Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio()

[Oliver Neukum]

On Wednesday 31 October 2012 11:05:33 Ming Lei wrote:
> On Wed, Oct 31, 2012 at 10:08 AM, Ming Lei <ming.lei@xxxxxxxxxxxxx> wrote:
> >> I am afraid it is, because a disk may just have been probed as the deviceis being reset.
> >
> > Yes, it is probable, and sounds like similar with 'root_wait' problem, see
> > prepare_namespace(): init/do_mounts.c, so looks no good solution
> > for the problem, and maybe we have to set the flag always before resetting
> > usb device.
> 
> The below idea may help the problem which 'memalloc_noio' flag isn't set during
> usb_reset_device().
> 
> - for usb mass storage device, call pm_runtime_set_memalloc_noio(true)
>   inside usb_stor_probe2() and uas_probe(), and call
>   pm_runtime_set_memalloc_noio(false) inside uas_disconnect()
>   and usb_stor_disconnect().
> 
> - for usb network device, register_netdev() is always called inside usb
>   interface's probe(),  looks no such problem.

This still leaves networking done over PPP in the cold.

	Regards
		Oliver

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