linux-kernel - Re: [PATCH 6/6] rpmsg: glink: Cancel pending intent requests at removal

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Date:   Tue, 24 Jan 2023 23:07:27 -0800
From:   Chris Lew <quic_clew@...cinc.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] rpmsg: glink: Cancel pending intent requests at
 removal



On 1/9/2023 2:40 PM, Bjorn Andersson wrote:
> During removal of the glink edge interrupts are disabled and no more
> incoming messages are being serviced. In addition to the remote endpoint
> being defunct that means that any outstanding requests for intents will
> not be serviced, and qcom_glink_request_intent() will blindly wait for
> up to 10 seconds.
> 
> Mark the intent request as not granted and complete the intent request
> completion to fail the waiting client immediately.
> 
> Once the current intent request is failed, any potential clients waiting
> for the intent request mutex will not enter the same wait, as the
> qcom_glink_tx() call will fail fast.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---

Reviewed-by: Chris Lew <quic_clew@...cinc.com>

>   drivers/rpmsg/qcom_glink_native.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
> index d81d0729493e..bb14e7edeadc 100644
> --- a/drivers/rpmsg/qcom_glink_native.c
> +++ b/drivers/rpmsg/qcom_glink_native.c
> @@ -423,6 +423,12 @@ static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
>   	complete(&channel->intent_req_comp);
>   }
>   
> +static void qcom_glink_intent_req_abort(struct glink_channel *channel)
> +{
> +	channel->intent_req_result = 0;
> +	complete(&channel->intent_req_comp);
> +}
> +
>   /**
>    * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
>    * @glink: Ptr to the glink edge
> @@ -1788,6 +1794,12 @@ void qcom_glink_native_remove(struct qcom_glink *glink)
>   	wake_up_all(&glink->tx_avail_notify);
>   	spin_unlock_irqrestore(&glink->tx_lock, flags);
>   
> +	/* Abort any senders waiting for intent requests */
> +	spin_lock_irqsave(&glink->idr_lock, flags);
> +	idr_for_each_entry(&glink->lcids, channel, cid)
> +		qcom_glink_intent_req_abort(channel);
> +	spin_unlock_irqrestore(&glink->idr_lock, flags);
> +
>   	ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
>   	if (ret)
>   		dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);