Re: [PATCH 1/4] PCI: Don't show errors on inaccessible PCI devices

[Mario Limonciello <superm1@kernel.org>]

On 6/9/2025 10:09 AM, Lukas Wunner wrote:
> [cc += Rafael, Mika]
> 
> On Sun, Jun 08, 2025 at 08:58:01PM -0500, Mario Limonciello wrote:
>> --- a/drivers/pci/pci.c
>> +++ b/drivers/pci/pci.c
>> @@ -1376,8 +1376,9 @@ int pci_power_up(struct pci_dev *dev)
>>   
>>   	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
>>   	if (PCI_POSSIBLE_ERROR(pmcsr)) {
>> -		pci_err(dev, "Unable to change power state from %s to D0, device inaccessible\n",
>> -			pci_power_name(dev->current_state));
>> +		if (dev->error_state != pci_channel_io_perm_failure)
>> +			pci_err(dev, "Unable to change power state from %s to D0, device inaccessible\n",
>> +				pci_power_name(dev->current_state));
>>   		dev->current_state = PCI_D3cold;
>>   		return -EIO;
>>   	}
> 
> Instead of merely silencing the error message, why not bail out early on
> in the function, i.e.
> 
> 	if (pci_dev_is_disconnected(dev)) {
> 		dev->current_state = PCI_D3cold;
> 		return -EIO;
> 	}
> 

Thanks for the suggestion.  That sounds good to me, I'll have a try.