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6f01fd6e6f
linux/net
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Eric Dumazet 6f01fd6e6f af_unix: fix EPOLLET regression for stream sockets 
Commit 0884d7aa24 (AF_UNIX: Fix poll blocking problem when reading from
a stream socket) added a regression for epoll() in Edge Triggered mode
(EPOLLET)

Appropriate fix is to use skb_peek()/skb_unlink() instead of
skb_dequeue(), and only call skb_unlink() when skb is fully consumed.

This remove the need to requeue a partial skb into sk_receive_queue head
and the extra sk->sk_data_ready() calls that added the regression.

This is safe because once skb is given to sk_receive_queue, it is not
modified by a writer, and readers are serialized by u->readlock mutex.

This also reduce number of spinlock acquisition for small reads or
MSG_PEEK users so should improve overall performance.

Reported-by: Nick Mathewson <nickm@freehaven.net>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Alexey Moiseytsev <himeraster@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-01-30 12:45:07 -05:00
..
9p virtio: rename virtqueue_add_buf_gfp to virtqueue_add_buf 2012-01-12 15:44:42 +10:30
802 net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
8021q vlan: static functions 2011-12-14 02:39:30 -05:00
appletalk net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
atm net: Rename dst_get_neighbour{, _raw} to dst_get_neighbour_noref{, _raw}. 2011-12-05 15:20:19 -05:00
ax25 ax25: avoid overflows in ax25_setsockopt() 2011-12-28 14:08:08 -05:00
batman-adv batman-adv: Fix merge error. 2011-12-16 15:07:28 -05:00
bluetooth bluetooth: hci: Fix type of "enable_hs" to bool. 2012-01-22 15:08:46 -05:00
bridge bridge: BH already disabled in br_fdb_cleanup() 2012-01-17 10:17:32 -05:00
caif net caif: Register properly as a pernet subsystem. 2012-01-27 21:06:03 -05:00
can can: remove references to berlios mailinglist 2011-10-17 19:22:46 -04:00
ceph libceph: remove useless return value for osd_client __send_request() 2012-01-10 08:57:03 -08:00
core net: RTNETLINK adjusting values of min_ifinfo_dump_size 2012-01-26 16:35:57 -05:00
dcb net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
dccp inet_diag: Rename inet_diag_req into inet_diag_req_v2 2012-01-11 12:56:06 -08:00
decnet Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security 2012-01-14 18:36:33 -08:00
dns_resolver
dsa dsa: Move switch drivers to new directory drivers/net/dsa 2011-11-29 00:21:36 -05:00
econet net: Remove all uses of LL_ALLOCATED_SPACE 2011-11-18 14:37:09 -05:00
ethernet
ieee802154 net: Remove all uses of LL_ALLOCATED_SPACE 2011-11-18 14:37:09 -05:00
ipv4 tcp: fix tcp_trim_head() to adjust segment count with skb MSS 2012-01-30 12:42:58 -05:00
ipv6 tcp: md5: using remote adress for md5 lookup in rst packet 2012-01-22 15:08:45 -05:00
ipx net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
irda irda: use msecs_to_jiffies() rather than manual calculation 2011-12-21 15:46:22 -05:00
iucv af_iucv: get rid of state IUCV_SEVERED 2011-12-20 14:05:03 -05:00
key net: use IS_ENABLED(CONFIG_IPV6) 2011-12-11 18:25:16 -05:00
l2tp l2tp: l2tp_ip - fix possible oops on packet receive 2012-01-25 21:45:00 -05:00
lapb
llc llc: Fix race condition in llc_ui_recvmsg 2012-01-24 15:33:19 -05:00
mac80211 mac80211: set bss_conf.idle when vif is connected 2012-01-24 14:47:09 -05:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-01-17 22:26:41 -08:00
netlabel net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
netlink Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security 2012-01-14 18:36:33 -08:00
netrom netrom: avoid overflows in nr_setsockopt() 2011-12-28 14:08:08 -05:00
nfc NFC: Export a new attribute nfcid1 in target info 2012-01-04 14:30:43 -05:00
openvswitch openvswitch: Fix multipart datapath dumps. 2012-01-17 23:56:19 -05:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-30 13:04:14 -05:00
phonet net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
rds rds: Make rds_sock_lock BH rather than IRQ safe. 2012-01-24 17:03:44 -05:00
rfkill Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2012-01-05 10:13:24 -05:00
rose net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
rxrpc net: fix assignment of 0/1 to bool variables. 2011-12-19 22:27:29 -05:00
sched netem: Fix off-by-one bug in reordering 2012-01-22 15:08:44 -05:00
sctp Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-01-08 13:21:22 -08:00
sunrpc Merge branch 'for-3.3' of git://linux-nfs.org/~bfields/linux 2012-01-14 12:26:41 -08:00
tipc tipc: rename struct bearer_name to struct tipc_bearer_names 2011-12-29 21:53:30 -05:00
unix af_unix: fix EPOLLET regression for stream sockets 2012-01-30 12:45:07 -05:00
wanrouter wanrouter: Remove kernel_lock annotations 2011-11-07 13:27:30 -05:00
wimax net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
wireless nl80211: fix old station flags compatibility 2012-01-11 15:14:50 -05:00
x25 net:x25: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xfrm Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security 2012-01-14 18:36:33 -08:00
compat.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
Kconfig net: Add Open vSwitch kernel components. 2011-12-03 09:35:17 -08:00
Makefile net: Add Open vSwitch kernel components. 2011-12-03 09:35:17 -08:00
nonet.c
socket.c net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
sysctl_net.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00