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Bjorn Helgaas 543e3a8da5 netpoll: Fix extra refcount release in netpoll_cleanup() 
netpoll_setup() does a dev_hold() on np->dev, the netpoll device.  If it
fails, it correctly does a dev_put() but leaves np->dev set.  If we call
netpoll_cleanup() after the failure, np->dev is still set so we do another
dev_put(), which decrements the refcount an extra time.

It's questionable to call netpoll_cleanup() after netpoll_setup() fails,
but it can be difficult to find the problem, and we can easily avoid it in
this case.  The extra decrements can lead to hangs like this:

  unregister_netdevice: waiting for bond0 to become free. Usage count = -3

Set and clear np->dev at the points where we dev_hold() and dev_put() the
device.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2016-03-25 11:23:14 -04:00
..
6lowpan 6lowpan: iphc: fix SAM/DAM bit comment 2016-03-10 19:51:29 +01:00
9p net/9p: convert to new CQ API 2016-03-10 20:54:09 -05:00
802
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8021q vlan: propagate gso_max_segs 2016-03-17 21:05:01 -04:00
appletalk appletalk: fix erroneous return value 2016-02-18 14:59:34 -05:00
atm net: Generalise wq_has_sleeper helper 2015-11-30 14:47:33 -05:00
ax25 ax25: add link layer header validation function 2016-03-09 22:13:01 -05:00
batman-adv batman-adv: clarify CFG80211 dependency 2016-03-02 13:45:47 -05:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
bridge bridge: update max_gso_segs and max_gso_size 2016-03-21 13:35:56 -04:00
caif net: caif: fix misleading indentation 2016-03-14 13:09:50 -04:00
can can: avoid using timeval for uapi 2015-10-13 17:42:34 +02:00
ceph Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-20 19:08:56 -07:00
core netpoll: Fix extra refcount release in netpoll_cleanup() 2016-03-25 11:23:14 -04:00
dcb net/dcb: make dcbnl.c explicitly non-modular 2015-10-09 07:52:27 -07:00
dccp tcp/dccp: remove obsolete WARN_ON() in icmp handlers 2016-03-17 21:06:40 -04:00
decnet net: add validation for the socket syscall protocol argument 2015-12-14 16:09:30 -05:00
dns_resolver net: dns_resolver: convert time_t to time64_t 2015-11-18 16:27:46 -05:00
dsa net: dsa: refine netdev event notifier 2016-03-14 16:05:32 -04:00
ethernet eth: Pull header from first fragment via eth_get_headlen 2016-02-24 13:58:05 -05:00
hsr net/hsr: fix a warning message 2015-11-23 14:56:15 -05:00
ieee802154 ieee802154: 6lowpan: fix return of netdev notifier 2016-02-23 20:29:40 +01:00
ipv4 net: Reset encap_level to avoid resetting features on inner IP headers 2016-03-23 14:19:08 -04:00
ipv6 net: ping: make ping_v6_sendmsg static 2016-03-23 22:09:58 -04:00
ipx
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irda Merge 4.5-rc4 into tty-next 2016-02-14 14:36:04 -08:00
iucv af_iucv: Validate socket address length in iucv_sock_bind() 2016-01-19 14:21:08 -05:00
kcm kcm: Add receive message timeout 2016-03-09 16:36:15 -05:00
key af_key: fix two typos 2015-10-23 03:05:19 -07:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
l3mdev net: l3mdev: address selection should only consider devices in L3 domain 2016-02-26 14:22:26 -05:00
lapb
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llc af_llc: fix types on llc_ui_wait_for_conn 2016-02-17 16:12:13 -05:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
mpls mpls: autoload lwt module 2016-02-21 22:00:28 -05:00
netfilter netfilter: nf_conntrack: consolidate lock/unlock into unlock_wait 2016-03-15 01:10:42 +01:00
netlabel netlabel: do not initialise statics to NULL 2016-03-07 11:08:26 -05:00
netlink netlink: add support for NIC driver ioctls 2016-03-22 15:45:44 -04:00
netrom
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nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
packet packet: validate variable length ll headers 2016-03-09 22:13:01 -05:00
phonet sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
rfkill Here's another round of updates for -next: 2016-03-01 17:03:27 -05:00
rose
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rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
sched cls_bpf: reset class and reuse major in da 2016-03-18 19:35:21 -04:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-23 23:25:14 -07:00
sunrpc Various bugfixes, a RDMA update from Chuck Lever, and support for a new 2016-03-24 10:41:00 -07:00
switchdev switchdev: fix typo in comments/doc 2016-03-24 14:51:24 -04:00
tipc tipc: make sure IPv6 header fits in skb headroom 2016-03-14 12:23:12 -04:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
vmw_vsock AF_VSOCK: Shrink the area influenced by prepare_to_wait 2016-03-22 16:18:41 -04:00
wimax
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wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
x25
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xfrm xfrm: Fix crash observed during device unregistration and decryption 2016-03-24 14:29:36 -04:00
Kconfig Make DST_CACHE a silent config option 2016-03-21 22:56:38 -04:00
Makefile kcm: Kernel Connection Multiplexor module 2016-03-09 16:36:14 -05:00
compat.c
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socket.c net: Fix use after free in the recvmmsg exit path 2016-03-14 12:41:49 -04:00
sysctl_net.c net: sysctl: fix a kmemleak warning 2015-10-23 06:22:08 -07:00