From: Oliver Neukum <oneukum-l3A5Bk7waGM@public.gmane.org>
To: Ming Lei <ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
Cc: "David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
Greg Kroah-Hartman
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Alan Stern
<stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
Subject: Re: [PATCH 01/12] usbnet: introduce usbnet 3 command helpers
Date: Thu, 11 Oct 2012 06:11:58 +0200 [thread overview]
Message-ID: <1588459.VLxBbnNMlP@linux-lqwf.site> (raw)
In-Reply-To: <CACVXFVMynoPm6_wYj2MD-5SvMpB7e1Wk94=XMp588rD8hU=eew-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Thursday 11 October 2012 11:18:22 Ming Lei wrote:
> On Wed, Oct 10, 2012 at 1:51 PM, Oliver Neukum <oneukum-l3A5Bk7waGM@public.gmane.org> wrote:
> >
> > No, the problem is autoresume.
> >
> > Suppose we have a device with two interface. Interface A be usbnet; interface B
> > something you page on. Now consider that you can only resume both interfaces
> > and this is (and needs to be) done synchronously.
> >
> > Now we can have this code path:
> >
> > autoresume of device -> resume() -> kmalloc(..., GFP_KERNEL) ->
> > VM layer decides to start paging out -> IO to interface B -> autoresume of device
> > --> DEADLOCK
>
> Currently scsi disk can only be runtime suspended when the device is not
> opened, so are you sure that the paging out above can cause IO on a suspend
> usb mass storage disk which is not mounted or opened by utility now?
We definitely do not wish to keep it that way. People at Intel are currently working
on better power management for sd, which would allow full autosuspend.
Regards
Oliver
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next prev parent reply other threads:[~2012-10-11 4:11 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-02 6:51 [PATCH 00/12] usbnet: usb_control_msg cleanup Ming Lei
2012-10-02 6:51 ` [PATCH 03/12] usbnet: cdc-ncm: apply introduced usb command APIs Ming Lei
2012-10-02 6:51 ` [PATCH 04/12] usbnet: dm9601: " Ming Lei
2012-10-02 6:51 ` [PATCH 05/12] usbnet: int51x1: " Ming Lei
2012-10-02 6:51 ` [PATCH 06/12] usbnet: mcs7830: " Ming Lei
[not found] ` <1349160684-6627-1-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2012-10-02 6:51 ` [PATCH 01/12] usbnet: introduce usbnet 3 command helpers Ming Lei
2012-10-09 8:47 ` Oliver Neukum
2012-10-10 3:19 ` Ming Lei
[not found] ` <CACVXFVOPc0gG3UdWqJ0E+6wiwdPv5EoEgbJ0cvJ4oD4602Yp3A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-10 5:51 ` Oliver Neukum
[not found] ` <4085386.s0fOKMaRDP-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-10 8:17 ` Ming Lei
[not found] ` <CACVXFVM7wPLXy0JL7QDnCaZFidwucTFf3t_38DuwukxWtOESHQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-10 8:39 ` Oliver Neukum
[not found] ` <1631246.gHVDWoZpLi-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-10 9:48 ` Ming Lei
2012-10-10 10:08 ` Oliver Neukum
2012-10-10 11:02 ` Ming Lei
[not found] ` <CACVXFVPDg89y7LyKLA0YUN7oA2rGfptfHLZhJrqBjTVPjsGdNg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-10 11:25 ` David Laight
[not found] ` <AE90C24D6B3A694183C094C60CF0A2F6026B702F-CgBM+Bx2aUAnGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2012-10-10 11:39 ` Oliver Neukum
2012-10-10 11:45 ` Ming Lei
2012-10-11 3:18 ` Ming Lei
[not found] ` <CACVXFVMynoPm6_wYj2MD-5SvMpB7e1Wk94=XMp588rD8hU=eew-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-11 4:11 ` Oliver Neukum [this message]
2012-10-11 8:14 ` Ming Lei
[not found] ` <CACVXFVPjx+053r_-QB=8kPCDmk3va3feN9MYdLgpf=eRWGe05A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-11 9:05 ` Oliver Neukum
[not found] ` <1940520.W6hRn23j86-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-11 11:29 ` Ming Lei
[not found] ` <1588459.VLxBbnNMlP-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-11 14:36 ` Alan Stern
2012-10-12 1:43 ` Ming Lei
[not found] ` <CACVXFVPdOkvKBBrshnmQv5cYVdDhi8j0V_WxNwBU9VuDsCLkXA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-12 15:18 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210111030570.1170-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-12 13:51 ` Oliver Neukum
2012-10-12 15:17 ` Ming Lei
[not found] ` <CACVXFVOChR3ZJSyjo44AMwzzjx5URWvEe25KY2eV5evJpF9D+g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-12 15:33 ` Ming Lei
[not found] ` <3535515.7NRjKhCcrL-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-12 15:29 ` Alan Stern
2012-10-15 10:04 ` Oliver Neukum
[not found] ` <15188898.QK0YCDZ0MW-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-15 14:27 ` Alan Stern
2012-10-10 5:56 ` Ming Lei
[not found] ` <CACVXFVM7CrxXPYzr+dfWhbbmbF+3sXq4C1q2OauvP6x_jebbYQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-10 8:24 ` Oliver Neukum
2012-10-02 6:51 ` [PATCH 02/12] usbnet: asix: apply introduced usb command APIs Ming Lei
2012-10-02 6:51 ` [PATCH 07/12] usbnet: net1080: " Ming Lei
2012-10-02 6:51 ` [PATCH 08/12] usbnet: plusb: " Ming Lei
2012-10-02 6:51 ` [PATCH 11/12] usbnet: smsc95xx: " Ming Lei
2012-10-09 8:42 ` [PATCH 00/12] usbnet: usb_control_msg cleanup Oliver Neukum
2012-10-02 6:51 ` [PATCH 09/12] usbnet: sierra_net: apply introduced usb command APIs Ming Lei
2012-10-02 6:51 ` [PATCH 10/12] usbnet: smsc75xx: " Ming Lei
2012-10-02 6:51 ` [PATCH 12/12] usbnet: make device out of suspend before calling usbnet_read/write_cmd Ming Lei
2012-10-09 8:50 ` Oliver Neukum
[not found] ` <2913414.gCAxlQ38lG-ugxBuEnWX9yG/4A2pS7c2Q@public.gmane.org>
2012-10-10 2:33 ` Ming Lei
[not found] ` <CACVXFVNb-APsJG=ejW+2jqxTfAFsGhHovpgpsyvk6wUoKn5TzA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-10 5:34 ` Oliver Neukum
2012-10-10 6:00 ` Ming Lei
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