1. 01 May, 2013 3 commits
    • Neil Horman's avatar
      netpoll: convert mutex into a semaphore · bd7c4b60
      Neil Horman authored
      Bart Van Assche recently reported a warning to me:
      
      <IRQ>  [<ffffffff8103d79f>] warn_slowpath_common+0x7f/0xc0
      [<ffffffff8103d7fa>] warn_slowpath_null+0x1a/0x20
      [<ffffffff814761dd>] mutex_trylock+0x16d/0x180
      [<ffffffff813968c9>] netpoll_poll_dev+0x49/0xc30
      [<ffffffff8136a2d2>] ? __alloc_skb+0x82/0x2a0
      [<ffffffff81397715>] netpoll_send_skb_on_dev+0x265/0x410
      [<ffffffff81397c5a>] netpoll_send_udp+0x28a/0x3a0
      [<ffffffffa0541843>] ? write_msg+0x53/0x110 [netconsole]
      [<ffffffffa05418bf>] write_msg+0xcf/0x110 [netconsole]
      [<ffffffff8103eba1>] call_console_drivers.constprop.17+0xa1/0x1c0
      [<ffffffff8103fb76>] console_unlock+0x2d6/0x450
      [<ffffffff8104011e>] vprintk_emit+0x1ee/0x510
      [<ffffffff8146f9f6>] printk+0x4d/0x4f
      [<ffffffffa0004f1d>] scsi_print_command+0x7d/0xe0 [scsi_mod]
      
      This resulted from my commit ca99ca14 which introduced a mutex_trylock
      operation in a path that could execute in interrupt context.  When mutex
      debugging is enabled, the above warns the user when we are in fact
      exectuting in interrupt context
      interrupt context.
      
      After some discussion, It seems that a semaphore is the proper mechanism to use
      here.  While mutexes are defined to be unusable in interrupt context, no such
      condition exists for semaphores (save for the fact that the non blocking api
      calls, like up and down_trylock must be used when in irq context).
      Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Reported-by: default avatarBart Van Assche <bvanassche@acm.org>
      CC: Bart Van Assche <bvanassche@acm.org>
      CC: David Miller <davem@davemloft.net>
      CC: netdev@vger.kernel.org
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bd7c4b60
    • Pravin B Shelar's avatar
      netlink: Fix skb ref counting. · ae6164ad
      Pravin B Shelar authored
      Commit f9c22888 (netlink:
      implement memory mapped recvmsg) increamented skb->users
      ref count twice for a dump op which does not look right.
      
      Following patch fixes that.
      
      CC: Patrick McHardy <kaber@trash.net>
      Signed-off-by: default avatarPravin B Shelar <pshelar@nicira.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ae6164ad
    • Jamal Hadi Salim's avatar
      net_sched: act_ipt forward compat with xtables · 0dcffd09
      Jamal Hadi Salim authored
      Deal with changes in newer xtables while maintaining backward
      compatibility. Thanks to Jan Engelhardt for suggestions.
      Signed-off-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0dcffd09
  2. 30 Apr, 2013 14 commits
  3. 29 Apr, 2013 23 commits