linux-kernel - [PATCH] USB: power-management.txt

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Message-Id: <20071112095535.B778111004B@xenon.ts.pxnet.com>
Date:	Mon, 12 Nov 2007 10:55:35 +0100 (CET)
From:	Tilman Schmidt <tilman@...p.cc>
To:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] USB: power-management.txt - disconnect clarification

From: Tilman Schmidt <tilman@...p.cc>

Add a paragraph to Documentation/usb/power-management.txt about the
interaction between suspend and disconnect.

Signed-off-by: Tilman Schmidt <tilman@...p.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.
+
 The reset_resume method is used by the USB Persist facility (see
 Documentation/usb/persist.txt) and it can also be used under certain
 circumstances when CONFIG_USB_PERSIST is not enabled.  Currently, if a
-
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