linux-kernel - Re: [PATCH v9 4/4] sd: change to auto suspend mode

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Message-ID: <Pine.LNX.4.44L0.1302061048180.1893-100000@iolanthe.rowland.org>
Date:	Wed, 6 Feb 2013 10:51:19 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Aaron Lu <aaron.lu@...el.com>
cc:	Jens Axboe <axboe@...nel.dk>, "Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	<linux-pm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	Aaron Lu <aaron.lwe@...il.com>,
	Shane Huang <shane.huang@....com>
Subject: Re: [PATCH v9 4/4] sd: change to auto suspend mode

On Wed, 6 Feb 2013, Aaron Lu wrote:

> > The "if (err == -EAGAIN)" test and the call to pm_schedule_suspend seem
> > to have been dropped since v8 of this series.  It looks like they ought
> > to be moved into sdev_runtime_suspend.
> 
> I thought they were no longer needed...

You did not mention this in the patch description.

> For sd, we have request based rutime PM and the PM core will always try
> to autosuspend the device with the timer; and for sr, the poll will
> trigger suspend constantly.

What if the poll has been disabled?

> And for both, we don't return -EAGAIN anyway.
> So I suppose that code is not necessary?

You could replace it with WARN_ON(err == -EAGAIN).  That way if some 
SCSI driver does return -EAGAIN in the future, people will know 
something is wrong.

> BTW, I'll be on vocation till 02/17, and I don't have access to the
> internet in my hometown, but please feel free to drop any comments and
> I'll check them when I get back.

I'm going on vacation next week too.  Enjoy your trip.

Alan Stern

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