From: James Bottomley <James.Bottomley@SteelEye.com>
To: Oliver Neukum <oliver@neukum.org>
Cc: linux-scsi@vger.kernel.org
Subject: Re: question on flushing buffers and spinning down disk
Date: Tue, 18 Sep 2007 09:26:06 -0500 [thread overview]
Message-ID: <1190125566.3375.9.camel@localhost.localdomain> (raw)
In-Reply-To: <200709181615.46537.oliver@neukum.org>
On Tue, 2007-09-18 at 16:15 +0200, Oliver Neukum wrote:
> Am Dienstag 18 September 2007 schrieb James Bottomley:
> > On Tue, 2007-09-18 at 10:32 +0200, Oliver Neukum wrote:
> > > which function should a lldd call to make the scsi layer flush
> > > a device's buffers and spin it down? Which kind of locking is
> > > required?
> >
> > Depends on the context. Is this for suspend? If so it's done
> > automatically by the sd driver, but the device has to be marked for it
> > in the manage_start_stop attributes.
>
> It is for runtime power management. We've gotten a bug report about
> a drive enclosure that doesn't properly park heads if the usb device is
> simply suspended. Apparently it simply cuts power so the cache can
> be lost, too.
But even for runtime, if you want to suspend the device, shouldn't you
be calling the suspend methods in the device tree?
James
next prev parent reply other threads:[~2007-09-18 14:26 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 [this message]
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
2007-09-27 19:07 ` [linux-usb-devel] " 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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