From: Ming Lei <ming.lei@canonical.com>
To: Oliver Neukum <oneukum@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>,
linux-kernel@vger.kernel.org, Minchan Kim <minchan@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Jens Axboe <axboe@kernel.dk>,
"David S. Miller" <davem@davemloft.net>,
Andrew Morton <akpm@linux-foundation.org>,
netdev@vger.kernel.org, linux-usb@vger.kernel.org,
linux-pm@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio()
Date: Wed, 31 Oct 2012 11:05:33 +0800 [thread overview]
Message-ID: <CACVXFVNxucCVLS-=EQkmVop3LQMkeXW7RbZq4yfkiq_MUGndvg@mail.gmail.com> (raw)
In-Reply-To: <CACVXFVMRJPfPSC_4ZamqfYUSYNsMEVYXMFmcs26T=4MdB_Kntw@mail.gmail.com>
On Wed, Oct 31, 2012 at 10:08 AM, Ming Lei <ming.lei@canonical.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.
Thanks,
--
Ming Lei
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next prev parent reply other threads:[~2012-10-31 3:05 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-29 12:23 [PATCH v3 0/6] solve deadlock caused by memory allocation with I/O Ming Lei
2012-10-29 12:23 ` [PATCH v3 1/6] mm: teach mm by current context info to not do I/O during memory allocation Ming Lei
2012-10-29 12:23 ` [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio() Ming Lei
2012-10-29 15:41 ` Alan Stern
2012-10-30 3:21 ` Ming Lei
2012-10-30 10:57 ` Oliver Neukum
2012-10-30 11:30 ` Ming Lei
2012-10-30 15:38 ` Alan Stern
2012-10-30 16:00 ` Ming Lei
2012-10-30 16:15 ` Ming Lei
2012-10-30 16:30 ` Oliver Neukum
2012-10-31 2:08 ` Ming Lei
2012-10-31 3:05 ` Ming Lei [this message]
2012-10-31 8:37 ` Oliver Neukum
2012-10-31 15:20 ` Alan Stern
2012-10-31 15:41 ` Alan Stern
2012-10-31 23:18 ` Ming Lei
2012-10-30 16:54 ` Alan Stern
2012-10-29 12:23 ` [PATCH v3 3/6] block/genhd.c: apply pm_runtime_set_memalloc_noio on block devices Ming Lei
2012-10-29 12:23 ` [PATCH v3 4/6] net/core: apply pm_runtime_set_memalloc_noio on network devices Ming Lei
2012-10-29 15:44 ` Alan Stern
2012-10-29 12:23 ` [PATCH v3 5/6] PM / Runtime: force memory allocation with no I/O during runtime_resume callbcack Ming Lei
2012-10-29 12:24 ` [PATCH v3 6/6] USB: forbid memory allocation with I/O during bus reset Ming Lei
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