linux-kernel - Re: USB: on suspend to ram/disk all usb devices are replugged

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Message-ID: <Pine.LNX.4.44L0.0703291155000.3108-100000@iolanthe.rowland.org>
Date:	Thu, 29 Mar 2007 11:56:41 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Mark Lord <lkml@....ca>
cc:	Maxim Levitsky <maximlevitsky@...il.com>,
	<linux-kernel@...r.kernel.org>, <gregkh@...e.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: USB: on suspend to ram/disk all usb devices are replugged

On Thu, 29 Mar 2007, Mark Lord wrote:

> Maxim Levitsky wrote:
> > Hi,
> > 	I noticed that after suspend/resume cycle all my usb devices are unplugged/replugged by uhci driver.
> > While it is not that big problem to me, that can be a real problem if a device is a flash card with mounted 
> > file-system, because disappeared device will cause file-system corruption.
> 
> Mmm.. this sounds really bad -- I wonder what happens if the rootfs is on USB ?

The system crashes as soon as it resumes.  As you might expect.

> With older kernels, things just "worked" this way.  Has it now been broken ??

No; it has never worked.  Your memory of how older kernels behaved is 
wrong.

Alan Stern

P.S.: Help is on the way.  I will soon submit a patch to help improve the 
situation.

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