linux-kernel - Re: [PATCH v2 14/16] net: qrtr: Add MHI transport layer

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Message-ID: <20200203101225.43bd27bc@cakuba.hsd1.ca.comcast.net>
Date:   Mon, 3 Feb 2020 10:12:25 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     gregkh@...uxfoundation.org, arnd@...db.de, smohanad@...eaurora.org,
        jhugo@...eaurora.org, kvalo@...eaurora.org,
        bjorn.andersson@...aro.org, hemantk@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 14/16] net: qrtr: Add MHI transport layer

On Fri, 31 Jan 2020 19:20:07 +0530, Manivannan Sadhasivam wrote:
> +/* From QRTR to MHI */
> +static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
> +				      struct mhi_result *mhi_res)
> +{
> +	struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
> +	struct qrtr_mhi_pkt *pkt;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&qdev->ul_lock, flags);
> +	pkt = list_first_entry(&qdev->ul_pkts, struct qrtr_mhi_pkt, node);
> +	list_del(&pkt->node);
> +	complete_all(&pkt->done);
> +
> +	kref_put(&pkt->refcount, qrtr_mhi_pkt_release);

Which kref_get() does this pair with?

Looks like qcom_mhi_qrtr_send() will release a reference after
completion, too.

> +	spin_unlock_irqrestore(&qdev->ul_lock, flags);
> +}