Jiri Bohac 8b25535501 ipx: fix locking regression in ipx_sendmsg and ipx_recvmsg ... [ Upstream commit 01462405f0 ] This fixes an old regression introduced by commit b0d0d915 (ipx: remove the BKL). When a recvmsg syscall blocks waiting for new data, no data can be sent on the same socket with sendmsg because ipx_recvmsg() sleeps with the socket locked. This breaks mars-nwe (NetWare emulator): - the ncpserv process reads the request using recvmsg - ncpserv forks and spawns nwconn - ncpserv calls a (blocking) recvmsg and waits for new requests - nwconn deadlocks in sendmsg on the same socket Commit b0d0d915 has simply replaced BKL locking with lock_sock/release_sock. Unlike now, BKL got unlocked while sleeping, so a blocking recvmsg did not block a concurrent sendmsg. Only keep the socket locked while actually working with the socket data and release it prior to calling skb_recv_datagram(). Signed-off-by: Jiri Bohac <jbohac@suse.cz> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-12-06 15:55:34 -08:00
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Kconfig	ipx: remove the BKL	2011-03-05 10:55:58 +01:00
Makefile	ipx: move peII functions	2012-07-19 10:48:00 -07:00
af_ipx.c	ipx: fix locking regression in ipx_sendmsg and ipx_recvmsg	2014-12-06 15:55:34 -08:00
ipx_proc.c	net: proc_fs: trivial: print UIDs as unsigned int	2013-08-15 14:37:46 -07:00
ipx_route.c	net: Move prototype declaration to include/net/ipx.h from net/ipx/ipx_route.c	2014-02-09 17:32:49 -08:00
pe2.c	ipx: move peII functions	2012-07-19 10:48:00 -07:00
sysctl_net_ipx.c	net: Convert all sysctl registrations to register_net_sysctl	2012-04-20 21:22:30 -04:00