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Jakub Kicinski ac5b70198a net: fix race on decreasing number of TX queues 
netif_set_real_num_tx_queues() can be called when netdev is up.
That usually happens when user requests change of number of
channels/rings with ethtool -L.  The procedure for changing
the number of queues involves resetting the qdiscs and setting
dev->num_tx_queues to the new value.  When the new value is
lower than the old one, extra care has to be taken to ensure
ordering of accesses to the number of queues vs qdisc reset.

Currently the queues are reset before new dev->num_tx_queues
is assigned, leaving a window of time where packets can be
enqueued onto the queues going down, leading to a likely
crash in the drivers, since most drivers don't check if TX
skbs are assigned to an active queue.

Fixes: e6484930d7 ("net: allocate tx queues in register_netdevice")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-02-14 14:12:55 -05:00
..
Makefile xdp: base API for new XDP rx-queue info concept 2018-01-05 15:21:20 -08:00
datagram.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
dev.c net: fix race on decreasing number of TX queues 2018-02-14 14:12:55 -05:00
dev_addr_lists.c
…
dev_ioctl.c dev_ioctl(): move copyin/copyout to callers 2018-01-24 19:13:45 -05:00
devlink.c devlink: fix memory leak on 'resource' 2018-01-22 09:27:10 -05:00
drop_monitor.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
dst.c net: Remove dst->next 2017-11-30 09:54:27 -05:00
dst_cache.c net: dst_cache_per_cpu_dst_set() can be static 2016-03-18 17:45:08 -04:00
ethtool.c bitmap: replace bitmap_{from,to}_u32array 2018-02-06 18:32:44 -08:00
fib_notifier.c net: Protect iterations over net::fib_notifier_ops in fib_seq_sum() 2017-11-15 14:01:30 +09:00
fib_rules.c fib_rules: exit_net cleanup check added 2017-11-14 15:45:53 +09:00
filter.c bpf: fix subprog verifier bypass by div/mod by 0 exception 2018-01-26 16:42:05 -08:00
flow_dissector.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-19 22:59:33 -05:00
gen_estimator.c net_sched: gen_estimator: fix lockdep splat 2018-01-29 14:29:10 -05:00
gen_stats.c net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mq 2017-12-08 13:32:26 -05:00
gro_cells.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hwbm.c net: hwbm: Fix unbalanced spinlock in error case 2016-05-25 12:35:09 -07:00
link_watch.c net: link_watch: mark bonding link events urgent 2018-01-23 19:43:30 -05:00
lwt_bpf.c bpf: rename bpf_compute_data_end into bpf_compute_data_pointers 2017-09-26 13:36:44 -07:00
lwtunnel.c ipv6: sr: define core operations for seg6local lightweight tunnel 2017-08-07 14:16:22 -07:00
neighbour.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-17 00:10:42 -05:00
net-procfs.c net: delete /proc THIS_MODULE references 2018-01-16 15:01:33 -05:00
net-sysfs.c net: introduce helper dev_change_tx_queue_len() 2018-01-29 12:42:15 -05:00
net-sysfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
net-traces.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
net_namespace.c net: Move net:netns_ids destruction out of rtnl_lock() and document locking scheme 2018-01-25 11:15:35 -05:00
netclassid_cgroup.c cgroup: add @flags to css_task_iter_start() and implement CSS_TASK_ITER_PROCS 2017-07-21 11:14:51 -04:00
netevent.c
…
netpoll.c netpoll: Use lockdep to assert IRQs are disabled/enabled 2017-11-08 11:13:54 +01:00
netprio_cgroup.c net: remove duplicate includes 2017-12-13 13:18:46 -05:00
pktgen.c pktgen: Clean read user supplied flag mess 2018-01-24 15:03:36 -05:00
ptp_classifier.c ptp: Change ptp_class to a proper bitmask 2015-11-03 11:08:22 -05:00
request_sock.c ipv4: Namespaceify tcp_max_syn_backlog knob 2016-12-29 11:38:31 -05:00
rtnetlink.c rtnetlink: require unique netns identifier 2018-02-08 14:33:20 -05:00
scm.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/user.h> 2017-03-02 08:42:29 +01:00
secure_seq.c tcp: Namespaceify sysctl_tcp_timestamps 2017-06-08 10:53:29 -04:00
skbuff.c net: Whitelist the skbuff_head_cache "cb" field 2018-02-08 15:15:48 -05:00
sock.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
sock_diag.c net: core: fix module type in sock_diag_bind 2018-01-09 11:28:58 -05:00
sock_reuseport.c soreuseport: fix mem leak in reuseport_add_sock() 2018-02-02 19:47:03 -05:00
stream.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
sysctl_net_core.c bpf: restrict access to core bpf sysctls 2018-01-19 18:37:00 -08:00
timestamping.c net: skb_defer_rx_timestamp should check for phydev before setting up classify 2015-07-09 14:17:15 -07:00
tso.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
utils.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-05-02 16:40:27 -07:00
xdp.c xdp/qede: setup xdp_rxq_info and intro xdp_rxq_info_is_reg 2018-01-05 15:21:21 -08:00