From: Cornelia Huck <cornelia.huck@de.ibm.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Marcel Holtmann <marcel@holtmann.org>,
Linux-pm mailing list <linux-pm@lists.linux-foundation.org>
Subject: Re: Possible problem with device_move()
Date: Tue, 31 Jul 2007 10:33:05 +0200 [thread overview]
Message-ID: <20070731103305.39b76a5d@gondolin.boeblingen.de.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0707301330040.9339-100000@iolanthe.rowland.org>
On Mon, 30 Jul 2007 13:34:35 -0400 (EDT),
Alan Stern <stern@rowland.harvard.edu> wrote:
> As long as you never hold the device semaphores of both the parent and
> the child there shouldn't be any problem. Could this happen when a
> subchannel structure is deallocated?
This is indeed what happens, since we unregister the child ccw_device
from the (io_)subchannel's remove function.
(We used to do unregistering of the ccw_device via a workqueue (in
order to avoid livelocks on a no longer existing bus semaphore), but
removed it since it seemed to be needlessly complicated code.)
next prev parent reply other threads:[~2007-07-31 8:33 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-28 15:36 Possible problem with device_move() Alan Stern
2007-07-30 6:42 ` Cornelia Huck
2007-07-30 17:34 ` Alan Stern
2007-07-31 8:33 ` Cornelia Huck [this message]
2007-07-31 15:11 ` Alan Stern
2007-07-31 15:27 ` Rafael J. Wysocki
2007-07-31 15:30 ` Cornelia Huck
2007-07-31 18:17 ` Alan Stern
2007-07-31 19:12 ` Rafael J. Wysocki
2007-07-31 20:37 ` Alan Stern
2007-08-01 13:03 ` Cornelia Huck
2007-08-01 15:22 ` Alan Stern
2007-08-01 17:04 ` Cornelia Huck
2007-08-01 17:35 ` Alan Stern
2007-08-01 19:25 ` Rafael J. Wysocki
2007-08-01 20:27 ` Alan Stern
2007-08-02 8:06 ` Cornelia Huck
2007-08-02 14:19 ` Alan Stern
2007-08-02 14:50 ` Cornelia Huck
2007-08-02 11:21 ` Rafael J. Wysocki
2007-08-02 14:24 ` Alan Stern
2007-08-02 14:58 ` Rafael J. Wysocki
2007-08-02 15:23 ` Alan Stern
2007-08-02 22:39 ` Rafael J. Wysocki
2007-08-03 14:56 ` Alan Stern
2007-08-03 21:39 ` Rafael J. Wysocki
2007-08-06 9:31 ` Cornelia Huck
2007-08-06 13:53 ` Alan Stern
2007-07-30 6:53 ` Marcel Holtmann
2007-07-30 17:37 ` Alan Stern
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