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e1000: fix lockdep warning in e1000_reset_task
The patch fixes the following lockdep warning, which is 100% reproducible on network restart: ====================================================== [ INFO: possible circular locking dependency detected ] 3.12.0+ torvalds#47 Tainted: GF ------------------------------------------------------- kworker/1:1/27 is trying to acquire lock: ((&(&adapter->watchdog_task)->work)){+.+...}, at: [<ffffffff8108a5b0>] flush_work+0x0/0x70 but task is already holding lock: (&adapter->mutex){+.+...}, at: [<ffffffffa0177c0a>] e1000_reset_task+0x4a/0xa0 [e1000] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&adapter->mutex){+.+...}: [<ffffffff810bdb5d>] lock_acquire+0x9d/0x120 [<ffffffff816b8cbc>] mutex_lock_nested+0x4c/0x390 [<ffffffffa017233d>] e1000_watchdog+0x7d/0x5b0 [e1000] [<ffffffff8108b972>] process_one_work+0x1d2/0x510 [<ffffffff8108ca80>] worker_thread+0x120/0x3a0 [<ffffffff81092c1e>] kthread+0xee/0x110 [<ffffffff816c3d7c>] ret_from_fork+0x7c/0xb0 -> #0 ((&(&adapter->watchdog_task)->work)){+.+...}: [<ffffffff810bd9c0>] __lock_acquire+0x1710/0x1810 [<ffffffff810bdb5d>] lock_acquire+0x9d/0x120 [<ffffffff8108a5eb>] flush_work+0x3b/0x70 [<ffffffff8108b5d8>] __cancel_work_timer+0x98/0x140 [<ffffffff8108b693>] cancel_delayed_work_sync+0x13/0x20 [<ffffffffa0170cec>] e1000_down_and_stop+0x3c/0x60 [e1000] [<ffffffffa01775b1>] e1000_down+0x131/0x220 [e1000] [<ffffffffa0177c12>] e1000_reset_task+0x52/0xa0 [e1000] [<ffffffff8108b972>] process_one_work+0x1d2/0x510 [<ffffffff8108ca80>] worker_thread+0x120/0x3a0 [<ffffffff81092c1e>] kthread+0xee/0x110 [<ffffffff816c3d7c>] ret_from_fork+0x7c/0xb0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&adapter->mutex); lock((&(&adapter->watchdog_task)->work)); lock(&adapter->mutex); lock((&(&adapter->watchdog_task)->work)); *** DEADLOCK *** 3 locks held by kworker/1:1/27: #0: (events){.+.+.+}, at: [<ffffffff8108b906>] process_one_work+0x166/0x510 #1: ((&adapter->reset_task)){+.+...}, at: [<ffffffff8108b906>] process_one_work+0x166/0x510 #2: (&adapter->mutex){+.+...}, at: [<ffffffffa0177c0a>] e1000_reset_task+0x4a/0xa0 [e1000] stack backtrace: CPU: 1 PID: 27 Comm: kworker/1:1 Tainted: GF 3.12.0+ torvalds#47 Hardware name: System manufacturer System Product Name/P5B-VM SE, BIOS 0501 05/31/2007 Workqueue: events e1000_reset_task [e1000] ffffffff820f6000 ffff88007b9dba98 ffffffff816b54a2 0000000000000002 ffffffff820f5e50 ffff88007b9dbae8 ffffffff810ba936 ffff88007b9dbac8 ffff88007b9dbb48 ffff88007b9d8f00 ffff88007b9d8780 ffff88007b9d8f00 Call Trace: [<ffffffff816b54a2>] dump_stack+0x49/0x5f [<ffffffff810ba936>] print_circular_bug+0x216/0x310 [<ffffffff810bd9c0>] __lock_acquire+0x1710/0x1810 [<ffffffff8108a5b0>] ? __flush_work+0x250/0x250 [<ffffffff810bdb5d>] lock_acquire+0x9d/0x120 [<ffffffff8108a5b0>] ? __flush_work+0x250/0x250 [<ffffffff8108a5eb>] flush_work+0x3b/0x70 [<ffffffff8108a5b0>] ? __flush_work+0x250/0x250 [<ffffffff8108b5d8>] __cancel_work_timer+0x98/0x140 [<ffffffff8108b693>] cancel_delayed_work_sync+0x13/0x20 [<ffffffffa0170cec>] e1000_down_and_stop+0x3c/0x60 [e1000] [<ffffffffa01775b1>] e1000_down+0x131/0x220 [e1000] [<ffffffffa0177c12>] e1000_reset_task+0x52/0xa0 [e1000] [<ffffffff8108b972>] process_one_work+0x1d2/0x510 [<ffffffff8108b906>] ? process_one_work+0x166/0x510 [<ffffffff8108ca80>] worker_thread+0x120/0x3a0 [<ffffffff8108c960>] ? manage_workers+0x2c0/0x2c0 [<ffffffff81092c1e>] kthread+0xee/0x110 [<ffffffff81092b30>] ? __init_kthread_worker+0x70/0x70 [<ffffffff816c3d7c>] ret_from_fork+0x7c/0xb0 [<ffffffff81092b30>] ? __init_kthread_worker+0x70/0x70 == The issue background == The problem occurs, because e1000_down(), which is called under adapter->mutex by e1000_reset_task(), tries to synchronously cancel e1000 auxiliary works (reset_task, watchdog_task, phy_info_task, fifo_stall_task), which take adapter->mutex in their handlers. So the question is what does adapter->mutex protect there? The adapter->mutex was introduced by commit 0ef4ee ("e1000: convert to private mutex from rtnl") as a replacement for rtnl_lock() taken in the asynchronous handlers. It targeted on fixing a similar lockdep warning issued when e1000_down() was called under rtnl_lock(), and it fixed it, but unfortunately it introduced the lockdep warning described above. Anyway, that said the source of this bug is that the asynchronous works were made to take rtnl_lock() some time ago, so let's look deeper and find why it was added there. The rtnl_lock() was added to asynchronous handlers by commit 338c15 ("e1000: fix occasional panic on unload") in order to prevent asynchronous handlers from execution after the module is unloaded (e1000_down() is called) as it follows from the comment to the commit: > Net drivers in general have an issue where timers fired > by mod_timer or work threads with schedule_work are running > outside of the rtnl_lock. > > With no other lock protection these routines are vulnerable > to races with driver unload or reset paths. > > The longer term solution to this might be a redesign with > safer locks being taken in the driver to guarantee no > reentrance, but for now a safe and effective fix is > to take the rtnl_lock in these routines. I'm not sure if this locking scheme fixed the problem or just made it unlikely, although I incline to the latter. Anyway, this was long time ago when e1000 auxiliary works were implemented as timers scheduling real work handlers in their routines. The e1000_down() function only canceled the timers, but left the real handlers running if they were running, which could result in work execution after module unload. Today, the e1000 driver uses sane delayed works instead of the pair timer+work to implement its delayed asynchronous handlers, and the e1000_down() synchronously cancels all the works so that the problem that commit 338c15 tried to cope with disappeared, and we don't need any locks in the handlers any more. Moreover, any locking there can potentially result in a deadlock. So, this patch reverts commits 0ef4ee and 338c15. Fixes: 0ef4eed ("e1000: convert to private mutex from rtnl") Fixes: 338c15e ("e1000: fix occasional panic on unload") Cc: Tushar Dave <tushar.n.dave@intel.com> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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