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SubjectMEI-related WARN_ON() triggered during resume-from-sleep on v4.12-rc2+
Thomas,

on Linus' most recent kernel (v4.12-rc2, git head 0a07b238e5f48), I see the
following message on my Dell XPS13 when resuming from sleep. MEI is, AFAIK,
not being used on this system:

[ 192.940537] Restarting tasks ...
[ 192.940610] PGI is not set
[ 192.940619] ------------[ cut here ]------------
[ 192.940623] WARNING: CPU: 0 PID: 1661 at /home/brodo/local/kernel/git/linux/drivers/misc/mei/hw-me.c:653 mei_me_pg_exit_sync+0x351/0x360
[ 192.940624] Modules linked in:
[ 192.940627] CPU: 0 PID: 1661 Comm: kworker/0:3 Not tainted 4.13.0-rc2+ #2
[ 192.940628] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A11 12/08/2016
[ 192.940630] Workqueue: pm pm_runtime_work
<snip>
[ 192.940642] Call Trace:
[ 192.940646] ? pci_pme_active+0x1de/0x1f0
[ 192.940649] ? pci_restore_standard_config+0x50/0x50
[ 192.940651] ? kfree+0x172/0x190
[ 192.940653] ? kfree+0x172/0x190
[ 192.940655] ? pci_restore_standard_config+0x50/0x50
[ 192.940663] mei_me_pm_runtime_resume+0x3f/0xc0
[ 192.940665] pci_pm_runtime_resume+0x7a/0xa0
[ 192.940667] __rpm_callback+0xb9/0x1e0
[ 192.940668] ? preempt_count_add+0x6d/0xc0
[ 192.940670] rpm_callback+0x24/0x90
[ 192.940672] ? pci_restore_standard_config+0x50/0x50
[ 192.940674] rpm_resume+0x4e8/0x800
[ 192.940676] pm_runtime_work+0x55/0xb0
[ 192.940678] process_one_work+0x184/0x3e0
[ 192.940680] worker_thread+0x4d/0x3a0
[ 192.940681] ? preempt_count_sub+0x9b/0x100
[ 192.940683] kthread+0x122/0x140
[ 192.940684] ? process_one_work+0x3e0/0x3e0
[ 192.940685] ? __kthread_create_on_node+0x1a0/0x1a0
[ 192.940688] ret_from_fork+0x27/0x40
[ 192.940690] Code: 96 3a 9e ff 48 8b 7d 98 e8 cd 21 58 00 83 bb bc 01 00 00 04 0f 85 40 fe ff ff e9 41 fe ff ff 48 c7 c7 5f 04 99 96 e8 93 6b 9f ff <0f> ff e9 5d fd ff ff e8 33 fe 99 ff 0f 1f 00 0f 1f 44 00 00 55
[ 192.940719] ---[ end trace a86955597774ead8 ]---
[ 192.942540] done.

This doesn't / didn't happen on v4.12.

Best,
Dominik
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