linux-kernel - Re: [PATCH 01/02] ACPI: sysfs eject support for ACPI scan handlers

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Date:	Thu, 07 Feb 2013 18:10:13 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc:	rjw@...k.pl, linux-acpi@...r.kernel.org,
	gregkh@...uxfoundation.org, bhelgaas@...gle.com,
	mika.westerberg@...ux.intel.com, matthew.garrett@...ula.com,
	yinghai@...nel.org, liuj97@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/02] ACPI: sysfs eject support for ACPI scan handlers

On Fri, 2013-02-08 at 09:50 +0900, Yasuaki Ishimatsu wrote:
> Hi Toshi,
> 
> 2013/02/07 7:50, Toshi Kani wrote:
> > Changed sysfs eject, acpi_eject_store(), to support ACPI scan handlers.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > ---
> >   drivers/acpi/scan.c |    2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > index cfd7a69..3ff632e 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -203,7 +203,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
> >   		return -EINVAL;
> >   	}
> >   #ifndef FORCE_EJECT
> 
> > -	if (acpi_device->driver == NULL) {
> > +	if (!acpi_device->driver && !acpi_device->handler) {
> 
> I don't understand the fix.
> 
> The if sentence becomes true, when both acpi_device->driver and acpi_device->handler
> are NULL. It means that acpi_eject_store() runs if either acpi_device->driver or
> acpi_device->handler has pointer. Is it O.K.?

Yes.

> I think it should be if (!acpi_device->driver || !acpi_device->handler).

No, the condition has to be "&&" because an acpi_device is _either_
bound to an ACPI driver or an ACPI scan handler. 

Thanks,
-Toshi


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