linux-kernel - Re: [PATCH] cpupower: fix breakage from libpci API change

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Date:	Tue, 28 Apr 2015 21:26:49 +0200
From:	Lucas Stach <dev@...xeye.de>
To:	Thomas Renninger <trenn@...e.de>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	rjw@...ysocki.net
Subject: Re: [PATCH] cpupower: fix breakage from libpci API change

So, who is going to pick up this patch?

Regards,
Lucas

Am Dienstag, den 14.04.2015, 18:28 +0200 schrieb Thomas Renninger:
> Hi,
> 
> On Monday, April 13, 2015 10:24:01 PM Lucas Stach wrote:
> > libpci 3.3.0 introduced an additional member in the pci_filter struct
> > which needs to be initialized to -1 to get the same behavior as before
> > the API change.
> Sounds not that clever, but there probably is a reason for this...
> 
> I am not that familiar with the pci lib and its recent changes, but
> below patch looks reasonable.
> 
> Acked-by: Thomas Renninger <trenn@...e.de>
> 
> 
> > The libpci internal helpers got updated accordingly,
> > but as the cpupower pci helpers initialized the struct themselves the
> > behavior changed.
> > 
> > Use the libpci helper pci_filter_init() to fix this and guard against
> > similar breakages in the future.
> > 
> > This fixes probing of the AMD fam12h/14h cpuidle monitor on systems
> > with libpci >= 3.3.0.
> > 
> > Signed-off-by: Lucas Stach <dev@...xeye.de>
> > ---
> >  tools/power/cpupower/utils/helpers/pci.c | 11 +++++++++--
> >  1 file changed, 9 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/power/cpupower/utils/helpers/pci.c
> > b/tools/power/cpupower/utils/helpers/pci.c index 9690798..8b27898 100644
> > --- a/tools/power/cpupower/utils/helpers/pci.c
> > +++ b/tools/power/cpupower/utils/helpers/pci.c
> > @@ -25,14 +25,21 @@
> >  struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
> > int slot, int func, int vendor, int dev)
> >  {
> > -	struct pci_filter filter_nb_link = { domain, bus, slot, func,
> > -					     vendor, dev };
> > +	struct pci_filter filter_nb_link;
> >  	struct pci_dev *device;
> > 
> >  	*pacc = pci_alloc();
> >  	if (*pacc == NULL)
> >  		return NULL;
> > 
> > +	pci_filter_init(*pacc, &filter_nb_link);
> > +	filter_nb_link.domain	= domain;
> > +	filter_nb_link.bus	= bus;
> > +	filter_nb_link.slot	= slot;
> > +	filter_nb_link.func	= func;
> > +	filter_nb_link.vendor	= vendor;
> > +	filter_nb_link.device	= dev;
> > +
> >  	pci_init(*pacc);
> >  	pci_scan_bus(*pacc);
> 


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