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

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Message-ID: <6742910.A5LcpWTI3L@skinner>
Date:	Tue, 14 Apr 2015 18:28:59 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Lucas Stach <dev@...xeye.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

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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