Messages in this thread | | | Date | Mon, 12 Nov 2007 14:42:19 -0500 (EST) | From | Alan Stern <> | Subject | Re: [PATCH] USB: power-management.txt - disconnect clarification |
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On Mon, 12 Nov 2007, Tilman Schmidt wrote:
> From: Tilman Schmidt <tilman@imap.cc> > > Add a paragraph to Documentation/usb/power-management.txt about the > interaction between suspend and disconnect. > > Signed-off-by: Tilman Schmidt <tilman@imap.cc> > --- > > --- linux-2.6/Documentation/usb/power-management.txt 2007-10-14 00:41:08.000000000 +0200 > +++ linux-2.6.24-rc2-work/Documentation/usb/power-management.txt 2007-11-12 10:27:30.000000000 +0100 > @@ -278,6 +278,12 @@ > (although the interfaces will be in the same altsettings as > before the suspend). > > +If the device is disconnected or powered down while it is suspended, > +the disconnect method will be called instead of the resume or > +reset_resume method. This will also happen if the system is resumed > +from hibernation, as the device could have been disconnected without > +the system being able to detect it. > +
I don't like the second sentence very much. How about something like this instead:
+If the device is disconnected or powered down while it is suspended, +the disconnect method will be called instead of the resume or +reset_resume method. This is also quite likely to happen when +waking up from hibernation, as many systems do not maintain suspend +current to the USB host controllers during hibernation. (It's +possible to work around the hibernation-forces-disconnect problem by +using the USB-Persist facility, described in +Documentation/usb/persist.txt.)
Alan Stern
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