linux-kernel - Re: [PATCH] ACPI: Do not fail acpi_bind_one() if device is already bound correctly

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Message-ID: <1375576322.10300.146.camel@misato.fc.hp.com>
Date:	Sat, 03 Aug 2013 18:32:02 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] ACPI: Do not fail acpi_bind_one() if device is already
 bound correctly

On Sat, 2013-08-03 at 02:47 +0200, Rafael J. Wysocki wrote:
> On Friday, August 02, 2013 04:38:38 PM Toshi Kani wrote:
> > On Fri, 2013-08-02 at 00:33 +0200, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > 
> > > Modify acpi_bind_one() so that it doesn't fail if the device
> > > represented by its first argument has already been bound to the
> > > given ACPI handle (second argument), because that is not a good
> > > enough reason for returning an error code.
> > 
> > While it seems reasonable to allow such case, I do not think we will hit
> > this case under the normal scenarios.  So, I do not think we need to
> > make this change now unless it actually solves Yasuaki's issue (which I
> > am guessing not).
> 
> In theory it should be possible to call acpi_bind_one() twice in a row
> for the same dev and the same handle without failure, that simply is
> logical.  The patch may not fix any problems visible now, but returning an
> error code in such a case is simply incorrect.

We changed acpi_bus_device_attach() to not call the handler or driver
again if it is already bound.  So, I was under impression that we
prevent from attaching a same device twice.  But I may be missing
something...

Thanks,
-Toshi


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