linux-kernel - Re: [PATCH] net: qrtr: Unprepare MHI channels during remove

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Message-ID: <5e94c0be-9402-7309-5d65-857a27d1f491@codeaurora.org>
Date:   Wed, 18 Nov 2020 11:34:17 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>,
        manivannan.sadhasivam@...aro.org
Cc:     kvalo@...eaurora.org, linux-wireless@...r.kernel.org,
        cjhuang@...eaurora.org, linux-arm-msm@...r.kernel.org,
        hemantk@...eaurora.org, linux-kernel@...r.kernel.org,
        ath11k@...ts.infradead.org, clew@...eaurora.org,
        loic.poulain@...aro.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: qrtr: Unprepare MHI channels during remove

On 11/18/2020 11:20 AM, Bhaumik Bhatt wrote:
> Reset MHI device channels when driver remove is called due to
> module unload or any crash scenario. This will make sure that
> MHI channels no longer remain enabled for transfers since the
> MHI stack does not take care of this anymore after the auto-start
> channels feature was removed.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> ---
>   net/qrtr/mhi.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
> index 7100f0b..2bf2b19 100644
> --- a/net/qrtr/mhi.c
> +++ b/net/qrtr/mhi.c
> @@ -104,6 +104,7 @@ static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
>   	struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
>   
>   	qrtr_endpoint_unregister(&qdev->ep);
> +	mhi_unprepare_from_transfer(mhi_dev);
>   	dev_set_drvdata(&mhi_dev->dev, NULL);
>   }
>   
> 

I admit, I didn't pay much attention to the auto-start being removed, 
but this seems odd to me.

As a client, the MHI device is being removed, likely because of some 
factor outside of my control, but I still need to clean it up?  This 
really feels like something MHI should be handling.

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