diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2018-06-25 09:26:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-22 14:25:53 +0200 |
| commit | 73852461f8edec6dae90a303bec5f2b212828eb7 (patch) | |
| tree | 95afd95eec42bb29703dbe016dc5014f95f89411 /drivers | |
| parent | 6f6d1452ad16bd35a3f44c4ce67b5075e86e9b18 (diff) | |
r8152: napi hangup fix after disconnect
[ Upstream commit 0ee1f4734967af8321ecebaf9c74221ace34f2d5 ]
When unplugging an r8152 adapter while the interface is UP, the NIC
becomes unusable. usb->disconnect (aka rtl8152_disconnect) deletes
napi. Then, rtl8152_disconnect calls unregister_netdev and that invokes
netdev->ndo_stop (aka rtl8152_close). rtl8152_close tries to
napi_disable, but the napi is already deleted by disconnect above. So
the first while loop in napi_disable never finishes. This results in
complete deadlock of the network layer as there is rtnl_mutex held by
unregister_netdev.
So avoid the call to napi_disable in rtl8152_close when the device is
already gone.
The other calls to usb_kill_urb, cancel_delayed_work_sync,
netif_stop_queue etc. seem to be fine. The urb and netdev is not
destroyed yet.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: linux-usb@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/r8152.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 2991d7155540..2bb336cb13ee 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -3139,7 +3139,8 @@ static int rtl8152_close(struct net_device *netdev) #ifdef CONFIG_PM_SLEEP unregister_pm_notifier(&tp->pm_notifier); #endif - napi_disable(&tp->napi); + if (!test_bit(RTL8152_UNPLUG, &tp->flags)) + napi_disable(&tp->napi); clear_bit(WORK_ENABLE, &tp->flags); usb_kill_urb(tp->intr_urb); cancel_delayed_work_sync(&tp->schedule); |