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

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Date:	Wed, 31 Oct 2012 10:08:40 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Oliver Neukum <oneukum@...e.de>
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 Wed, Oct 31, 2012 at 12:30 AM, Oliver Neukum <oneukum@...e.de> wrote:
>> If the USB mass-storage device is being reseted, the flag should be set
>> already generally.  If the flag is still unset, that means the disk/network
>> device isn't added into system(or removed just now), so memory allocation
>> with block I/O should be allowed during the reset. Looks it isn't one problem,
>> isn't it?
>
> 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.


Thanks,
--
Ming Lei
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