netdev - option driver crashes on modem removal

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Date:	Tue, 11 Aug 2015 11:32:20 +0200
From:	Yegor Yefremov <yegorslists@...glemail.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	Aleksander Morgado <aleksander@...ksander.es>,
	Dan Williams <dcbw@...hat.com>,
	Bjørn Mork <bjorn@...k.no>
Subject: option driver crashes on modem removal

I have following problem. When removing USB dongle 07d1:3e01 or
SierraWireless MC7304 I get following messages:

option1 ttyUSB10: option_instat_callback: error -71
option1 ttyUSB9: option_instat_callback: error -71
option1 ttyUSB10: option_instat_callback: error -71
option1 ttyUSB9: option_instat_callback: error -71
option1 ttyUSB10: option_instat_callback: error -71
option1 ttyUSB9: option_instat_callback: error -71
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 0,
t=2102 jiffies, g=694, c=693, q=24)
INFO: Stall ended before state dump start
option1 ttyUSB10: option_instat_callback: error -71

drivers/usb/serial/option.c seems to make nothing with such a status
and just prints error. How one would handle this properly and just
unregister device? Do you need more info?

Tested kernels: 3.18.20 and 4.2.0-rc5 (this kernel shows only RCU stall crash)
Hardware: TI am335x

Regards,
Yegor
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