linux-kernel - RE: [linuxppc-dev] Unbinding device from a driver

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Message-ID: <B2B5EF0D8FDD10429C8DE6C4C2B38282093D613B@039-SN2MPN1-021.039d.mgd.msft.net>
Date:	Tue, 9 Jul 2013 04:47:20 +0000
From:	Gupta Ruchika-R66431 <R66431@...escale.com>
To:	Wood Scott-B07421 <B07421@...escale.com>
CC:	"linuxppc-dev@...ux.freescale.net" <linuxppc-dev@...ux.freescale.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [linuxppc-dev] Unbinding device from a driver

> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, July 09, 2013 5:04 AM
> To: Gupta Ruchika-R66431
> Cc: linuxppc-dev@...ux.freescale.net; linux-kernel@...r.kernel.org
> Subject: Re: [linuxppc-dev] Unbinding device from a driver
> 
> On 07/04/2013 05:35:28 AM, Gupta Ruchika-R66431 wrote:
> > Hi,
> >
> >
> >
> > I am trying to unbind a platform device from a driver. Even when the
> > remove function of the device returns an EBUSY error, the device is
> > unbound from the driver. Is this the right behavior ? Why does kernel
> > forcefully unbind the device even if device remove function returns an
> > error ?
> 
>  From looking at the code, it seems it's not allowed for a driver to refuse
> the unbinding.  If you can't unbind yet, you need to block until you can
> (and take measures to ensure that it won't take too long).
> 
> I don't know the history of why the remove method can return an error even
> though nothing seems to check it.
> 
> > root@...80ds: ls
> >
> > bind  ffe301000.jr  ffe302000.jr  ffe303000.jr  ffe304000.jr  uevent
> > unbind
> >
> >
> >
> > root@...80ds: echo ffe301000.jr > unbind
> >
> > In caam_jr_remove
> >
> > caam_jr ffe301000.jr: Device Busy
> 
> Is the caam_jr driver printing this, or the device model infrastructure?
This is being printed by jr driver.

Ruchika
> 
> -Scott

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