1. 28 Feb, 2011 17 commits
  2. 27 Feb, 2011 1 commit
  3. 25 Feb, 2011 3 commits
  4. 23 Feb, 2011 8 commits
  5. 22 Feb, 2011 9 commits
  6. 21 Feb, 2011 2 commits
    • Christian Lamparter's avatar
      p54pci: update receive dma buffers before and after processing · 0bf719df
      Christian Lamparter authored
      Documentation/DMA-API-HOWTO.txt states:
      
      "DMA transfers need to be synced properly in order for
      the cpu and device to see the most uptodate and correct
      copy of the DMA buffer."
      
      Cc: <stable@kernel.org>
      Signed-off-by: default avatarChristian Lamparter <chunkeey@googlemail.com>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      0bf719df
    • Daniel J Blueman's avatar
      fix cfg80211_wext_siwfreq lock ordering... · 4f919a3b
      Daniel J Blueman authored
      I previously managed to reproduce a hang while scanning wireless
      channels (reproducible with airodump-ng hopping channels); subsequent
      lockdep instrumentation revealed a lock ordering issue.
      
      Without knowing the design intent, it looks like the locks should be
      taken in reverse order; please comment.
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.38-rc5-341cd #4
      -------------------------------------------------------
      airodump-ng/15445 is trying to acquire lock:
       (&rdev->devlist_mtx){+.+.+.}, at: [<ffffffff816b1266>]
      cfg80211_wext_siwfreq+0xc6/0x100
      
      but task is already holding lock:
       (&wdev->mtx){+.+.+.}, at: [<ffffffff816b125c>] cfg80211_wext_siwfreq+0xbc/0x100
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&wdev->mtx){+.+.+.}:
             [<ffffffff810a79d6>] lock_acquire+0xc6/0x280
             [<ffffffff816d6bce>] mutex_lock_nested+0x6e/0x4b0
             [<ffffffff81696080>] cfg80211_netdev_notifier_call+0x430/0x5f0
             [<ffffffff8109351b>] notifier_call_chain+0x8b/0x100
             [<ffffffff810935b1>] raw_notifier_call_chain+0x11/0x20
             [<ffffffff81576d92>] call_netdevice_notifiers+0x32/0x60
             [<ffffffff815771a4>] __dev_notify_flags+0x34/0x80
             [<ffffffff81577230>] dev_change_flags+0x40/0x70
             [<ffffffff8158587c>] do_setlink+0x1fc/0x8d0
             [<ffffffff81586042>] rtnl_setlink+0xf2/0x140
             [<ffffffff81586923>] rtnetlink_rcv_msg+0x163/0x270
             [<ffffffff8159d741>] netlink_rcv_skb+0xa1/0xd0
             [<ffffffff815867b0>] rtnetlink_rcv+0x20/0x30
             [<ffffffff8159d39a>] netlink_unicast+0x2ba/0x300
             [<ffffffff8159dd57>] netlink_sendmsg+0x267/0x3e0
             [<ffffffff8155e364>] sock_sendmsg+0xe4/0x110
             [<ffffffff8155f3a3>] sys_sendmsg+0x253/0x3b0
             [<ffffffff81003192>] system_call_fastpath+0x16/0x1b
      
      -> #0 (&rdev->devlist_mtx){+.+.+.}:
             [<ffffffff810a7222>] __lock_acquire+0x1622/0x1d10
             [<ffffffff810a79d6>] lock_acquire+0xc6/0x280
             [<ffffffff816d6bce>] mutex_lock_nested+0x6e/0x4b0
             [<ffffffff816b1266>] cfg80211_wext_siwfreq+0xc6/0x100
             [<ffffffff816b2fad>] ioctl_standard_call+0x5d/0xd0
             [<ffffffff816b3223>] T.808+0x163/0x170
             [<ffffffff816b326a>] wext_handle_ioctl+0x3a/0x90
             [<ffffffff815798d2>] dev_ioctl+0x6f2/0x830
             [<ffffffff8155cf3d>] sock_ioctl+0xfd/0x290
             [<ffffffff8117dffd>] do_vfs_ioctl+0x9d/0x590
             [<ffffffff8117e53a>] sys_ioctl+0x4a/0x80
             [<ffffffff81003192>] system_call_fastpath+0x16/0x1b
      
      other info that might help us debug this:
      
      2 locks held by airodump-ng/15445:
       #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff81586782>] rtnl_lock+0x12/0x20
       #1:  (&wdev->mtx){+.+.+.}, at: [<ffffffff816b125c>]
      cfg80211_wext_siwfreq+0xbc/0x100
      
      stack backtrace:
      Pid: 15445, comm: airodump-ng Not tainted 2.6.38-rc5-341cd #4
      Call Trace:
       [<ffffffff810a3f0a>] ? print_circular_bug+0xfa/0x100
       [<ffffffff810a7222>] ? __lock_acquire+0x1622/0x1d10
       [<ffffffff810a1f99>] ? trace_hardirqs_off_caller+0x29/0xc0
       [<ffffffff810a79d6>] ? lock_acquire+0xc6/0x280
       [<ffffffff816b1266>] ? cfg80211_wext_siwfreq+0xc6/0x100
       [<ffffffff810a31d7>] ? mark_held_locks+0x67/0x90
       [<ffffffff816d6bce>] ? mutex_lock_nested+0x6e/0x4b0
       [<ffffffff816b1266>] ? cfg80211_wext_siwfreq+0xc6/0x100
       [<ffffffff810a31d7>] ? mark_held_locks+0x67/0x90
       [<ffffffff816b1266>] ? cfg80211_wext_siwfreq+0xc6/0x100
       [<ffffffff816b1266>] ? cfg80211_wext_siwfreq+0xc6/0x100
       [<ffffffff816b2fad>] ? ioctl_standard_call+0x5d/0xd0
       [<ffffffff8157818b>] ? __dev_get_by_name+0x9b/0xc0
       [<ffffffff816b2f50>] ? ioctl_standard_call+0x0/0xd0
       [<ffffffff816b3223>] ? T.808+0x163/0x170
       [<ffffffff8112ddf2>] ? might_fault+0x72/0xd0
       [<ffffffff816b326a>] ? wext_handle_ioctl+0x3a/0x90
       [<ffffffff8112de3b>] ? might_fault+0xbb/0xd0
       [<ffffffff815798d2>] ? dev_ioctl+0x6f2/0x830
       [<ffffffff810a1bae>] ? put_lock_stats+0xe/0x40
       [<ffffffff810a1c8c>] ? lock_release_holdtime+0xac/0x150
       [<ffffffff8155cf3d>] ? sock_ioctl+0xfd/0x290
       [<ffffffff8117dffd>] ? do_vfs_ioctl+0x9d/0x590
       [<ffffffff8116c8ff>] ? fget_light+0x1df/0x3c0
       [<ffffffff8117e53a>] ? sys_ioctl+0x4a/0x80
       [<ffffffff81003192>] ? system_call_fastpath+0x16/0x1b
      Signed-off-by: default avatarDaniel J Blueman <daniel.blueman@gmail.com>
      Acked-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      4f919a3b