linux-kernel - Re: [PATCH] PCI: ACPI: PM: Fix debug message in acpi_pci_set_power

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Message-ID: <20210331210845.GA1422864@bjorn-Precision-5520>
Date:   Wed, 31 Mar 2021 16:08:45 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        David Box <david.e.box@...ux.intel.com>,
        Krzysztof Wilczyński <kw@...ux.com>
Subject: Re: [PATCH] PCI: ACPI: PM: Fix debug message in
 acpi_pci_set_power_state()

On Thu, Mar 25, 2021 at 07:57:51PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> If PCI_D3cold is passed to acpi_pci_set_power_state() as the second
> argument and there is no ACPI D3cold support for the given device,
> the debug message printed by that function will state that the
> device power state has been changed to D3cold, while in fact it
> will be D3hot, because acpi_device_set_power() falls back to D3hot
> automatically if D3cold is not supported without returning an error.
> 
> To address this issue, modify the debug message in question to print
> the current power state of the target PCI device's ACPI companion
> instead of printing the target power state which may not reflect
> the real final power state of the device.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Applied with Krzysztof's reviewed-by to pci/pm for v5.13, thanks!

Let me know if you have nearby or related changes that you'd rather
take via your tree.

> ---
>  drivers/pci/pci-acpi.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-pm/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci-acpi.c
> +++ linux-pm/drivers/pci/pci-acpi.c
> @@ -1021,7 +1021,7 @@ static int acpi_pci_set_power_state(stru
>  
>  	if (!error)
>  		pci_dbg(dev, "power state changed by ACPI to %s\n",
> -			 acpi_power_state_string(state_conv[state]));
> +		        acpi_power_state_string(adev->power.state));
>  
>  	return error;
>  }
> 
> 
>