_schedule (&dev->bh);
break;
case 0:
- __usbnet_queue_skb(&dev->rxq, skb, rx_start);
+ if (!usbnet_going_away(dev))
+ __usbnet_queue_skb(&dev->rxq, skb, rx_start);
}
} else {
netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
@@ -848,9 +854,18 @@ int usbnet_stop (struct net_device *net)
/* deferred work (timer, softirq, task) must also stop */
dev->flags = 0;
- del_timer_sync (&dev->delay);
- tasklet_kill (&dev->bh);
+ del_timer_sync(&dev->delay);
+ tasklet_kill(&dev->bh);
cancel_work_sync(&dev->kevent);
+
+ /* We have cyclic dependencies. Those calls are needed
+ * to break a cycle. We cannot fall into the gaps because
+ * we have a flag
+ */
+ tasklet_kill(&dev->bh);
+ del_timer_sync(&dev->delay);
+ cancel_work_sync(&dev->kevent);
+
if (!pm)
usb_autopm_put_interface(dev->intf);
@@ -1176,7 +1191,8 @@ fail_halt:
status);
} else {
clear_bit (EVENT_RX_HALT, &dev->flags);
- tasklet_schedule (&dev->bh);
+ if (!usbnet_going_away(dev))
+ tasklet_schedule(&dev->bh);
}
}
@@ -1201,7 +1217,8 @@ fail_halt:
usb_autopm_put_interface(dev->intf);
fail_lowmem:
if (resched)
- tasklet_schedule (&dev->bh);
+ if (!usbnet_going_away(dev))
+ tasklet_schedule(&dev->bh);
}
}
@@ -1557,6 +1574,7 @@ static void usbnet_bh (struct timer_list
} else if (netif_running (dev->net) &&
netif_device_present (dev->net) &&
netif_carrier_ok(dev->net) &&
+ !usbnet_going_away(dev) &&
!timer_pending(&dev->delay) &&
!test_bit(EVENT_RX_PAUSED, &dev->flags) &&
!test_bit(EVENT_RX_HALT, &dev->flags)) {
@@ -1604,6 +1622,7 @@ void usbnet_disconnect (struct usb_inter
usb_set_intfdata(intf, NULL);
if (!dev)
return;
+ usbnet_mark_going_away(dev);
xdev = interface_to_usbdev (intf);
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -84,8 +84,23 @@ struct usbnet {
# define EVENT_LINK_CHANGE 11
# define EVENT_SET_RX_MODE 12
# define EVENT_NO_IP_ALIGN 13
+/* This one is special, as it indicates that the device is going away
+ * there are cyclic dependencies between tasklet, timer and bh
+ * that must be broken
+ */
+# define EVENT_UNPLUG 31
};
+static inline bool usbnet_going_away(struct usbnet *ubn)
+{
+ return test_bit(EVENT_UNPLUG, &ubn->flags);
+}
+
+static inline void usbnet_mark_going_away(struct usbnet *ubn)
+{
+ set_bit(EVENT_UNPLUG, &ubn->flags);
+}
+
static inline struct usb_driver *driver_of(struct usb_interface *intf)
{
return to_usb_driver(intf->dev.driver);
