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Jason Andryuk 4c65e94eb4 xen-netfront: Fix hang on device removal 
commit c2d2e6738a upstream.

A toolstack may delete the vif frontend and backend xenstore entries
while xen-netfront is in the removal code path.  In that case, the
checks for xenbus_read_driver_state would return XenbusStateUnknown, and
xennet_remove would hang indefinitely.  This hang prevents system
shutdown.

xennet_remove must be able to handle XenbusStateUnknown, and
netback_changed must also wake up the wake_queue for that state as well.

Fixes: 5b5971df3b ("xen-netfront: remove warning when unloading module")

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Cc: Eduardo Otubo <otubo@redhat.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-24 09:32:06 +02:00
..
appletalk net/appletalk: Fix kernel memory disclosure 2017-12-09 18:42:42 +01:00
arcnet
bonding bonding: process the err returned by dev_set_allmulti properly in bond_enslave 2018-04-13 19:50:26 +02:00
caif net: caif: check return value of alloc_netdev 2015-11-09 11:31:13 -05:00
can can: cc770: Fix use after free in cc770_tx_interrupt() 2018-03-28 18:40:16 +02:00
cris
dsa net: dsa: bcm_sf2: Ensure we re-negotiate EEE during after link change 2016-12-10 19:07:23 +01:00
ethernet r8169: fix setting driver_data after register_netdev 2018-04-13 19:50:27 +02:00
fddi
fjes fjes: Fix wrong netdevice feature flags 2017-12-20 10:04:55 +01:00
hamradio hdlcdrv: Fix divide by zero in hdlcdrv_ioctl 2018-04-13 19:50:14 +02:00
hippi hippi: Fix a Fix a possible sleep-in-atomic bug in rr_close 2018-02-25 11:03:42 +01:00
hyperv hv_netvsc: use skb_get_hash() instead of a homegrown implementation 2017-03-26 12:13:18 +02:00
ieee802154 fakelb: fix schedule while atomic 2017-03-15 09:57:15 +08:00
ipvlan ipvlan: add L2 check for packets arriving via virtual devices 2018-03-22 09:23:30 +01:00
irda irda: vlsi_ir: fix check for DMA mapping errors 2017-12-25 14:22:12 +01:00
phy net: phy: avoid genphy_aneg_done() for PHYs without clause 22 support 2018-04-13 19:50:18 +02:00
plip
ppp pptp: remove a buggy dst release in pptp_connect() 2018-04-13 19:50:25 +02:00
slip slip: Check if rstate is initialized before uncompressing 2018-04-24 09:32:04 +02:00
team team: Fix double free in error path 2018-03-31 18:12:34 +02:00
usb lan78xx: Correctly indicate invalid OTP 2018-04-24 09:32:04 +02:00
vmxnet3 vmxnet3: ensure that adapter is in proper state during force_close 2018-04-13 19:50:04 +02:00
wan wan: pc300too: abort path on failure 2018-03-24 10:58:43 +01:00
wimax net: wimax/i2400m: fix NULL-deref at probe 2017-12-20 10:04:54 +01:00
wireless rtl8187: Fix NULL pointer dereference in priv->conf_mutex 2018-04-24 09:32:04 +02:00
xen-netback xen/netback: set default upper limit of tx/rx queues to 8 2017-11-15 17:13:09 +01:00
dummy.c
eql.c
geneve.c geneve: avoid use-after-free of skb->data 2016-12-10 19:07:24 +01:00
ifb.c
Kconfig vmxnet3: prevent building with 64K pages 2018-02-25 11:03:42 +01:00
LICENSE.SRC
loopback.c net: introduce device min_header_len 2017-02-18 16:39:27 +01:00
macvlan.c macvlan: Only deliver one copy of the frame to the macvlan interface 2017-12-20 10:05:01 +01:00
macvtap.c tun/tap: sanitize TUNSETSNDBUF input 2017-11-18 11:11:05 +01:00
Makefile
mdio.c
mii.c
netconsole.c
nlmon.c
ntb_netdev.c
rionet.c rapidio/rionet: fix deadlock on SMP 2016-04-12 09:08:58 -07:00
sb1000.c
Space.c
sungem_phy.c
tun.c tun: allow positive return values on dev_get_valid_name() call 2017-11-18 11:11:06 +01:00
veth.c veth: set peer GSO values 2018-03-22 09:23:29 +01:00
virtio_net.c virtio_net: check return value of skb_to_sgvec in one more location 2018-04-13 19:50:23 +02:00
vrf.c vrf: Fix use after free and double free in vrf_finish_output 2018-04-13 19:50:27 +02:00
vxlan.c vxlan: dont migrate permanent fdb entries during learn 2018-04-13 19:50:21 +02:00
xen-netfront.c xen-netfront: Fix hang on device removal 2018-04-24 09:32:06 +02:00