linux-kernel - Re: [PATCH 3/3] bus: mhi: pci-generic: Fix hibernation

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Date:   Wed, 9 Jun 2021 19:04:35 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     hemantk@...eaurora.org, bbhatt@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        jarvis.w.jiang@...il.com, loic.poulain@...aro.org,
        Shujun Wang <wsj20369@....com>
Subject: Re: [PATCH 3/3] bus: mhi: pci-generic: Fix hibernation

On Sun, Jun 06, 2021 at 09:07:41PM +0530, Manivannan Sadhasivam wrote:
> From: Loic Poulain <loic.poulain@...aro.org>
> 
> This patch fixes crash after resuming from hibernation. The issue
> occurs when mhi stack is builtin and so part of the 'restore-kernel',
> causing the device to be resumed from 'restored kernel' with a no
> more valid context (memory mappings etc...) and leading to spurious
> crashes.
> 
> This patch fixes the issue by implementing proper freeze/restore
> callbacks.
> 
> Reported-by: Shujun Wang <wsj20369@....com>
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Link: https://lore.kernel.org/r/1622571445-4505-1-git-send-email-loic.poulain@linaro.org
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/bus/mhi/pci_generic.c | 36 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)

Also needs a stable link, right?  I'll go add it by hand.  Please be
more careful next time...

greg k-h