Commit Graph

348064 Commits

Author SHA1 Message Date
Ariel Elior
b56e9670ff bnx2x: Prepare device and initialize VF database
At nic load of the PF, if VFs may be present, prepare the device
for the VFs. Initialize the VF database in preparation of VF arrival.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:06 -08:00
Ariel Elior
290ca2bb45 bnx2x: Allocate VF database in PF when VFs are present
When A PF determines that it may have to manage SRIOV VFs it
allocates a database for this purpose. The database is intended to
keep track of the VF state, the resources allocated for each VF
(queues, interrupt vectors, etc), the state of the VF's queues.
When the VF loads the database is updated accordingly.
When A VF closes the database is consulted to determine which
resources need to be released (close queues against device, reclaim
interrupt vectors, etc).

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:06 -08:00
Ariel Elior
dc1ba59146 bnx2x: VF fastpath
When VF driver is transmitting it must supply the correct mac
address in the parsing BD. This is used for firmware validation
and enforcement and also for tx-switching.
Refactor interrupt ack flow to allow for different BAR addresses of
the hardware in the PF BAR vs the VF BAR.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:06 -08:00
Ariel Elior
381ac16b10 bnx2x: Support ndo_set_rxmode in VF driver
The VF driver uses the 'q_filter' request in the VF <-> PF channel to
have the PF configure the requested rxmode to device. ndo_set_rxmode
is called under bottom half lock, so sleeping until the response
arrives over the VF <-> PF channel is out of the question. For this reason
the VF driver returns from the ndo after scheduling a work item, which
in turn processes the rx mode request and adds the classification
information through the VF <-> PF channel accordingly.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:05 -08:00
Ariel Elior
9b176b6b63 bnx2x: Add teardown_q and close to VF <-> PF channel
When a VF is being closed its queues are released via
the 'teardown_q' and the VF itself is closed with
'close'. These are essentially the unload counterparts of
'init' and 'setup_q' from the load flow.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:05 -08:00
Ariel Elior
8d9ac297d1 bnx2x: Add init, setup_q, set_mac to VF <-> PF channel
'init' - init an acquired VF. Supply allocation GPAs to PF.
'setup_q' - PF to allocate a queue in device on behalf of the VF.
'set_mac' - PF to configure a mac in device on behalf of the VF.
VF driver uses these requests in the VF <-> PF channel in nic_load
flow.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:05 -08:00
Ariel Elior
ad5afc8936 bnx2x: Separate VF and PF logic
Generally, the VF driver cannot access the chip, except by the
narrow window its BAR allows. Care had to be taken so the VF driver
will not reach code which accesses the chip elsewhere.
Refactor the nic_load flow into parts so it would be
easier to separate the VF-only logic from the PF-only logic.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:05 -08:00
Ariel Elior
4513f92576 bnx2x: Add to VF <-> PF channel the release request
VF driver uses this request when removed. The PF driver
reclaims all resources allocated for that VF at this
time.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:05 -08:00
Ariel Elior
be1f1ffaf9 bnx2x: VF <-> PF channel 'acquire' at vf probe
Add the 'acquire' request to VF <-> PF channel and use it at
VF probe. In the acquire request the VF driver lists the resources
it would like to have. In the response the PF either ratifies the
request, or denies it and supplies the maximum values supported.
The VF may then attempt another acquire request.
This patch adds the bnx2x_vfpf.c file which contains the
implementation of the VF to PF hardware channel.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:05 -08:00
Ariel Elior
1ab4434c64 bnx2x: Support probing and removing of VF device
To support probing and removing of a bnx2x virtual function
the following were added:
1. add bnx2x_vfpf.h: defines the VF to PF channel
2. add bnx2x_sriov.h: header for bnx2x SR-IOV functionality
3. enumerate VF hw types (identify VFs)
4. if driving a VF, map VF bar
5. if driving a VF, allocate Vf to PF channel
6. refactor interrupt flows to include VF

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-02 01:45:04 -08:00
Flavio Leitner
7f51c58731 team: add ethtool support
This patch adds few ethtool operations to team driver.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-30 02:32:09 -08:00
Eric Dumazet
8093315a91 veth: extend device features
veth is lacking most modern facilities, like SG, checksums, TSO.

It makes sense to extend dev->features to get them, or GRO aggregation
is defeated by a forced segmentation.

Reported-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-30 02:31:59 -08:00
Eric Dumazet
2681128f0c veth: reduce stat overhead
veth stats are a bit bloated. There is no need to account transmit
and receive stats, since they are absolutely symmetric.

Also use a per device atomic64_t for the dropped counter, as it
should never be used in fast path.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-30 02:31:58 -08:00
Flavio Leitner
4cafe373d4 team: implement carrier change
The user space teamd daemon may need to control the
master's carrier state depending on the selected mode.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-30 02:31:58 -08:00
stephen hemminger
576eb62598 bridge: respect RFC2863 operational state
The bridge link detection should follow the operational state
of the lower device, rather than the carrier bit. This allows devices
like tunnels that are controlled by userspace control plane to work
with bridge STP link management.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Reviewed-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-30 02:31:43 -08:00
Daniel Borkmann
aa1113d9f8 net: filter: return -EINVAL if BPF_S_ANC* operation is not supported
Currently, we return -EINVAL for malformed or wrong BPF filters.
However, this is not done for BPF_S_ANC* operations, which makes it
more difficult to detect if it's actually supported or not by the
BPF machine. Therefore, we should also return -EINVAL if K is within
the SKF_AD_OFF universe and the ancillary operation did not match.

Why exactly is it needed? If tools such as libpcap/tcpdump want to
make use of new ancillary operations (like filtering VLAN in kernel
space), there is currently no sane way to test if this feature /
BPF_S_ANC* op is present or not, since no error is returned. This
patch will make life easier for that and allow for a proper usage
for user space applications.

There was concern, if this patch will break userland. Short answer: Yes
and no. Long answer: It will "break" only for code that calls ...

  { BPF_LD | BPF_(W|H|B) | BPF_ABS, 0, 0, <K> },

... where <K> is in [0xfffff000, 0xffffffff] _and_ <K> is *not* an
ancillary. And here comes the BUT: assuming some *old* code will have
such an instruction where <K> is between [0xfffff000, 0xffffffff] and
it doesn't know ancillary operations, then this will give a
non-expected / unwanted behavior as well (since we do not return the
BPF machine with 0 after a failed load_pointer(), which was the case
before introducing ancillary operations, but load sth. into the
accumulator instead, and continue with the next instruction, for
instance). Thus, user space code would already have been broken by
introducing ancillary operations into the BPF machine per se. Code
that does such a direct load, e.g. "load word at packet offset
0xffffffff into accumulator" ("ld [0xffffffff]") is quite broken,
isn't it? The whole assumption of ancillary operations is that no-one
intentionally calls things like "ld [0xffffffff]" and expect this
word to be loaded from such a packet offset. Hence, we can also safely
make use of this feature testing patch and facilitate application
development. Therefore, at least from this patch onwards, we have
*for sure* a check whether current or in future implemented BPF_S_ANC*
ops are supported in the kernel. Patch was tested on x86_64.

(Thanks to Eric for the previous review.)

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: Ani Sinha <ani@aristanetworks.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-30 02:30:28 -08:00
stephen hemminger
61c5e88aec skbuff: make __kmalloc_reserve static
Sparse detected case where this local function should be static.
It may even allow some compiler optimizations.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 20:32:36 -08:00
stephen hemminger
bb717d7649 tcp: make proc_tcp_fastopen_key static
Detected by sparse.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 20:32:36 -08:00
stephen hemminger
bd2a13e2eb sctp: make sctp_addr_wq_timeout_handler static
Fix sparse warning about local function that should be static.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 20:32:36 -08:00
Eric Dumazet
b2111724a6 net: use per task frag allocator in skb_append_datato_frags
Use the new per task frag allocator in skb_append_datato_frags(),
to reduce number of frags and page allocator overhead.

Tested:
 ifconfig lo mtu 16436
 perf record netperf -t UDP_STREAM ; perf report

before :
 Throughput: 32928 Mbit/s
    51.79%  netperf  [kernel.kallsyms]  [k] copy_user_generic_string
     5.98%  netperf  [kernel.kallsyms]  [k] __alloc_pages_nodemask
     5.58%  netperf  [kernel.kallsyms]  [k] get_page_from_freelist
     5.01%  netperf  [kernel.kallsyms]  [k] __rmqueue
     3.74%  netperf  [kernel.kallsyms]  [k] skb_append_datato_frags
     1.87%  netperf  [kernel.kallsyms]  [k] prep_new_page
     1.42%  netperf  [kernel.kallsyms]  [k] next_zones_zonelist
     1.28%  netperf  [kernel.kallsyms]  [k] __inc_zone_state
     1.26%  netperf  [kernel.kallsyms]  [k] alloc_pages_current
     0.78%  netperf  [kernel.kallsyms]  [k] sock_alloc_send_pskb
     0.74%  netperf  [kernel.kallsyms]  [k] udp_sendmsg
     0.72%  netperf  [kernel.kallsyms]  [k] zone_watermark_ok
     0.68%  netperf  [kernel.kallsyms]  [k] __cpuset_node_allowed_softwall
     0.67%  netperf  [kernel.kallsyms]  [k] fib_table_lookup
     0.60%  netperf  [kernel.kallsyms]  [k] memcpy_fromiovecend
     0.55%  netperf  [kernel.kallsyms]  [k] __udp4_lib_lookup

 after:
  Throughput: 47185 Mbit/s
	61.74%	netperf  [kernel.kallsyms]	[k] copy_user_generic_string
	 2.07%	netperf  [kernel.kallsyms]	[k] prep_new_page
	 1.98%	netperf  [kernel.kallsyms]	[k] skb_append_datato_frags
	 1.02%	netperf  [kernel.kallsyms]	[k] sock_alloc_send_pskb
	 0.97%	netperf  [kernel.kallsyms]	[k] enqueue_task_fair
	 0.97%	netperf  [kernel.kallsyms]	[k] udp_sendmsg
	 0.91%	netperf  [kernel.kallsyms]	[k] __ip_route_output_key
	 0.88%	netperf  [kernel.kallsyms]	[k] __netif_receive_skb
	 0.87%	netperf  [kernel.kallsyms]	[k] fib_table_lookup
	 0.85%	netperf  [kernel.kallsyms]	[k] resched_task
	 0.78%	netperf  [kernel.kallsyms]	[k] __udp4_lib_lookup
	 0.77%	netperf  [kernel.kallsyms]	[k] _raw_spin_lock_irqsave

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 15:25:19 -08:00
Jiri Pirko
210ab6656f dummy: implement carrier change
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 15:24:19 -08:00
Jiri Pirko
9a57247f31 rtnl: expose carrier value with possibility to set it
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 15:24:18 -08:00
Jiri Pirko
fdae0fde53 net: allow to change carrier via sysfs
Make carrier writable

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 15:24:18 -08:00
Jiri Pirko
4bf84c35c6 net: add change_carrier netdev op
This allows a driver to register change_carrier callback which will be
called whenever user will like to change carrier state. This is useful
for devices like dummy, gre, team and so on.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 15:24:18 -08:00
Sasha Levin
b5a05550b7 bnx2x: use ARRAY_SIZE where possible
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-27 20:29:54 -08:00
Linus Torvalds
101e5c7470 Report i2c errors to userspace in lm73 driver
Fix problem with DIV_ROUND_CLOSEST and unsigned divisors in emc6w201 driver
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Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Report i2c errors to userspace in lm73 driver

 - Fix problem with DIV_ROUND_CLOSEST and unsigned divisors in emc6w201
   driver

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (emc6w201) Fix DIV_ROUND_CLOSEST problem with unsigned divisors
  hwmon: (lm73} Detect and report i2c bus errors
2012-12-27 10:46:47 -08:00
Linus Torvalds
ddf75ae34e Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull namespace fixes from Eric Biederman:
 "This tree includes two bug fixes for problems Oleg spotted on his
  review of the recent pid namespace work.  A small fix to not enable
  bottom halves with irqs disabled, and a trivial build fix for f2fs
  with user namespaces enabled."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  f2fs: Don't assign e_id in f2fs_acl_from_disk
  proc: Allow proc_free_inum to be called from any context
  pidns: Stop pid allocation when init dies
  pidns: Outlaw thread creation after unshare(CLONE_NEWPID)
2012-12-27 10:42:46 -08:00
Linus Torvalds
7fd83b47ce Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking fixes from David Miller:

1) GRE tunnel drivers don't set the transport header properly, they also
   blindly deref the inner protocol ipv4 and needs some checks.  Fixes
   from Isaku Yamahata.

2) Fix sleeps while atomic in netdevice rename code, from Eric Dumazet.

3) Fix double-spinlock in solos-pci driver, from Dan Carpenter.

4) More ARP bug fixes.  Fix lockdep splat in arp_solicit() and then the
   bug accidentally added by that fix.  From Eric Dumazet and Cong Wang.

5) Remove some __dev* annotations that slipped back in, as well as all
   HOTPLUG references.  From Greg KH

6) RDS protocol uses wrong interfaces to access scatter-gather elements,
   causing a regression.  From Mike Marciniszyn.

7) Fix build error in cpts driver, from Richard Cochran.

8) Fix arithmetic in packet scheduler, from Stefan Hasko.

9) Similarly, fix association during calculation of random backoff in
   batman-adv.  From Akinobu Mita.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (21 commits)
  ipv6/ip6_gre: set transport header correctly
  ipv4/ip_gre: set transport header correctly to gre header
  IB/rds: suppress incompatible protocol when version is known
  IB/rds: Correct ib_api use with gs_dma_address/sg_dma_len
  net/vxlan: Use the underlying device index when joining/leaving multicast groups
  tcp: should drop incoming frames without ACK flag set
  netprio_cgroup: define sk_cgrp_prioidx only if NETPRIO_CGROUP is enabled
  cpts: fix a run time warn_on.
  cpts: fix build error by removing useless code.
  batman-adv: fix random jitter calculation
  arp: fix a regression in arp_solicit()
  net: sched: integer overflow fix
  CONFIG_HOTPLUG removal from networking core
  Drivers: network: more __dev* removal
  bridge: call br_netpoll_disable in br_add_if
  ipv4: arp: fix a lockdep splat in arp_solicit()
  tuntap: dont use a private kmem_cache
  net: devnet_rename_seq should be a seqcount
  ip_gre: fix possible use after free
  ip_gre: make ipgre_tunnel_xmit() not parse network header as IP unconditionally
  ...
2012-12-27 10:40:30 -08:00
Isaku Yamahata
ae782bb16c ipv6/ip6_gre: set transport header correctly
ip6gre_xmit2() incorrectly sets transport header to inner payload
instead of GRE header. It seems copy-and-pasted from ipip.c.
Set transport header to gre header.
(In ipip case the transport header is the inner ip header, so that's
correct.)

Found by inspection. In practice the incorrect transport header
doesn't matter because the skb usually is sent to another net_device
or socket, so the transport header isn't referenced.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 15:19:56 -08:00
Isaku Yamahata
861aa6d56d ipv4/ip_gre: set transport header correctly to gre header
ipgre_tunnel_xmit() incorrectly sets transport header to inner payload
instead of GRE header. It seems copy-and-pasted from ipip.c.
So set transport header to gre header.
(In ipip case the transport header is the inner ip header, so that's
correct.)

Found by inspection. In practice the incorrect transport header
doesn't matter because the skb usually is sent to another net_device
or socket, so the transport header isn't referenced.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 15:19:56 -08:00
Marciniszyn, Mike
a49675988c IB/rds: suppress incompatible protocol when version is known
Add an else to only print the incompatible protocol message
when version hasn't been established.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 15:17:37 -08:00
Marciniszyn, Mike
f2e9bd7032 IB/rds: Correct ib_api use with gs_dma_address/sg_dma_len
0b088e00 ("RDS: Use page_remainder_alloc() for recv bufs")
added uses of sg_dma_len() and sg_dma_address(). This makes
RDS DOA with the qib driver.

IB ulps should use ib_sg_dma_len() and ib_sg_dma_address
respectively since some HCAs overload ib_sg_dma* operations.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 15:17:37 -08:00
Yan Burman
af9b078e35 net/vxlan: Use the underlying device index when joining/leaving multicast groups
The socket calls from vxlan to join/leave multicast group aren't
using the index of the underlying device, as a result the stack uses
the first interface that is up. This results in vxlan being non functional
over a device which isn't the 1st to be up.
Fix this by providing the iflink field to the vxlan instance
to the multicast calls.

Signed-off-by: Yan Burman <yanb@mellanox.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 15:09:55 -08:00
Eric Dumazet
c3ae62af8e tcp: should drop incoming frames without ACK flag set
In commit 96e0bf4b51 (tcp: Discard segments that ack data not yet
sent) John Dykstra enforced a check against ack sequences.

In commit 354e4aa391 (tcp: RFC 5961 5.2 Blind Data Injection Attack
Mitigation) I added more safety tests.

But we missed fact that these tests are not performed if ACK bit is
not set.

RFC 793 3.9 mandates TCP should drop a frame without ACK flag set.

" fifth check the ACK field,
      if the ACK bit is off drop the segment and return"

Not doing so permits an attacker to only guess an acceptable sequence
number, evading stronger checks.

Many thanks to Zhiyun Qian for bringing this issue to our attention.

See :
http://web.eecs.umich.edu/~zhiyunq/pub/ccs12_TCP_sequence_number_inference.pdf

Reported-by: Zhiyun Qian <zhiyunq@umich.edu>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Nandita Dukkipati <nanditad@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: John Dykstra <john.dykstra1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 15:08:55 -08:00
Christoffer Dall
ad4b3fb7ff mm: Fix PageHead when !CONFIG_PAGEFLAGS_EXTENDED
Unfortunately with !CONFIG_PAGEFLAGS_EXTENDED, (!PageHead) is false, and
(PageHead) is true, for tail pages.  If this is indeed the intended
behavior, which I doubt because it breaks cache cleaning on some ARM
systems, then the nomenclature is highly problematic.

This patch makes sure PageHead is only true for head pages and PageTail
is only true for tail pages, and neither is true for non-compound pages.

[ This buglet seems ancient - seems to have been introduced back in Apr
  2008 in commit 6a1e7f777f: "pageflags: convert to the use of new
  macros".  And the reason nobody noticed is because the PageHead()
  tests are almost all about just sanity-checking, and only used on
  pages that are actual page heads.  The fact that the old code returned
  true for tail pages too was thus not really noticeable.   - Linus ]

Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
Acked-by:  Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Will Deacon <Will.Deacon@arm.com>
Cc: Steve Capper <Steve.Capper@arm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: stable@kernel.org  # 2.6.26+
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-26 14:57:34 -08:00
Li Zefan
3d0dcfbd8f netprio_cgroup: define sk_cgrp_prioidx only if NETPRIO_CGROUP is enabled
sock->sk_cgrp_prioidx won't be used at all if CONFIG_NETPRIO_CGROUP=n.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 14:16:23 -08:00
Richard Cochran
ccb6e984a1 cpts: fix a run time warn_on.
This patch fixes a warning in clk_enable by calling clk_prepare_enable
instead.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 14:15:09 -08:00
Richard Cochran
cbc44dbe1f cpts: fix build error by removing useless code.
The cpts driver tries to obtain the input clock frequency by calling the
clock's internal 'recalc' method. Since <plat/clock.h> has been removed,
this code can no longer compile.

However, the driver never makes use of the frequency value, so this patch
fixes the issue by removing the offending code altogether.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 14:15:09 -08:00
Akinobu Mita
143cdd8f33 batman-adv: fix random jitter calculation
batadv_iv_ogm_emit_send_time() attempts to calculates a random integer
in the range of 'orig_interval +- BATADV_JITTER' by the below lines.

        msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
        msecs += (random32() % 2 * BATADV_JITTER);

But it actually gets 'orig_interval' or 'orig_interval - BATADV_JITTER'
because '%' and '*' have same precedence and associativity is
left-to-right.

This adds the parentheses at the appropriate position so that it matches
original intension.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Antonio Quartulli <ordex@autistici.org>
Cc: Marek Lindner <lindner_marek@yahoo.de>
Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Cc: Antonio Quartulli <ordex@autistici.org>
Cc: b.a.t.m.a.n@lists.open-mesh.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-26 14:13:23 -08:00
Eric W. Biederman
48c6d1217e f2fs: Don't assign e_id in f2fs_acl_from_disk
With user namespaces enabled building f2fs fails with:

 CC      fs/f2fs/acl.o
fs/f2fs/acl.c: In function ‘f2fs_acl_from_disk’:
fs/f2fs/acl.c:85:21: error: ‘struct posix_acl_entry’ has no member named ‘e_id’
make[2]: *** [fs/f2fs/acl.o] Error 1
make[2]: Target `__build' not remade because of errors.

e_id is a backwards compatibility field only used for file systems
that haven't been converted to use kuids and kgids.  When the posix
acl tag field is neither ACL_USER nor ACL_GROUP assigning e_id is
unnecessary.  Remove the assignment so f2fs will build with user
namespaces enabled.

Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Amit Sahrawat <a.sahrawat@samsung.com>
Acked-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-12-25 20:05:15 -08:00
Eric W. Biederman
dfb2ea45be proc: Allow proc_free_inum to be called from any context
While testing the pid namespace code I hit this nasty warning.

[  176.262617] ------------[ cut here ]------------
[  176.263388] WARNING: at /home/eric/projects/linux/linux-userns-devel/kernel/softirq.c:160 local_bh_enable_ip+0x7a/0xa0()
[  176.265145] Hardware name: Bochs
[  176.265677] Modules linked in:
[  176.266341] Pid: 742, comm: bash Not tainted 3.7.0userns+ #18
[  176.266564] Call Trace:
[  176.266564]  [<ffffffff810a539f>] warn_slowpath_common+0x7f/0xc0
[  176.266564]  [<ffffffff810a53fa>] warn_slowpath_null+0x1a/0x20
[  176.266564]  [<ffffffff810ad9ea>] local_bh_enable_ip+0x7a/0xa0
[  176.266564]  [<ffffffff819308c9>] _raw_spin_unlock_bh+0x19/0x20
[  176.266564]  [<ffffffff8123dbda>] proc_free_inum+0x3a/0x50
[  176.266564]  [<ffffffff8111d0dc>] free_pid_ns+0x1c/0x80
[  176.266564]  [<ffffffff8111d195>] put_pid_ns+0x35/0x50
[  176.266564]  [<ffffffff810c608a>] put_pid+0x4a/0x60
[  176.266564]  [<ffffffff8146b177>] tty_ioctl+0x717/0xc10
[  176.266564]  [<ffffffff810aa4d5>] ? wait_consider_task+0x855/0xb90
[  176.266564]  [<ffffffff81086bf9>] ? default_spin_lock_flags+0x9/0x10
[  176.266564]  [<ffffffff810cab0a>] ? remove_wait_queue+0x5a/0x70
[  176.266564]  [<ffffffff811e37e8>] do_vfs_ioctl+0x98/0x550
[  176.266564]  [<ffffffff810b8a0f>] ? recalc_sigpending+0x1f/0x60
[  176.266564]  [<ffffffff810b9127>] ? __set_task_blocked+0x37/0x80
[  176.266564]  [<ffffffff810ab95b>] ? sys_wait4+0xab/0xf0
[  176.266564]  [<ffffffff811e3d31>] sys_ioctl+0x91/0xb0
[  176.266564]  [<ffffffff810a95f0>] ? task_stopped_code+0x50/0x50
[  176.266564]  [<ffffffff81939199>] system_call_fastpath+0x16/0x1b
[  176.266564] ---[ end trace 387af88219ad6143 ]---

It turns out that spin_unlock_bh(proc_inum_lock) is not safe when
put_pid is called with another spinlock held and irqs disabled.

For now take the easy path and use spin_lock_irqsave(proc_inum_lock)
in proc_free_inum and spin_loc_irq in proc_alloc_inum(proc_inum_lock).

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-12-25 16:23:12 -08:00
Eric W. Biederman
c876ad7682 pidns: Stop pid allocation when init dies
Oleg pointed out that in a pid namespace the sequence.
- pid 1 becomes a zombie
- setns(thepidns), fork,...
- reaping pid 1.
- The injected processes exiting.

Can lead to processes attempting access their child reaper and
instead following a stale pointer.

That waitpid for init can return before all of the processes in
the pid namespace have exited is also unfortunate.

Avoid these problems by disabling the allocation of new pids in a pid
namespace when init dies, instead of when the last process in a pid
namespace is reaped.

Pointed-out-by:  Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-12-25 16:10:05 -08:00
Eric W. Biederman
8382fcac1b pidns: Outlaw thread creation after unshare(CLONE_NEWPID)
The sequence:
unshare(CLONE_NEWPID)
clone(CLONE_THREAD|CLONE_SIGHAND|CLONE_VM)

Creates a new process in the new pid namespace without setting
pid_ns->child_reaper.  After forking this results in a NULL
pointer dereference.

Avoid this and other nonsense scenarios that can show up after
creating a new pid namespace with unshare by adding a new
check in copy_prodcess.

Pointed-out-by:  Oleg Nesterov <oleg@redhat.com>
Acked-by:  Oleg Nesterov <oleg@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-12-24 22:53:14 -08:00
Cong Wang
cf0be88057 arp: fix a regression in arp_solicit()
Sedat reported the following commit caused a regression:

commit 9650388b5c
Author: Eric Dumazet <edumazet@google.com>
Date:   Fri Dec 21 07:32:10 2012 +0000

    ipv4: arp: fix a lockdep splat in arp_solicit

This is due to the 6th parameter of arp_send() needs to be NULL
for the broadcast case, the above commit changed it to an all-zero
array by mistake.

Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-24 18:42:58 -08:00
Linus Torvalds
637704cbc9 Merge branch 'i2c-embedded/for-next' of git://git.pengutronix.de/git/wsa/linux
Pull i2c __dev* attribute removal from Wolfram Sang:
 "The squashed patches from Bill to get rid of the __dev* annotations in
  the i2c subsystem.  I couldn't include it in my previous pull request
  due to some dependency with the mfd subsystem.  I had this patch in
  linux-next for two days before rc1 and nothing popped up."

* 'i2c-embedded/for-next' of git://git.pengutronix.de/git/wsa/linux:
  i2c: remove __dev* attributes from subsystem
2012-12-23 09:48:33 -08:00
Zlatko Calusic
4ae0a48b5e mm: modify pgdat_balanced() so that it also handles order-0
Teach pgdat_balanced() about order-0 allocations so that we can simplify
code in a few places in vmstat.c.

Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Zlatko Calusic <zlatko.calusic@iskon.hr>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-23 09:46:36 -08:00
Rafael J. Wysocki
9c016d6109 Partly revert "[media] uvcvideo: Set error_idx properly for extended controls API failures"
Commit f0ed2ce840 ("[media] uvcvideo: Set error_idx properly for
extended controls API failures") causes user space to behave incorrectly
on one of my test machines (there is no sound under KDE 4.9.4 using
pulseaudio and there is a knotify4 process occupying one of the CPU
cores 100% of the time).  Reverting that commit entirely fixes the
problem for me.

However, commit f0ed2ce840 appears to do more than it follows from its
changelog, because the changelog only says about the changes related to
ctrls->error_idx, while the commit additionally changes error codes
returned by various functions in uvc_ctrl.c and uvc_v4l2.c.  It turns
out that the changes of the returned error codes confuse the user spce,
so it is sufficient to revert the part of commit f0ed2ce840 not
mentioned in its changelog to fix the problem.

[ 'ENOENT' is not a valid error return from an ioctl to begin with, and
  I don't understand how anybody ever even thought it would be.  - Linus ]

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-23 09:39:14 -08:00
Bill Pemberton
0b255e927d i2c: remove __dev* attributes from subsystem
CONFIG_HOTPLUG is going away as an option.  As result the __dev*
markings will be going away.

Remove use of __devinit, __devexit_p, __devinitdata, __devinitconst,
and __devexit.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Acked-by: Peter Korsgaard <peter.korsgaard@barco.com> (for ocores and mux-gpio)
Acked-by: Havard Skinnemoen <hskinnemoen@gmail.com> (for i2c-gpio)
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> (for puf3)
Acked-by: Barry Song <baohua.song@csr.com> (for sirf)
Reviewed-by: Jean Delvare <khali@linux-fr.org>
[wsa: Fixed "foo* bar" flaws while we are here]
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
2012-12-22 20:13:45 +01:00
Guenter Roeck
86266ca0e2 hwmon: (emc6w201) Fix DIV_ROUND_CLOSEST problem with unsigned divisors
Result of DIV_ROUND_CLOSEST is undefined for negative dividends if the divisor
variable type is unsigned. Fix by declaring divisor as signed variable.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-12-22 02:16:40 -08:00
Stefan Hasko
d2fe85da52 net: sched: integer overflow fix
Fixed integer overflow in function htb_dequeue

Signed-off-by: Stefan Hasko <hasko.stevo@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-22 00:03:00 -08:00