linux-kernel - Re: [RFC PATCH v10 3/5] PCI: make pci_dev_is_disconnected() helper public for other drivers

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Date: Wed, 10 Jan 2024 13:25:46 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Ethan Zhao <haifeng.zhao@...ux.intel.com>, kevin.tian@...el.com,
 bhelgaas@...gle.com, dwmw2@...radead.org, will@...nel.org,
 robin.murphy@....com, lukas@...ner.de
Cc: baolu.lu@...ux.intel.com, linux-pci@...r.kernel.org,
 iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v10 3/5] PCI: make pci_dev_is_disconnected() helper
 public for other drivers

On 12/29/23 1:05 AM, Ethan Zhao wrote:
> Make pci_dev_is_disconnected() public so that it can be called from
> Intel VT-d driver to quickly fix/workaround the surprise removal
> unplug hang issue for those ATS capable devices on PCIe switch downstream
> hotplug capable ports.
> 
> Beside pci_device_is_present() function, this one has no config space
> space access, so is light enough to optimize the normal pure surprise
> removal and safe removal flow.
> 
> Tested-by: Haorong Ye<yehaorong@...edance.com>
> Signed-off-by: Ethan Zhao<haifeng.zhao@...ux.intel.com>
> ---
>   drivers/pci/pci.h   | 5 -----
>   include/linux/pci.h | 5 +++++
>   2 files changed, 5 insertions(+), 5 deletions(-)

This should be moved before PATCH 2/5? Otherwise, PATCH 2/5 couldn't be
compiled.

Best regards,
baolu