linux-kernel - Re: [PATCH v2 5/7] Xen / ACPI / processor: Remove unneeded NULL check in xen_acpi_processor

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Date:	Sat, 9 May 2015 18:06:42 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH v2 5/7] Xen / ACPI / processor: Remove unneeded NULL
 check in xen_acpi_processor_enable()

On Tue, May 05, 2015 at 11:29:05AM +0100, Stefano Stabellini wrote:
> CC'ing Konrad and David.
> 
> On Tue, 5 May 2015, Hanjun Guo wrote:
> > Before xen_acpi_processor_enable() is called, struct acpi_processor *pr is
> > allocated in xen_acpi_processor_add() and checked if it's NULL, so no need
> > to check again when passed to xen_acpi_processor_enable(), just remove it.

Sounds right.

> > 
> > Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> > CC: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> > CC: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > ---
> >  drivers/xen/xen-acpi-cpuhotplug.c | 8 +-------
> >  1 file changed, 1 insertion(+), 7 deletions(-)
> > 
> > diff --git a/drivers/xen/xen-acpi-cpuhotplug.c b/drivers/xen/xen-acpi-cpuhotplug.c
> > index 5a62aa0..f4a3694 100644
> > --- a/drivers/xen/xen-acpi-cpuhotplug.c
> > +++ b/drivers/xen/xen-acpi-cpuhotplug.c
> > @@ -46,13 +46,7 @@ static int xen_acpi_processor_enable(struct acpi_device *device)
> >  	unsigned long long value;
> >  	union acpi_object object = { 0 };
> >  	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
> > -	struct acpi_processor *pr;
> > -
> > -	pr = acpi_driver_data(device);
> > -	if (!pr) {
> > -		pr_err(PREFIX "Cannot find driver data\n");
> > -		return -EINVAL;
> > -	}
> > +	struct acpi_processor *pr = acpi_driver_data(device);
> >  
> >  	if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
> >  		/* Declared with "Processor" statement; match ProcessorID */
> > -- 
> > 1.9.1
> > 
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