linux-kernel - Re: [RFC][PATCH 2/10] PCI PM: Add suspend counterpart of pci_reenable

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Date:	Mon, 5 Jan 2009 11:49:47 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, Greg KH <greg@...ah.com>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [RFC][PATCH 2/10] PCI PM: Add suspend counterpart of pci_reenable_device

Hi!

> PCI devices without drivers are not disabled during suspend and
> hibernation, but they are enabled during resume, with the help of
> pci_reenable_device(), so there is an unbalanced execution of
> pcibios_enable_device() in the resume code path.
> 
> To correct this introduce function pci_disable_enabled_device()
> that will disable the argument device, if it is enabled when the
> function is being run, without updating the device's pci_dev
> structure and use it in the suspend code path to balance the
> pci_reenable_device() executed during resume.

> +/**
> + * pci_disable_enabled_device - Disable device without updating enable_cnt
> + * @dev: PCI device to disable
> + *
> + * NOTE: This function is a backend of PCI power management routines and is
> + * not supposed to be called drivers.

"by drivers"?

> @@ -441,7 +455,10 @@ static int pci_pm_suspend(struct device 
>  		}
>  	} else if (pci_has_legacy_pm_support(pci_dev)) {
>  		error = pci_legacy_suspend(dev, PMSG_SUSPEND);
> +	} else {
> +		pci_default_pm_suspend_early(pci_dev);
>  	}
> +
>  	pci_fixup_device(pci_fixup_suspend, pci_dev);
>  
>  	return error;

So tre fixup runs on the disabled device?

Acked-by: Pavel Machek <Pavel@...e.cz>

-- 
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