Re: [PATCH 1/7] PCI/DPC: Avoid access to non-existent AER capability

[sashiko-bot@kernel.org]

> Downstream Port Containment does not mandate presence of an Advanced Error
> Reporting capability, so a Downstream Port may support DPC, but not AER
> (PCIe r7.1 sec 6.2.11.2).
> 
> In February 2019, commit 9f08a5d896ce ("PCI/DPC: Fix print AER status in
> DPC event handling") amended the DPC driver to access the AER capability
> without checking for its presence.
> 
> In May 2020, commit 708b20003624 ("PCI/AER: Remove HEST/FIRMWARE_FIRST
> parsing for AER ownership") fixed it by inserting a call to
> pcie_aer_is_native() in dpc_probe(), which implicitly checks for presence
> of an AER capability.
> 
> However already in October 2019, commit 35a0b2378c19 ("PCI/DPC: Add
> "pcie_ports=dpc-native" to allow DPC without AER control") made it
> [ ... ]
> for AER-unsupporting devices.  The check will become obsolete and will be
> removed with the imminent baseline capability error reporting.
> 
> Fixes: 35a0b2378c19 ("PCI/DPC: Add "pcie_ports=dpc-native" to allow DPC without AER control")
> Signed-off-by: Lukas Wunner <lukas@wunner.de>

Sashiko has reviewed this patch and found no issues. It looks great!

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