linux-kernel - Re: [PATCH v3 7/7] [SCSI] sr: adds Zero-power ODD support

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Message-ID: <Pine.LNX.4.44L0.1204051000450.1361-100000@iolanthe.rowland.org>
Date:	Thu, 5 Apr 2012 10:03:05 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Aaron Lu <aaron.lu@....com>
cc:	Lin Ming <ming.m.lin@...el.com>, Zhang Rui <rui.zhang@...el.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	<linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v3 7/7] [SCSI] sr: adds Zero-power ODD support

On Thu, 5 Apr 2012, Aaron Lu wrote:

> Hi,
> 
> On Thu, Apr 05, 2012 at 02:00:57PM +0800, Lin Ming wrote:
> > >
> > > Another thing to consider is, user might want to eject the tray by
> > > software like the
> > > eject /dev/sr0 command or some UI mouse clicks against the cdrom icon. I'm still
> > > thinking how to do this correctly.
> > 
> > Assume eject /dev/sr0 is implemented as:
> > 
> > int fd = open("/dev/sr0", ...)
> > ioctl(fd, CDROMEJECT)
> > 
> 
> Indeed, it is implemented as this :-)
> 
> > We may need to resume ODD in the ioctl handler(scsi_cmd_ioctl).
> > 
> 
> I prefer we do this in sr_block_ioctl.
> Suppose the ODD is now runtime suspended and received an ioctl:
> if the ioctl's cmd is CDROMEJECT, resume it.
> For other cases, return an error code like EPERM.
> When done, according to the result of ioctl: if success, leave it resumed;
> if failed, put it back to sleep.

Alternatively, you may want to do the runtime resume in sr_open and 
sr_block_open and the suspend in the corresponding release routines.  
It's up to you.

Alan Stern

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