linux-kernel - Re: [PATCH 1/3] mfd: sta2x11-mfd: use named constants for pci_power

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Date:	Mon, 6 Jan 2014 12:17:26 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Lee Jones <lee.jones@...aro.org>
cc:	Julia Lawall <Julia.Lawall@...6.fr>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mfd: sta2x11-mfd: use named constants for pci_power_t
 values

On Mon, 6 Jan 2014, Lee Jones wrote:

> On Fri, 03 Jan 2014, Julia Lawall wrote:
>
> > From: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > The semantic patch that makes this change is as follows:
> > (http://coccinelle.lip6.fr/)
> >
> > // <smpl>
> > @@
> > expression pdev;
> > @@
> >
> > pci_set_power_state(pdev,
> > - 0
> > + PCI_D0
> >  )
> > // </smpl>
>
> I'm happy with the code and that you used Coccinelle to discover the
> issue, but I feel a little more explanation would be helpful to
> readers.
>
> Why is (pci_power_t __force) 0 better than 0?

I wasn't particularly attached to the cast, and I don't know if it is an
issue.  But in trying to understand the code, I found PCI_D0 more
understandable than 0.

julia

> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > ---
> >  drivers/mfd/sta2x11-mfd.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/mfd/sta2x11-mfd.c b/drivers/mfd/sta2x11-mfd.c
> > index 0d42e40..5b72db0 100644
> > --- a/drivers/mfd/sta2x11-mfd.c
> > +++ b/drivers/mfd/sta2x11-mfd.c
> > @@ -529,7 +529,7 @@ static int sta2x11_mfd_resume(struct pci_dev *pdev)
> >  {
> >  	int err;
> >
> > -	pci_set_power_state(pdev, 0);
> > +	pci_set_power_state(pdev, PCI_D0);
> >  	err = pci_enable_device(pdev);
> >  	if (err)
> >  		return err;
> >
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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