Commit Graph

145761 Commits

Author SHA1 Message Date
Inaky Perez-Gonzalez 44b849d11b wimax/i2400m: trace commands sent from user space on the "echo" pipe
When commands are sent from user space, trace both the command sent
and the answer received over the "echo" pipe instead of over the
"trace" pipe when command tracing is enabled. As well, when the device
sends a reports/indications, send it over the "echo" pipe.

The "trace" pipe is used by the device to send firmware traces;
gets confusing. Another named pipe makes it easier to split debug
information.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
2009-05-28 18:01:35 -07:00
Inaky Perez-Gonzalez fe44268385 wimax/i2400m: generate fake source MAC address with random_ether_addr()
The WiMAX i2400m driver needs to generate a fake source MAC address to
fake an ethernet header (for destination, the card's MAC is
used). This is the source of the packet, which is the basestation it
came from. The basestation's mac address is not usable for this, as it
uses its own namespace and it is not always available.

Currently the fake source MAC address was being set to all zeros,
which was causing trouble with bridging.

Use random_ether_addr() to generate a proper one that creates no
trouble.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
2009-05-28 18:01:24 -07:00
David S. Miller 7d18f11489 net: Fix arg to trace_napi_poll() in netpoll.
Reproted by Stephen Rothwell.

Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 23:30:09 -07:00
Alexander Duyck e35ec12650 ixgbe: only register DCA requester once
The current driver tries to re-register the DCA requester after reset and
this is not correct.  This change makes it so all we are doing is resetting
the DCA registers after reset and not re-adding the requester.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 17:19:10 -07:00
Alexander Duyck 7e0e99ef43 igb: do not re-register DCA requester on device reset
The current driver is re-registering the DCA requester after every reset.
Instead of doing this we should only be updating the on board DCA registers
and not unregistering/re-registering our requester.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 17:19:09 -07:00
Michał Mirosław 0d63cbb535 wireless: Use genl_register_family_with_ops()
Use genl_register_family_with_ops() instead of a copy.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:25 -07:00
Michał Mirosław 7ae740df3a netlabel: Use genl_register_family_with_ops()
Use genl_register_family_with_ops() instead of a copy. This fixes genetlink
family leak on error path.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:24 -07:00
Michał Mirosław 8f698d5453 ipvs: Use genl_register_family_with_ops()
Use genl_register_family_with_ops() instead of a copy.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:24 -07:00
Michał Mirosław acb0a200ae tipc: Use genl_register_family_with_ops()
Use genl_register_family_with_ops() instead of a copy. This also changes
netlink related variable names to be kernel-wide unique for consistency
with other users.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:23 -07:00
Michał Mirosław 502664eeaf irda: Use genl_register_family_with_ops()
Use genl_register_family_with_ops() instead of a copy.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:22 -07:00
Michał Mirosław a7b11d7382 genetlink: Introduce genl_register_family_with_ops()
This introduces genl_register_family_with_ops() that registers a genetlink
family along with operations from a table. This is used to kill copy'n'paste
occurrences in following patches.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:22 -07:00
Neil Horman 4ea7e38696 dropmon: add ability to detect when hardware dropsrxpackets
Patch to add the ability to detect drops in hardware interfaces via dropwatch.
Adds a tracepoint to net_rx_action to signal everytime a napi instance is
polled.  The dropmon code then periodically checks to see if the rx_frames
counter has changed, and if so, adds a drop notification to the netlink
protocol, using the reserved all-0's vector to indicate the drop location was in
hardware, rather than somewhere in the code.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

 include/linux/net_dropmon.h |    8 ++
 include/trace/napi.h        |   11 +++
 net/core/dev.c              |    5 +
 net/core/drop_monitor.c     |  124 ++++++++++++++++++++++++++++++++++++++++++--
 net/core/net-traces.c       |    4 +
 net/core/netpoll.c          |    2
 6 files changed, 149 insertions(+), 5 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 16:50:21 -07:00
Eric W. Biederman d95ed9275e af_packet: Teach to listen for multiple unicast addresses.
The the PACKET_ADD_MEMBERSHIP and the PACKET_DROP_MEMBERSHIP setsockopt
calls for af_packet already has all of the infrastructure needed to subscribe
to multiple mac addresses.  All that is missing is a flag to say that
the address we want to listen on is a unicast address.

So introduce PACKET_MR_UNICAST and wire it up to dev_unicast_add and
dev_unicast_delete.

Additionally I noticed that errors from dev_mc_add were not propagated
from packet_dev_mc so fix that.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 15:13:39 -07:00
Stephen Hemminger ca0f31125c netns: simplify net_ns_init
The net_ns_init code can be simplified. No need to save error code
if it is only going to panic if it is set 4 lines later.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 15:10:31 -07:00
Stephen Hemminger 1f7a2bb4ef netns: remove leftover debugging message
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-21 15:10:05 -07:00
Divy Le Ray 703cebabd1 cxgb: set phy's mdio dev before the phy init sequence
mdio's dev field needs to be set before mdio ops occur.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 20:51:59 -07:00
Divy Le Ray 86c890ab1b cxgb3: set phy's mdio dev before the phy init sequence
mdio's dev field needs to be set before mdio ops occur.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 20:51:58 -07:00
Ben Hutchings 64318334bf cxgb3: Use generic XENPAK LASI register definitions
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 20:51:58 -07:00
Ben Hutchings aa22437e87 chelsio: Use generic XENPAK LASI register definitions
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 20:51:56 -07:00
Klaus-Dieter Wacket 9f29f6de56 qeth: Clear SBALF15 in any case for output buffers.
Function qeth_clear_output_buffer for HiperSockets may not clear
all 16 SBALEs, but only the used ones. The error flag in SBALF15
has to be cleared in any case.

Signed-off-by: Klaus-Dieter Wacker <kdwacker@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 17:36:51 -07:00
Ursula Braun b91398008c qeth: omit upstream checksumming for HiperSockets
For HiperSocket devices receive-path checksumming is not required.
Thus NO_CHECKSUMMING is used as default for HiperSocket interfaces.
For layer3 devices configured with NO_CHECKSUMMING received skbs
should have set their ip_summed field to CHECKSUM_UNNECESSARY.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 17:36:51 -07:00
Ursula Braun 0666eb06ab qeth: support z/VM VSWITCH Port Isolation
z/VM Virtual Switch Port Isolation allows guests on a VLAN UNAWARE
virtual switch to be isolated from other guests on the VSWITCH.
(See z/VM Apars VM64281 and VM64463).
The Linux qeth driver is affected, because it has to handle new
error codes introduced with the z/VM VSWITCH Port Isolation support.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 17:36:50 -07:00
Ursula Braun 8ac6d45228 ctcm: avoid crash in ctcm_remove_device
Channels are already removed when setting a ctcm-device offline.
Thus ctcm_remove_device must not refer to channel information.
Solution: delete channel information from the trace call in
ctcm_remove_device.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 17:36:49 -07:00
Ursula Braun f214856540 qeth: avoid crash after detach of replugged device
If a qeth device is plugged off, setting the device online stops in
state HARDSETUP and a failure is reported to the base cio-layer
causing halt/clear to be invoked. Replugging the device again triggers
a qeth recovery without notification of the cio-layer. If a device
is ungrouped in this state, the qeth set_offline function is not
invoked, because the corresponding ccwgroup device is not in state
ONLINE. Then incoming traffic is still handled by the qdio layer
resulting in a crash in qeth_l<x>_qdio_input_handler, because (part
of) the qeth data structures for this device are already removed.
Solution: After replugging the device qeth recovery should lead to a
working net device. Thus a "LAN offline" result when setting a qeth
device online must not report a failure to the base cio-layer.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 17:36:49 -07:00
Rami Rosen 04af8cf6f3 net: Remove unused parameter from fill method in fib_rules_ops.
The netlink message header (struct nlmsghdr) is an unused parameter in
fill method of fib_rules_ops struct.  This patch removes this
parameter from this method and fixes the places where this method is
called.

(include/net/fib_rules.h)

Signed-off-by: Rami Rosen <ramirose@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 17:26:23 -07:00
Eric W. Biederman 288ddad5b0 syscall: Sort out syscall_restart name clash.
Stephen Rothwell <sfr@canb.auug.org.au> writes:

> Today's linux-next build of at least some av32 and arm configs failed like this:
>
> arch/avr32/kernel/signal.c:216: error: conflicting types for 'restart_syscall'
> include/linux/sched.h:2184: error: previous definition of 'restart_syscall' was here
>
> Caused by commit 690cc3ffe3 ("syscall:
> Implement a convinience function restart_syscall") from the net tree.

Grrr. Some days it feels like all of the good names are already taken.

Let's just rename the two static users in arm and avr32 to get this
sorted out.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-20 15:52:40 -07:00
Ben Hutchings 97bc54152e sfc: Remove lro module parameter
GRO/LRO can be controlled through ethtool so this is unnecessary.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 16:19:08 -07:00
Sascha Hlusiak 645069299a sit: stateless autoconf for isatap
be sent periodically. The rs_delay can be speficied when adding the
PRL entry and defaults to 15 minutes.

The RS is sent from every link local adress that's assigned to the
tunnel interface. It's directed to the (guessed) linklocal address
of the router and is sent through the tunnel.

Better: send to ff02::2 encapsuled in unicast directed to router-v4.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 16:02:02 -07:00
Sascha Hlusiak 9af28511be addrconf: refuse isatap eui64 for INADDR_ANY
A tunnel with no local ipv4 endpoint would otherwise use the
ISATAP linklocal address fe80::5efe:0:0, which is invalid. Rather not
add a linklocal address at all.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 16:02:02 -07:00
Sascha Hlusiak 4b27960174 sit: ipip6_tunnel_del_prl: return err
Typo. When deleting a PRL entry, return status to userspace
instead of success.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 16:02:01 -07:00
Sascha Hlusiak 4fddbf5d78 sit: strictly restrict incoming traffic to tunnel link device
Check link device when looking up a tunnel. When a tunnel is
linked to a interface, traffic from a different interface must not
reach the tunnel.

This also allows creating of multiple tunnels with the same
endpoints, if the link device differs.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 16:02:00 -07:00
Sascha Hlusiak 8db99e5717 sit: Fail to create tunnel, if it already exists
When locating the tunnel, do not continue if it is found. Otherwise
a different tunnel with similar configuration would be returned and
parts could be overwritten.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 16:02:00 -07:00
Chris Friesen 9643f45512 ipv4: teach ipconfig about the MTU option in DHCP
The DHCP spec allows the server to specify the MTU.  This can be useful
for netbooting with UDP-based NFS-root on a network using jumbo frames.
This patch allows the kernel IP autoconfiguration to handle this option
correctly.

It would be possible to use initramfs and add a script to set the MTU,
but that seems like a complicated solution if no initramfs is otherwise
necessary, and would bloat the kernel image more than this code would.

This patch was originally submitted to LKML in 2003 by Hans-Peter Jansen.

Signed-off-by: Chris Friesen <cfriesen@nortel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:17 -07:00
Pablo Neira Ayuso fd2120ca0d net: use NLMSG_DEFAULT_SIZE in nlmsg_new() allocations
nlmsg_new() adds the size of the netlink header to the value
that has been passed as parameter. If NLMSG_GOODSIZE is selected,
we request an allocation of one memory page plus the size of the
header. Instead, NLMSG_DEFAULT_SIZE should be used since it
already substracts the size of the Netlink header.

I have the impression that the similar naming in both constant
is error prone when using it with nlmsg_new(). This is already
documented in include/net/netlink.h

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:16 -07:00
Brice Goglin e5488ce569 myri10ge: update version to 1.5.0-1.415
Update myri10ge driver version to 1.5.0-1.415.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:16 -07:00
Brice Goglin 3a0c7d2d2b myri10ge: allow LRO to be enabled via ethtool
Allow myri10ge LRO to be enabled/disabled via ethtool
(and by the stack for packet forwarding).

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:15 -07:00
Eric Dumazet ab35cd4b8f sch_teql: Use net_device internal stats
We can slightly reduce size of teqlN structure, not duplicating stats
structure in teql_master but using stats field from net_device.stats
for tx_errors and from netdev_queue for tx_bytes/tx_packets/tx_dropped
values.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:15 -07:00
Jesse Brandeburg 0cefafadbb ixgbe: Cleanup feature setup code to make the code more readable
This is purely a cleanup patch.  This collapses some of the code required
when we configure our Tx and Rx feature sets, and makes the code more
readable and maintainable.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:14 -07:00
Peter P Waskiewicz Jr 537d58a00a ixgbe: Change Direct Attach Twinax cable detection for SFP+ NICs
The SFF specification for Direct Attach cable detection has now been
ratified.  Previously, DA cable detect was looking at the Twinaxial bit in
byte 9 of the SFP+ EEPROM.  The spec now defines active and passive DA
cables in byte 8 of the SFP+ EEPROM.  This patch changes the cable
detection for both 82598 and 82599 SFP+ adapters to conform to the new
spec.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:14 -07:00
Peter P Waskiewicz Jr aa5aec8885 ixgbe: Add semaphore access for PHY initialization for 82599
The SFP+ NIC (device id 0x10fb) needs a semaphore to serialize
PHY access, so our PHY init code must honor that same semaphore.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 15:36:13 -07:00
françois romieu 3577aa1bd7 r8169: allow true forced mode setting
Due to mostly historic reasons, including a lack of reliability
of the link handling (especially with the older 8169), the
current r8169 driver emulates forced mode setting by limiting
the advertised modes.

With this change the driver allows real 10/100 forced mode
settings on the 8169 and 8101/8102.

Original idea by Vincent Steenhoute. The RTL_GIGA_MAC_VER_03
tweak was extracted from Realtek's r8169 v6.010.00 driver.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Tested-by: Jean Delvare <jdelvare@suse.de>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 14:31:28 -07:00
françois romieu 381f05172b r8169: remove useless struct member
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 14:31:27 -07:00
Eric Dumazet 8b2d850db2 ppp: unset IFF_XMIT_DST_RELEASE in ppp_setup()
Jarek pointed pppoe can call back dev_queue_xmit(), and might need
skb->dst, so its safer to unset IFF_XMIT_DST_RELEASE on ppp devices.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-19 14:24:37 -07:00
Eric Dumazet 93f154b594 net: release dst entry in dev_hard_start_xmit()
One point of contention in high network loads is the dst_release() performed
when a transmited skb is freed. This is because NIC tx completion calls
dev_kree_skb() long after original call to dev_queue_xmit(skb).

CPU cache is cold and the atomic op in dst_release() stalls. On SMP, this is
quite visible if one CPU is 100% handling softirqs for a network device,
since dst_clone() is done by other cpus, involving cache line ping pongs.

It seems right place to release dst is in dev_hard_start_xmit(), for most
devices but ones that are virtual, and some exceptions.

David Miller suggested to define a new device flag, set in alloc_netdev_mq()
(so that most devices set it at init time), and carefuly unset in devices
which dont want a NULL skb->dst in their ndo_start_xmit().

List of devices that must clear this flag is :

- loopback device, because it calls netif_rx() and quoting Patrick :
    "ip_route_input() doesn't accept loopback addresses, so loopback packets
     already need to have a dst_entry attached."
- appletalk/ipddp.c : needs skb->dst in its xmit function

- And all devices that call again dev_queue_xmit() from their xmit function
(as some classifiers need skb->dst) : bonding, vlan, macvlan, eql, ifb, hdlc_fr

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:19:19 -07:00
Eric W. Biederman 496a60cdcd net: FIX bonding sysfs rtnl_lock deadlock
Sysfs files for a network device can not unconditionally take the
rtnl_lock as the bonding sysfs files do.  If someone accesses those
sysfs files while the network device is being unregistered with the
rtnl_lock held we will deadlock.

So use trylock and restart_syscall to avoid this problem.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:16:00 -07:00
Eric W. Biederman 26574401fe net: Fix ipoib rtnl_lock sysfs deadlock.
Network device sysfs files that grab the rtnl_lock unconditionally
will deadlock if accessed when the network device is being
unregistered.  So use trylock and syscall_restart to avoid this
deadlock.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:15:59 -07:00
Eric W. Biederman af38f29895 net: Fix bridgeing sysfs handling of rtnl_lock
Holding rtnl_lock when we are unregistering the sysfs files can
deadlock if we unconditionally take rtnl_lock in a sysfs file.  So fix
it with the now familiar patter of: rtnl_trylock and syscall_restart()

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:15:59 -07:00
Eric W. Biederman 9b8adb5ea0 net: Fix devinet_sysctl_forward
sysctls are unregistered with the rntl_lock held making
it unsafe to unconditionally grab the the rtnl_lock.  Instead
we need to call rtnl_trylock and restart the system call
if we can not grab it.  Otherwise we could deadlock at unregistration
time.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:15:58 -07:00
Eric W. Biederman 5007392d85 net: FIX ipv6_forward sysctl restart
Just returning -ERESTARTSYS without a signal pending is not
good that will just leak it to userspace.  We need return
-ERESTARTNOINTR so we always restart and set signal pending
so that we fall of the fast path of syscall return and setup
the system call restart.

So use restart_syscall() which does all of this for us.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:15:58 -07:00
Eric W. Biederman 336ca57c3b net-sysfs: Use rtnl_trylock in sysfs methods.
The earlier patch to fix the deadlock between a network device going
away and writing to sysfs attributes was incomplete.
- It did not set signal_pending so we would leak ERSTARTSYS to user space.
- It used ERESTARTSYS which only restarts if sigaction configures it to.
- It did not cover store and show for ifalias.

So fix all of these up and use the new helper restart_syscall so we get
the details correct on what it takes.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-18 22:15:57 -07:00