1. 22 Apr, 2014 1 commit
  2. 16 Apr, 2014 2 commits
    • Anatol Pomozov's avatar
      aio: block io_destroy() until all context requests are completed · e02ba72a
      Anatol Pomozov authored
      deletes aio context and all resources related to. It makes sense that
      no IO operations connected to the context should be running after the context
      is destroyed. As we removed io_context we have no chance to
      get requests status or call io_getevents().
      
      man page for io_destroy says that this function may block until
      all context's requests are completed. Before kernel 3.11 io_destroy()
      blocked indeed, but since aio refactoring in 3.11 it is not true anymore.
      
      Here is a pseudo-code that shows a testcase for a race condition discovered
      in 3.11:
      
        initialize io_context
        io_submit(read to buffer)
        io_destroy()
      
        // context is destroyed so we can free the resources
        free(buffers);
      
        // if the buffer is allocated by some other user he'll be surprised
        // to learn that the buffer still filled by an outstanding operation
        // from the destroyed io_context
      
      The fix is straight-forward - add a completion struct and wait on it
      in io_destroy, complete() should be called when number of in-fligh requests
      reaches zero.
      
      If two or more io_destroy() called for the same context simultaneously then
      only the first one waits for IO completion, other calls behaviour is undefined.
      
      Tested: ran http://pastebin.com/LrPsQ4RL
      
       testcase for several hours and
        do not see the race condition anymore.
      Signed-off-by: default avatarAnatol Pomozov <anatol.pomozov@gmail.com>
      Signed-off-by: default avatarBenjamin LaHaise <bcrl@kvack.org>
      e02ba72a
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 10ec34fc
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Fix BPF filter validation of netlink attribute accesses, from
          Mathias Kruase.
      
       2) Netfilter conntrack generation seqcount not initialized properly,
          from Andrey Vagin.
      
       3) Fix comparison mask computation on big-endian in nft_cmp_fast(),
          from Patrick McHardy.
      
       4) Properly limit MTU over ipv6, from Eric Dumazet.
      
       5) Fix seccomp system call argument population on 32-bit, from Daniel
          Borkmann.
      
       6) skb_network_protocol() should not use hard-coded ETH_HLEN, instead
          skb->mac_len needs to be used.  From Vlad Yasevich.
      
       7) We have several cases of using socket based communications to
          implement a tunnel.  For example, some tunnels are encapsulations
          over UDP so we use an internal kernel UDP socket to do the
          transmits.
      
          These tunnels should behave just like other software devices and
          pass the packets on down to the next layer.
      
          Most importantly we want the top-level socket (eg TCP) that created
          the traffic to be charged for the SKB memory.
      
          However, once you get into the IP output path, we have code that
          assumed that whatever was attached to skb->sk is an IP socket.
      
          To keep the top-level socket being charged for the SKB memory,
          whilst satisfying the needs of the IP output path, we now pass in an
          explicit 'sk' argument.
      
          From Eric Dumazet.
      
       8) ping_init_sock() leaks group info, from Xiaoming Wang.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (33 commits)
        cxgb4: use the correct max size for firmware flash
        qlcnic: Fix MSI-X initialization code
        ip6_gre: don't allow to remove the fb_tunnel_dev
        ipv4: add a sock pointer to dst->output() path.
        ipv4: add a sock pointer to ip_queue_xmit()
        driver/net: cosa driver uses udelay incorrectly
        at86rf230: fix __at86rf230_read_subreg function
        at86rf230: remove check if AVDD settled
        net: cadence: Add architecture dependencies
        net: Start with correct mac_len in skb_network_protocol
        Revert "net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer"
        cxgb4: Save the correct mac addr for hw-loopback connections in the L2T
        net: filter: seccomp: fix wrong decoding of BPF_S_ANC_SECCOMP_LD_W
        seccomp: fix populating a0-a5 syscall args in 32-bit x86 BPF
        qlcnic: Do not disable SR-IOV when VFs are assigned to VMs
        qlcnic: Fix QLogic application/driver interface for virtual NIC configuration
        qlcnic: Fix PVID configuration on eSwitch port.
        qlcnic: Fix max ring count calculation
        qlcnic: Fix to send INIT_NIC_FUNC as first mailbox.
        qlcnic: Fix panic due to uninitialzed delayed_work struct in use.
        ...
      10ec34fc
  3. 15 Apr, 2014 9 commits
  4. 14 Apr, 2014 28 commits