linux-kernel - Re: [PATCH v3] PCI/ERR: Use pcie_aer_is_native() to judge whether OS owns AER

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Date:   Tue, 2 Aug 2022 15:18:53 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Zhuo Chen <chenzhuo.1@...edance.com>
Cc:     ruscur@...sell.cc, oohall@...il.com, bhelgaas@...gle.com,
        lukas@...ner.de, jan.kiszka@...mens.com, stuart.w.hayes@...il.com,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] PCI/ERR: Use pcie_aer_is_native() to judge whether OS
 owns AER



On 7/27/22 2:37 AM, Zhuo Chen wrote:
>>
> Do you mean changing "if ((host->native_aer || pcie_ports_native) && aer)" into "if (pcie_aer_is_native(dev) && aer)" ?
> I thought changing into "if (pcie_aer_is_native(dev))" before.
> 
> One another doubt. Not every pci device support aer. When dev->aer_cap is NULL and root->aer_cap is not NULL in aer_root_reset(), pcie_aer_is_native() will return false and OS cannot operate root register. It's different from just using "(host->native_aer || pcie_ports_native)".
> 
> Or we can change "if ((host->native_aer || pcie_ports_native) && aer)" into "if (pcie_aer_is_native(root))". But in this way, argument NULL pointer check should be added in pcie_aer_is_native().

Looking into it again, I think it is better to leave it as it is. Please ignore my comment.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer