[replaced 'netdev' with 'linux-usb' as this concerns a USB serial driver only]
Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> writes:
> 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
Isn't the device unregistered? What else can be done here?
Bjørn
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