linux-kernel - Re: [PATCH V5 3/3] PCI: Mask and unmask hotplug interrupts during reset

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Message-ID: <d34eb5da-0ae1-d455-93e2-2432ec7931ea@kernel.org>
Date:   Fri, 20 Jul 2018 23:07:20 -0700
From:   Sinan Kaya <okaya@...nel.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lukas Wunner <lukas@...ner.de>,
        Oza Pawandeep <poza@...eaurora.org>, linux-pci@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        Keith Busch <keith.busch@...el.com>,
        linux-arm-msm@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V5 3/3] PCI: Mask and unmask hotplug interrupts during
 reset

On 7/20/2018 7:58 PM, Sinan Kaya wrote:
> We need to figure out how to gracefully return inside hotplug driver
> if link down happened and there is an error pending.

How about adding the following into the hotplug ISR?

1. check if firmware first is disabled
2. check if there is a fatal error pending in the device_status register
of the PCI Express capability on the root port.
3. bail out from hotplug routine if this is the case.
4. otherwise, existing behavior.