From: Oliver Neukum <oliver@neukum.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <James.Bottomley@steeleye.com>,
linux-usb-devel@lists.sourceforge.net,
linux-scsi@vger.kernel.org
Subject: Re: question on flushing buffers and spinning down disk
Date: Thu, 27 Sep 2007 20:12:14 +0200 [thread overview]
Message-ID: <200709272012.15567.oliver@neukum.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0709271159570.7735-100000@iolanthe.rowland.org>
Am Donnerstag 27 September 2007 schrieb Alan Stern:
> On Thu, 27 Sep 2007, Oliver Neukum wrote:
>
> > Am Dienstag 25 September 2007 schrieb Alan Stern:
> > > Getting all this to work will be tricky, because sd is a block device
> > > driven by requests issued through the block layer in atomic context,
> > > whereas suspend and resume require a process context. Probably the
> > > SCSI core would have to get involved in managing the synchronization.
> >
> >
> > Well,
> >
> > here's a patch that seems to do what needs to be done to make it work.
>
> Oliver, I'm surprised at you! This patch is a big hack, not to mention
> a layering violation and an inversion of the proper calling sequence.
Well,
1. autosuspend should not be specific to USB
2. I like to view the generic SCSI code as a library
3. The low level drivers will have to decide whether to suspend devices,
as the generic code doesn't know whether the bus is shared.
Regards
Oliver
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next prev parent reply other threads:[~2007-09-27 18:12 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-18 8:32 question on flushing buffers and spinning down disk Oliver Neukum
2007-09-18 14:01 ` James Bottomley
2007-09-18 14:15 ` Oliver Neukum
2007-09-18 14:26 ` James Bottomley
2007-09-24 10:33 ` Oliver Neukum
2007-09-24 14:38 ` Alan Stern
2007-09-24 15:21 ` Oliver Neukum
2007-09-24 15:34 ` Alan Stern
2007-09-24 16:47 ` Oliver Neukum
2007-09-24 17:10 ` Alan Stern
2007-09-24 19:16 ` [linux-usb-devel] " Oliver Neukum
2007-09-24 19:39 ` Alan Stern
2007-09-24 20:00 ` [linux-usb-devel] " Oliver Neukum
2007-09-25 14:13 ` Alan Stern
2007-09-25 15:11 ` Oliver Neukum
2007-09-28 4:27 ` Greg KH
2007-09-28 7:02 ` Oliver Neukum
2007-09-28 19:33 ` Greg KH
2007-09-25 7:50 ` Oliver Neukum
2007-09-25 15:03 ` Alan Stern
2007-09-27 11:40 ` Oliver Neukum
2007-09-27 16:01 ` Alan Stern
2007-09-27 18:12 ` Oliver Neukum [this message]
2007-09-27 19:07 ` Alan Stern
2007-09-27 19:26 ` Oliver Neukum
2007-09-27 20:26 ` Alan Stern
2007-09-27 20:54 ` Steve Calfee
2007-09-27 21:16 ` Alan Stern
2007-09-27 21:37 ` U. George
2007-09-28 8:17 ` [linux-usb-devel] " Oliver Neukum
2007-09-28 15:01 ` Alan Stern
2007-09-28 8:22 ` [linux-usb-devel] " Oliver Neukum
2007-09-28 21:11 ` Alan Stern
2007-09-28 21:47 ` Oliver Neukum
2007-09-29 15:56 ` Alan Stern
2007-09-29 16:12 ` [linux-usb-devel] " Oliver Neukum
2007-09-28 9:04 ` Oliver Neukum
2007-09-28 15:07 ` Alan Stern
2007-09-28 21:33 ` [linux-usb-devel] " Oliver Neukum
2007-09-29 16:38 ` Alan Stern
2007-09-29 17:52 ` Oliver Neukum
2007-09-29 19:06 ` Alan Stern
2007-09-29 20:06 ` Oliver Neukum
2007-09-29 20:56 ` Alan Stern
2007-09-29 21:03 ` David Brownell
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