linux-kernel - Re: 2.6.35.4: sudo rmmod ahci @ 2.6.35.4 succeeds: filesystem access errors follow

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Message-Id: <201009082049.54128.pedrogfrancisco@gmail.com>
Date:	Wed, 8 Sep 2010 20:49:53 +0100
From:	Pedro Francisco <pedrogfrancisco@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Alejandro Riveira Fernández 
	<ariveira@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.35.4: sudo rmmod ahci @ 2.6.35.4 succeeds: filesystem access errors follow

On Wednesday 08 September 2010 19:28:57 Stefan Richter wrote:
> Pedro Francisco wrote:
> > That makes no sense. That's what the force option "-f" is for. It's my
> > opinion the usage count for ahci on `lsmod' should be 1 and not 0.
> > Whoever still wants to remove it can use the `rmmod -f ahci'
> 
> The usage count of a module is only there to ensure that function calls
> into the module succeed.  As long as some other part of the kernel has a
> pointer of a function in the module, removal of the module needs to be
> prevented.
> 
> "rmmod ahci" on the other hand is something like pulling the SATA cable. 
> Or ejection of the controller from an ExpressCard slot.  The driver
> shutdown causes the controller device and thus its child devices (disk
> devices behind the controller) to go away, and that's it.  You can do also
> # echo $DEVICE_ID > /sys/module/ahci/drivers/pci\:ahci/unbind
> which tells the driver to let go of the controller.

Hum ok... Still I find it weird since on 2.6.32 I've, after `lsmod | grep -i 
ahci':
ahci                   32200  4
and on 2.6.35.4:
ahci                   32200  0

Why the change of behaviour? Is it because of the split of libahci from ahci ?

-- 
Pedro
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