linux-kernel - Re: [PATCH] PCMCIA: prevent auto insert during resume.

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Date:	Fri, 26 Oct 2007 17:36:51 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Rodolfo Giometti <giometti@...eenne.com>
Cc:	linux-pcmcia@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCMCIA: prevent auto insert during resume.

On Fri, Oct 26, 2007 at 06:27:06PM +0200, Rodolfo Giometti wrote:
> On Fri, Oct 26, 2007 at 05:02:06PM +0100, Russell King wrote:
> > When you bring the battery device out of resume, and you've inserted a
> > card, you want it to be detected.  Your change means you have to wait
> > until the system has finished resuming before you plug the card in,
> > which practically is a pain in the butt and actually leads to user
> > errors.  IOW:
> > 
> > "I plugged my wireless card in after I pressed the power button, why
> > wasn't it detected?"
> 
> My patch doesn't affect the power on sequence, just the resume
> one.

On a lot of devices, the "power button" is the resume button.  When you
"turn it off" it suspends, and when you "turn it on" it resumes.

> Also if you didn't eject the socket, at resume the device will be
> powered up again, my patch just prevents that a pre-powered off device
> to be turned on at resume time.
> 
> However you should consider that some embedded systems have fixed
> PCMCIA devices that can't be removed so there are no reasons to detect
> them after resume, nobody can change them. :)
> 
> Also battery powered devices can go very frequently to sleep and the
> current behavior force the user to switch off the unused device each
> time the system resumes from sleep.

I realise that.  I do work on embedded devices, and this behaviour is
explicitly there to support embedded devices.

I've suggested a workable solution to you which allows both of us to
have the behaviour we both desire from the system.  That sounds like
a negotiated solution to me...

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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