linux-kernel - Re: [PATCH] bus: mhi: host: Disable preemption while processing data events

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Message-ID: <25b67462-d6a6-c564-6830-694b726bd1d9@quicinc.com>
Date:   Mon, 7 Nov 2022 08:00:02 -0700
From:   Jeffrey Hugo <quic_jhugo@...cinc.com>
To:     Qiang Yu <quic_qianyu@...cinc.com>, <mani@...nel.org>,
        <loic.poulain@...aro.org>
CC:     <mhi@...ts.linux.dev>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_cang@...cinc.com>,
        <mrana@...cinc.com>
Subject: Re: [PATCH] bus: mhi: host: Disable preemption while processing data
 events

On 11/3/2022 1:55 AM, Qiang Yu wrote:
> If data processing of an event is scheduled out because core
> is busy handling multiple irqs, this can starves the processing
> of MHI M0 state change event on another core. Fix this issue by
> disabling irq on the core processing data events.

Can you elaborate on the scenario more?

If a device hasn't entered M0, then what event could be processed?