linux-kernel - Re: [PATCH 5/5] PCI: PM: Fold __pci_complete_power

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Date:   Tue, 5 Nov 2019 08:09:43 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH 5/5] PCI: PM: Fold __pci_complete_power_transition() into
 its caller

On Tue, Nov 05, 2019 at 11:32:02AM +0100, Rafael J. Wysocki wrote:
>  	if (state > PCI_D3cold)
> @@ -1132,10 +1112,12 @@ int pci_set_power_state(struct pci_dev *
>  	error = pci_raw_set_power_state(dev, state > PCI_D3hot ?
>  					PCI_D3hot : state);
>  
> -	if (!__pci_complete_power_transition(dev, state))
> -		error = 0;
> +	ret = pci_platform_power_transition(dev, state);
> +	/* Powering off a bridge may power off the whole hierarchy */
> +	if (!ret && state == PCI_D3cold)
> +		pci_bus_set_current_state(dev->subordinate, PCI_D3cold);
>  
> -	return error;
> +	return ret ? error : 0;

Total nitpick, but why not:

	if (pci_platform_power_transition(dev, state))
		return error;

	/* Powering off a bridge may power off the whole hierarchy */
	if (state == PCI_D3cold)
		pci_bus_set_current_state(dev->subordinate, PCI_D3cold);
	return 0;