linux-kernel - Re: [PATCH v11 1/5] PCI: Conditionally initialize host bridge native

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Date:   Wed, 28 Oct 2020 10:14:10 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Ethan Zhao <xerces.zhao@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ashok Raj <ashok.raj@...el.com>, knsathya@...nel.org
Subject: Re: [PATCH v11 1/5] PCI: Conditionally initialize host bridge
 native_* members



On 10/27/20 11:09 PM, Ethan Zhao wrote:
> On Tue, Oct 27, 2020 at 10:00 PM Kuppuswamy Sathyanarayanan
> <sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>>
>> If CONFIG_PCIEPORTBUS is not enabled in kernel then initialing
>> struct pci_host_bridge PCIe specific native_* members to "1" is
>> incorrect. So protect the PCIe specific member initialization
>> with CONFIG_PCIEPORTBUS.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>> ---
>>   drivers/pci/probe.c | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index 4289030b0fff..756fa60ca708 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -588,12 +588,14 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
>>           * may implement its own AER handling and use _OSC to prevent the
>>           * OS from interfering.
>>           */
>> +#ifdef CONFIG_PCIEPORTBUS
>>          bridge->native_aer = 1;
>>          bridge->native_pcie_hotplug = 1;
>> -       bridge->native_shpc_hotplug = 1;
>>          bridge->native_pme = 1;
>> -       bridge->native_ltr = 1;
>>          bridge->native_dpc = 1;
>> +#endif
>    If CONFIG_PCIEPORTBUS wasn't defined, leave them to "unknown" value ?
By default all of them are 0.
> 
>> +       bridge->native_ltr = 1;
>> +       bridge->native_shpc_hotplug = 1;
>>
>>          device_initialize(&bridge->dev);
>>   }
>> --
>> 2.17.1
>>

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer