linux-kernel - Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc

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Message-ID: <1478330.G3nm4yCX9h@linux-lqwf.site>
Date:	Wed, 31 Oct 2012 09:37:16 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Jens Axboe <axboe@...nel.dk>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio()

On Wednesday 31 October 2012 11:05:33 Ming Lei wrote:
> On Wed, Oct 31, 2012 at 10:08 AM, Ming Lei <ming.lei@...onical.com> 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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