linux-kernel - Re: [PATCH 1/1] PCI: acpiphp:: use pci_assign_unassigned_bridge

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Date:   Tue, 8 Aug 2023 14:35:29 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     Igor Mammedov <imammedo@...hat.com>, linux-kernel@...r.kernel.org,
        terraluna977@...il.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, mst@...hat.com, rafael@...nel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/1] PCI: acpiphp:: use
 pci_assign_unassigned_bridge_resources() only if bus->self not NULL

On Tue, Aug 08, 2023 at 11:25:06AM +0200, Michal Koutný wrote:
> Hello.
> 
> On Wed, Jul 26, 2023 at 02:35:18PM +0200, Igor Mammedov <imammedo@...hat.com> wrote:
> > The issue was discovered on Dell Inspiron 7352/0W6WV0 laptop with
> > following sequence:
> >    1. suspend to RAM
> >    2. wake up with the same backtrace being observed:
> >    3. 2nd suspend to RAM attempt makes laptop freeze
> 
> My Dell laptop suffers this since v6.5-rc1.
> I've found this thread because of the same call stack triggering the
> NULL ptr dereference I captured on my machine.
> 
> I applied this patch and resume works as before and I have observed no
> issues during typical usage.
> 
> I'd be glad if a fix like this makes it into the next -rc.
> Feel free to add
> 
> Tested-by: Michal Koutný <mkoutny@...e.com>

Added tested-by for both you and Woody, thank you very much!  This
should appear in -rc6.

Bjorn