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linux-sg2042/net/rds
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Sowmini Varadhan 80ad0d4a7a rds: rds_cong_queue_updates needs to defer the congestion update transmission 
When the RDS transport is TCP, we cannot inline the call to rds_send_xmit
from rds_cong_queue_update because
(a) we are already holding the sock_lock in the recv path, and
    will deadlock when tcp_setsockopt/tcp_sendmsg try to get the sock
    lock
(b) cong_queue_update does an irqsave on the rds_cong_lock, and this
    will trigger warnings (for a good reason) from functions called
    out of sock_lock.

This patch reverts the change introduced by
2fa57129d ("RDS: Bypass workqueue when queueing cong updates").

The patch has been verified for both RDS/TCP as well as RDS/RDMA
to ensure that there are not regressions for either transport:
 - for verification of  RDS/TCP a client-server unit-test was used,
   with the server blocked in gdb and thus unable to drain its rcvbuf,
   eventually triggering a RDS congestion update.
 - for RDS/RDMA, the standard IB regression tests were used

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2015-02-11 14:35:44 -08:00
..
Kconfig net/rds: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:40:02 -08:00
Makefile Net: rds: Makefile: Remove deprecated items 2010-11-22 08:16:15 -08:00
af_rds.c treewide: fix synchronize_rcu() in comments 2014-08-28 15:01:24 +02:00
bind.c net: replace macros net_random and net_srandom with direct calls to prandom 2014-01-14 15:15:25 -08:00
cong.c rds: rds_cong_queue_updates needs to defer the congestion update transmission 2015-02-11 14:35:44 -08:00
connection.c inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
ib.c rds: prevent dereference of a NULL device 2013-12-27 12:33:58 -05:00
ib.h rds: switch ->inc_copy_to_user() to passing iov_iter 2014-11-24 05:16:43 -05:00
ib_cm.c IB/rds: suppress incompatible protocol when version is known 2012-12-26 15:17:37 -08:00
ib_rdma.c net: Replace get_cpu_var through this_cpu_ptr 2014-08-26 13:45:47 -04:00
ib_recv.c rds: switch ->inc_copy_to_user() to passing iov_iter 2014-11-24 05:16:43 -05:00
ib_ring.c RDS/IW+IB: Set recv ring low water mark to 1/2 full. 2009-04-09 17:21:14 -07:00
ib_send.c net: rds: Remove repeated function names from debug output 2015-02-07 22:41:56 -08:00
ib_stats.c RDS: Move atomic stats from general to ib-specific area 2010-09-08 18:12:20 -07:00
ib_sysctl.c net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
info.c rds: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:28 +08:00
info.h RDS: Info and stats 2009-02-26 23:39:25 -08:00
iw.c rds: prevent dereference of a NULL device in rds_iw_laddr_check 2014-03-31 16:25:52 -04:00
iw.h rds: switch ->inc_copy_to_user() to passing iov_iter 2014-11-24 05:16:43 -05:00
iw_cm.c net: rds: Remove repeated function names from debug output 2015-02-07 22:41:56 -08:00
iw_rdma.c RDS: Remove some unused iWARP code 2012-01-12 20:05:28 -08:00
iw_recv.c rds: switch ->inc_copy_to_user() to passing iov_iter 2014-11-24 05:16:43 -05:00
iw_ring.c RDS/IW+IB: Set recv ring low water mark to 1/2 full. 2009-04-09 17:21:14 -07:00
iw_send.c net: rds: Remove repeated function names from debug output 2015-02-07 22:41:56 -08:00
iw_stats.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
iw_sysctl.c rds: remove the unneed NULL checking 2014-05-09 15:59:45 -04:00
loop.c RDS: use gfp flags from caller in conn_alloc() 2012-03-22 19:29:58 -04:00
loop.h RDS: loopback 2009-02-26 23:39:26 -08:00
message.c rds: Make rds_message_copy_from_user() return 0 on success. 2015-02-07 22:41:56 -08:00
page.c net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
rdma.c rds: avoid calling sock_kfree_s() on allocation failure 2014-10-14 17:00:19 -04:00
rdma_transport.c RDS/RDMA: Replace comma with semicolon 2014-05-30 17:48:58 -07:00
rdma_transport.h rds: make local functions/variables static 2010-10-21 04:26:39 -07:00
rds.h rds: switch rds_message_copy_from_user() to iov_iter 2014-11-24 05:16:43 -05:00
recv.c put iov_iter into msghdr 2014-12-09 16:29:03 -05:00
send.c net: introduce helper macro for_each_cmsghdr 2014-12-10 22:41:55 -05:00
stats.c net/rds: zero last byte for strncpy 2013-03-08 00:35:44 -05:00
sysctl.c net: rds: use correct size for max unacked packets and bytes 2015-02-04 16:07:27 -08:00
tcp.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
tcp.h rds: switch ->inc_copy_to_user() to passing iov_iter 2014-11-24 05:16:43 -05:00
tcp_connect.c net/rds: do proper house keeping if connection fails in rds_tcp_conn_connect 2014-10-03 12:51:59 -07:00
tcp_listen.c rds/tcp_listen: Replace comma with semicolon 2014-05-30 17:48:58 -07:00
tcp_recv.c rds: switch ->inc_copy_to_user() to passing iov_iter 2014-11-24 05:16:43 -05:00
tcp_send.c arch: Mass conversion of smp_mb__*() 2014-04-18 14:20:48 +02:00
tcp_stats.c net: rds: fix const array syntax 2011-07-01 16:16:19 -07:00
threads.c net/rds: call rds_conn_drop instead of open code it at rds_connect_complete 2014-10-03 12:51:59 -07:00
transport.c RDS: have sockets get transport module references 2010-09-08 18:16:47 -07:00