linux-kernel - Re: [PATCH V4 4/7] PCI: Unify try slot and bus reset API

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Date:   Sat, 30 Jun 2018 00:43:32 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Peter Xu <peterx@...hat.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        "open list:HFI1 DRIVER" <linux-rdma@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:VFIO DRIVER" <kvm@...r.kernel.org>
Subject: Re: [PATCH V4 4/7] PCI: Unify try slot and bus reset API

On Thu, Jun 28, 2018 at 10:31 PM, Sinan Kaya <okaya@...eaurora.org> wrote:
> Drivers are expected to call pci_try_reset_slot() or pci_try_reset_bus() by
> querying if a system supports hotplug or not. A survey showed that most
> drivers don't do this and we are leaking hotplug capability to the user.
>
> Hide pci_try_slot_reset() from drivers and embed into pci_try_bus_reset().
> Change pci_try_reset_bus() parameter from struct pci_bus to struct pci_dev.

> +/**
> + * pci_try_reset_bus - Try to reset a PCI bus
> + * @pdev: top level PCI device to reset via slot/bus
> + *
> + * Same as above except return -EAGAIN if the bus cannot be locked
> + */
> +int pci_try_reset_bus(struct pci_dev *pdev)
> +{
> +       bool slot = false;
> +
> +       if (!pci_probe_reset_slot(pdev->slot))
> +               slot = true;
> +
> +       return slot ? __pci_try_reset_slot(pdev->slot) :
> +                       __pci_try_reset_bus(pdev->bus);

This can be as simple as

  return pci_probe_reset_slot(pdev->slot) ?
    __pci_try_reset_bus(pdev->slot) : __pci_try_reset_slot(pdev->bus);


> +}
>  EXPORT_SYMBOL_GPL(pci_try_reset_bus);


-- 
With Best Regards,
Andy Shevchenko