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

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Message-ID: <20071026160206.GC4321@flint.arm.linux.org.uk>
Date:	Fri, 26 Oct 2007 17:02:06 +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 05:47:06PM +0200, Rodolfo Giometti wrote:
> On Fri, Oct 26, 2007 at 04:11:41PM +0100, Russell King wrote:
> > On Fri, Oct 26, 2007 at 12:51:25PM +0200, Rodolfo Giometti wrote:
> > > If a socket has been ejected before sleeping, at resume time it
> > > shouldn't be awaked.
> > 
> > Conversely, if a card has been inserted into an empty slot prior to
> > resuming, it should be detected.  Removing this check prevents that
> > happening, which sucks for at least embedded devices.
> 
> You can use "pccardctl insert" to do it. :)

Not on a battery powered device with a graphical interface.

> On battery powered device I should prevent power lost, so if I power
> down a device I'd like it should remain off even after resume.

In which case you need to remember why it was powered down and act
accordingly.

> Why the system should power it on automagically? Just for detection?

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?"

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