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

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Date:   Tue, 8 Aug 2023 11:25:06 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Igor Mammedov <imammedo@...hat.com>
Cc:     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

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>

Thanks for looking into this,
Michal

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