linux-kernel - Re: [PATCH 06/10] bus: mhi: core: Set BHI and BHIe pointers to NULL in clean-up

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Date:   Fri, 25 Jun 2021 14:38:58 +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, jhugo@...eaurora.org,
        linux-kernel@...r.kernel.org, loic.poulain@...aro.org,
        kvalo@...eaurora.org, ath11k@...ts.infradead.org,
        stable@...r.kernel.org, Jeffrey Hugo <quic_jhugo@...cinc.com>
Subject: Re: [PATCH 06/10] bus: mhi: core: Set BHI and BHIe pointers to NULL
 in clean-up

On Fri, Jun 25, 2021 at 06:03:51PM +0530, Manivannan Sadhasivam wrote:
> From: Bhaumik Bhatt <bbhatt@...eaurora.org>
> 
> Set the BHI and BHIe pointers to NULL as part of clean-up. This
> makes sure that stale pointers are not accessed after powering
> MHI down.
> 
> Cc: stable@...r.kernel.org

Why is this needed for stable, but patch 5/10 is not?

And what commit does this fix?  How far back should it go?

And is this really fixing anything?

thanks,

greg k-h