linux-kernel - Re: [PATCH 1/1] PCI: Restore assigned resources fully after release

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Message-ID: <c295d86d-fb5a-4379-b998-719f39dbb209@roeck-us.net>
Date: Thu, 3 Apr 2025 05:16:01 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Igor Mammedov <imammedo@...hat.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Michał Winiarski <michal.winiarski@...el.com>
Subject: Re: [PATCH 1/1] PCI: Restore assigned resources fully after release

On Thu, Apr 03, 2025 at 12:31:37PM +0300, Ilpo Järvinen wrote:
> PCI resource fitting code in __assign_resources_sorted() runs in
> multiple steps. A resource that was successfully assigned may have to
> be released before the next step attempts assignment again. The
> assign+release cycle is destructive to a start-aligned struct resource
> (bridge window or IOV resource) because the start field is overwritten
> with the real address when the resource got assigned.
> 
> Properly restore the resource after releasing it. The start, end, and
> flags fields must be stored into the related struct pci_dev_resource in
> order to be able to restore the resource to its original state.
> 
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Fixes: 96336ec70264 ("PCI: Perform reset_resource() and build fail list in sync")
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Tested-by: Guenter Roeck <linux@...ck-us.net>

Guenter