linux-kernel - Re: [PATCH v2] PCI: dpc: Increase pciehp waiting time for DPC recovery

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Message-ID: <aYRatwSvUG0yQkHd@wunner.de>
Date: Thu, 5 Feb 2026 09:54:15 +0100
From: Lukas Wunner <lukas@...ner.de>
To: LeoLiu-oc <LeoLiu-oc@...oxin.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Oliver O'Halloran <oohall@...il.com>, linuxppc-dev@...ts.ozlabs.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	CobeChen@...oxin.com, ErosZhang@...oxin.com, TonyWWang@...oxin.com
Subject: Re: [PATCH v2] PCI: dpc: Increase pciehp waiting time for DPC
 recovery

On Wed, Feb 04, 2026 at 11:55:42AM +0800, LeoLiu-oc wrote:
> For example, The execution of the ice_pci_err_detected() in the ice network
> card driver exceeded the maximum waiting time for DPC recovery, causing the
> pciehp_disable_slot() to be executed which is not needed. From the user's
> point of view, you will see that the ice network card may not be usable and
> could even cause more serious errors, such as a kernel panic. kernel panic
> is caused by a race between pciehp_disable_slot() and pcie_do_recovery().
> In practice, we would observe that the ice network card is in an
> unavailable state and a kernel panic.

Unfortunately v2 was submitted without answering all of the questions
and testing all of the things asked for during review:

https://lore.kernel.org/all/aYBoP-B2E9fp_4YZ@wunner.de/