linux-kernel - Re: Reference counting of MMC host driver modules

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Message-ID: <20090109200024.GA14754@ngeserver2.localdomain>
Date:	Fri, 9 Jan 2009 21:00:24 +0100
From:	Enrik Berkhan <Enrik.Berkhan@...com>
To:	David Vrabel <david.vrabel@....com>
Cc:	Pierre Ossman <drzeus-mmc@...eus.cx>, linux-kernel@...r.kernel.org
Subject: Re: Reference counting of MMC host driver modules

On Fri, Jan 09, 2009 at 06:20:32PM +0000, David Vrabel wrote:
> Enrik Berkhan wrote:
> > I've noticed recently that the MMC/SD block driver does not reference 
> > count the MMC/SD host driver module that it uses via the MMC/SD core 
> > layer. Thus, I can rmmod my host driver module while, for example, a 
> > partition on a SD card is mounted.
> 
> This is same as removing the card while it's in use.

I don't think so.

Being able to remove the card while it is in use is a bug of the
mechanical interface. Can't be fixed easily.

Being able to remove the module while it is in use is a bug of the
software. Can be fixed.

Enrik
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