From: "Jordan Crouse" <jordan.crouse@amd.com>
To: "Rodolfo Giometti" <giometti@linux.it>
Cc: linux-mips@linux-mips.org
Subject: Re: USB sleep & mount
Date: Tue, 23 May 2006 09:11:13 -0600 [thread overview]
Message-ID: <20060523151113.GK18042@cosmic.amd.com> (raw)
In-Reply-To: <20060523132418.GA28124@enneenne.com>
On 23/05/06 15:24 +0200, Rodolfo Giometti wrote:
> Hello,
>
> When I put the system to sleep and then it wakes up everything works
> well _if_ the USB key is not mounted before the sleep. For instance,
> if I mount partition "/dev/sda1" (first USB key partition) and then go
> to sleep, at wake up the system forgets device "/dev/sda" and
> registers a new device "/dev/sdb" so, obviously, the filesystem
> previously mounted is not accessible anymore.
Thats exactly right - USB sleep is a very delicate and broken procedure.
Basically, the controller seems to be giving up and re-enumerating
everything.
> My question is: is that correct since the userland, before going to
> sleep, should umount all external filesystems or it's a bug? :)
The userland technically *shouldn't* have to unmount the filesystems, but
its the safest option we have - between enumeration issues, and the age
old problem of unplugging the external device while in sleep - its just
better to unmount the device before heading for nap time (or mount the
thing with '-a' so data isn't lost).
Is that ideal? Of course not - but welcome to the wonderful world of
USB in Linux.
Jordan
prev parent reply other threads:[~2006-05-23 15:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-23 13:24 USB sleep & mount Rodolfo Giometti
2006-05-23 15:11 ` Jordan Crouse [this message]
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