linux-kernel - Re: [PATCH] bus: mhi: host: pci_generic: Add missing poweroff() PM callback

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Mon, 4 Apr 2022 09:05:11 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     mhi@...ts.linux.dev, quic_hemantk@...cinc.com,
        quic_bbhatt@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] bus: mhi: host: pci_generic: Add missing poweroff() PM callback

On Mon, 4 Apr 2022 at 08:41, Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
>
> During hibernation process, once thaw() stage completes, the MHI endpoint
> devices will be in M0 state post recovery. After that, the devices will be
> powered down so that the system can enter the target sleep state. During
> this stage, the PCI core will put the devices in D3hot. But this transition
> is allowed by the MHI spec. The devices can only enter D3hot when it is in
> M3 state.
>
> So for fixing this issue, let's add the poweroff() callback that will get
> executed before putting the system in target sleep state during
> hibernation. This callback will put the device in M3 state and that would
> allow it to receive the D3hot afterwards.
>
> Cc: stable@...r.kernel.org
> Fixes: 5f0c2ee1fe8d ("bus: mhi: pci-generic: Fix hibernation")
> Reported-by: Hemant Kumar <quic_hemantk@...cinc.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Reviewed-by: Loic Poulain <loic.poulain@...aro.org>


> ---
>  drivers/bus/mhi/host/pci_generic.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 9527b7d63840..b1c0a8887496 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -1085,6 +1085,7 @@ static const struct dev_pm_ops mhi_pci_pm_ops = {
>         .resume = mhi_pci_resume,
>         .freeze = mhi_pci_freeze,
>         .thaw = mhi_pci_restore,
> +       .poweroff = mhi_pci_suspend,
>         .restore = mhi_pci_restore,
>  #endif
>  };
> --
> 2.25.1
>