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| author | Sasha Levin <levinsasha928@gmail.com> | 2012-04-13 17:48:36 -0400 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-05-22 12:16:10 +0930 |
| commit | 991ad9ec39bd3ecaf08cfb7ea3ef7ae9148e5068 (patch) | |
| tree | e00677171268552c799be4d3b6218f35fa1170ed /net/9p/trans_virtio.c | |
| parent | 33950c6e2269f516059e2fa777f8c7559dfa31a5 (diff) | |
| download | lwn-991ad9ec39bd3ecaf08cfb7ea3ef7ae9148e5068.tar.gz lwn-991ad9ec39bd3ecaf08cfb7ea3ef7ae9148e5068.zip | |
9p: disconnect channel when PCI device is removed
When a virtio_9p pci device is being removed, we should close down any
active channels and free up resources, we're not supposed to BUG() if there's
still an open channel since it's a valid case when removing the PCI device.
Otherwise, removing the PCI device with an open channel would cause the
following BUG():
[ 1184.671416] ------------[ cut here ]------------
[ 1184.672057] kernel BUG at net/9p/trans_virtio.c:618!
[ 1184.672057] invalid opcode: 0000 [#1] PREEMPT SMP
[ 1184.672057] CPU 3
[ 1184.672057] Pid: 5, comm: kworker/u:0 Tainted: G W 3.4.0-rc2-next-20120413-sasha-dirty #76
[ 1184.672057] RIP: 0010:[<ffffffff825c9116>] [<ffffffff825c9116>] p9_virtio_remove+0x16/0x90
[ 1184.672057] RSP: 0018:ffff88000d653ac0 EFLAGS: 00010202
[ 1184.672057] RAX: ffffffff836bfb40 RBX: ffff88000c9b2148 RCX: ffff88000d658978
[ 1184.672057] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff880028868000
[ 1184.672057] RBP: ffff88000d653ad0 R08: 0000000000000000 R09: 0000000000000000
[ 1184.672057] R10: 0000000000000000 R11: 0000000000000001 R12: ffff880028868000
[ 1184.672057] R13: ffffffff835aa7c0 R14: ffff880041630000 R15: ffff88000d653da0
[ 1184.672057] FS: 0000000000000000(0000) GS:ffff880035a00000(0000) knlGS:0000000000000000
[ 1184.672057] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1184.672057] CR2: 0000000001181000 CR3: 000000000eba1000 CR4: 00000000000406e0
[ 1184.672057] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
x000000000117a190 *[ 1184.672057] DR3: 00000000000000**
00 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1184.672057] Process kworker/u:0 (pid: 5, threadinfo ffff88000d652000, task ffff88000d658000)
[ 1184.672057] Stack:
[ 1184.672057] ffff880028868000 ffffffff836bfb40 ffff88000d653af0 ffffffff8193661b
[ 1184.672057] ffff880028868008 ffffffff836bfb40 ffff88000d653b10 ffffffff81af1c81
[ 1184.672057] ffff880028868068 ffff880028868008 ffff88000d653b30 ffffffff81af257a
[ 1184.795301] Call Trace:
[ 1184.795301] [<ffffffff8193661b>] virtio_dev_remove+0x1b/0x60
[ 1184.795301] [<ffffffff81af1c81>] __device_release_driver+0x81/0xd0
[ 1184.795301] [<ffffffff81af257a>] device_release_driver+0x2a/0x40
[ 1184.795301] [<ffffffff81af0d48>] bus_remove_device+0x138/0x150
[ 1184.795301] [<ffffffff81aef08d>] device_del+0x14d/0x1b0
[ 1184.795301] [<ffffffff81aef138>] device_unregister+0x48/0x60
[ 1184.795301] [<ffffffff8193694d>] unregister_virtio_device+0xd/0x10
[ 1184.795301] [<ffffffff8265fc74>] virtio_pci_remove+0x2a/0x6c
[ 1184.795301] [<ffffffff818a95ad>] pci_device_remove+0x4d/0x110
[ 1184.795301] [<ffffffff81af1c81>] __device_release_driver+0x81/0xd0
[ 1184.795301] [<ffffffff81af257a>] device_release_driver+0x2a/0x40
[ 1184.795301] [<ffffffff81af0d48>] bus_remove_device+0x138/0x150
[ 1184.795301] [<ffffffff81aef08d>] device_del+0x14d/0x1b0
[ 1184.795301] [<ffffffff81aef138>] device_unregister+0x48/0x60
[ 1184.795301] [<ffffffff818a36fa>] pci_stop_bus_device+0x6a/0x90
[ 1184.795301] [<ffffffff818a3791>] pci_stop_and_remove_bus_device+0x11/0x20
[ 1184.795301] [<ffffffff818c21d9>] remove_callback+0x9/0x10
[ 1184.795301] [<ffffffff81252d91>] sysfs_schedule_callback_work+0x21/0x60
[ 1184.795301] [<ffffffff810cb1a1>] process_one_work+0x281/0x430
[ 1184.795301] [<ffffffff810cb140>] ? process_one_work+0x220/0x430
[ 1184.795301] [<ffffffff81252d70>] ? sysfs_read_file+0x1c0/0x1c0
[ 1184.795301] [<ffffffff810cc613>] worker_thread+0x1f3/0x320
[ 1184.795301] [<ffffffff810cc420>] ? manage_workers.clone.13+0x130/0x130
[ 1184.795301] [<ffffffff810d30b2>] kthread+0xb2/0xc0
[ 1184.795301] [<ffffffff826783f4>] kernel_thread_helper+0x4/0x10
[ 1184.795301] [<ffffffff810deb18>] ? finish_task_switch+0x78/0xf0
[ 1184.795301] [<ffffffff82676574>] ? retint_restore_args+0x13/0x13
[ 1184.795301] [<ffffffff810d3000>] ? kthread_flush_work_fn+0x10/0x10
[ 1184.795301] [<ffffffff826783f0>] ? gs_change+0x13/0x13
[ 1184.795301] Code: c1 9e 0a 00 48 83 c4 08 5b c9 c3 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 49 89 fc 53 48 8b 9f a8 04 00 00 80 3b 00 74 0a <0f> 0b 0f 1f 84 00 00 00 00 00 48 8b 87 88 04 00 00 ff 50 30 31
[ 1184.795301] RIP [<ffffffff825c9116>] p9_virtio_remove+0x16/0x90
[ 1184.795301] RSP <ffff88000d653ac0>
[ 1184.952618] ---[ end trace a307b3ed40206b4c ]---
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'net/9p/trans_virtio.c')
| -rw-r--r-- | net/9p/trans_virtio.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 3d432068f627..5af18d11b518 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -615,7 +615,8 @@ static void p9_virtio_remove(struct virtio_device *vdev) { struct virtio_chan *chan = vdev->priv; - BUG_ON(chan->inuse); + if (chan->inuse) + p9_virtio_close(chan->client); vdev->config->del_vqs(vdev); mutex_lock(&virtio_9p_lock); |