linux-kernel - [char-misc for 4.19 0/2] mei: fix suspend/hibernation regression

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Message-Id: <20180827194016.1287-1-tomas.winkler@intel.com>
Date:   Mon, 27 Aug 2018 22:40:14 +0300
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc for 4.19 0/2] mei: fix suspend/hibernation regression

A kernel panic during suspend/hibernation was reported on kernel 4.17.

RIP:  mei_cl_set_disconnected+0x5/0x260[mei]
Call trace:
mei_cl_all_disconnect+0x22/0x30
mei_reset+0x194/0x250
__synchronize_hardirq+0x43/0x50
_cond_resched+0x15/0x30
mei_me_intr_clear+0x20/0x100
mei_stop+0x76/0xb0
mei_me_shutdown+0x3f/0x80
pci_device_shutdown+0x34/0x60
kernel_restart+0x0e/0x30

Bugzilla entries:
https://bugzilla.redhat.com/show_bug.cgi?id=1597481
https://bugzilla.kernel.org/show_bug.cgi?id=200455

The regression is caused by a combination of two coding errors
in two separate patches. In addition, this currently only happens
on platforms with AMT watchdog enabled that systemd holds.

Both patches bellow should be applied.

Tomas Winkler (2):
  mei: bus: fix hw module get/put balance
  mei: bus: need to unlink client before freeing

 drivers/misc/mei/bus.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

-- 
2.14.4