linux-kernel - Re: [PATCH V4 7/7] PCI: Handle link reset via hotplug if supported

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Date:   Sun, 01 Jul 2018 13:24:28 -0400
From:   okaya@...eaurora.org
To:     Lukas Wunner <lukas@...ner.de>
Cc:     linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oza Pawandeep <poza@...eaurora.org>,
        Keith Busch <keith.busch@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 7/7] PCI: Handle link reset via hotplug if supported

On 2018-07-01 13:14, Lukas Wunner wrote:
> On Thu, Jun 28, 2018 at 03:31:05PM -0400, Sinan Kaya wrote:
>> +static pci_ers_result_t pciehp_reset_link(struct pci_dev *pdev)
>> +{
>> +	struct pcie_device *pciedev;
>> +	struct controller *ctrl;
>> +	struct device *devhp;
>> +	struct slot *slot;
>> +	int rc;
>> +
>> +	devhp = pcie_port_find_device(pdev, PCIE_PORT_SERVICE_HP);
>> +	pciedev = to_pcie_device(devhp);
>> +	ctrl = get_service_data(pciedev);
>> +	slot = ctrl->slot;
>> +
>> +	rc = reset_slot(slot->hotplug_slot, 0);
>> +
>> +	return !rc ? PCI_ERS_RESULT_RECOVERED : PCI_ERS_RESULT_DISCONNECT;
>> +}
> 
> This looks like a bit of a detour.  There's a "struct pci_slot *slot"
> pointer in struct pci_dev.  Any reason not to simply call:
> 
> 	rc = reset_slot(pdev->slot->hotplug_slot)

pdev here is the bridge. Slot pointers are only valid for children 
objects.


> 
> Lukas