linux-kernel - Re: [PATCH v4 1/3] bus: mhi: core: Clear devices when moving execution environments

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Date:   Fri, 19 Feb 2021 09:10:11 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>,
        manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        linux-kernel@...r.kernel.org, loic.poulain@...aro.org,
        carl.yin@...ctel.com, naveen.kumar@...ctel.com
Subject: Re: [PATCH v4 1/3] bus: mhi: core: Clear devices when moving
 execution environments

On 2/18/2021 7:17 PM, Bhaumik Bhatt wrote:
> When moving from SBL to mission mode execution environment, there
> is no remove callback notification to MHI client drivers which
> operate on SBL mode only. Client driver devices are being created
> in SBL or AMSS(mission mode) and only destroyed after power down
> or SYS_ERROR. If there exist any SBL-specific channels, those are
> left open and client drivers are thus unaware of the new execution
> environment where those channels cannot operate. Close the gap and
> issue remove callbacks to SBL-specific client drivers once device
> enters mission mode.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> ---

I like the idea, but I question where this is limited to the transition 
to mission mode.  Feels like something that should occur on all EE 
changes.  We might not have a current usecase that is outside what 
you've implemented here, but I don't think there is anything preventing 
that in future.

-- 
Jeffrey Hugo
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.