linux-kernel - Re: [PATCH v8 09/28] mailbox: Add Gunyah message queue mailbox

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Date:   Mon, 2 Jan 2023 11:43:30 +0530
From:   Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
To:     Elliot Berman <quic_eberman@...cinc.com>
CC:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Jonathan Corbet <corbet@....net>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        "Carl van Schaik" <quic_cvanscha@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "Dmitry Baryshkov" <dmitry.baryshkov@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v8 09/28] mailbox: Add Gunyah message queue mailbox

* Elliot Berman <quic_eberman@...cinc.com> [2022-12-19 14:58:30]:

> +static inline bool gh_msgq_has_tx(struct gh_msgq *msgq)
> +{

Consider possibility that msgq->tx_ghrc can be NULL?

> +	return msgq->tx_ghrsc->type == GUNYAH_RESOURCE_TYPE_MSGQ_TX;
> +}
> +
> +static inline bool gh_msgq_has_rx(struct gh_msgq *msgq)
> +{

Consider possibility that msgq->rx_ghrc can be NULL?

> +	return msgq->rx_ghrsc->type == GUNYAH_RESOURCE_TYPE_MSGQ_RX;
> +}
> +
> +static irqreturn_t gh_msgq_rx_irq_handler(int irq, void *data)
> +{
> +	struct gh_msgq *msgq = data;
> +	struct gh_msgq_rx_data rx_data;
> +	unsigned long gh_err;
> +	ssize_t ret;
> +	bool ready = false;
> +
> +	do {
> +		gh_err = gh_hypercall_msgq_recv(msgq->rx_ghrsc->capid,
> +				(uintptr_t)&rx_data.data, sizeof(rx_data.data),
> +				&rx_data.length, &ready);
> +		if (gh_err == GH_ERROR_OK) {
> +			mbox_chan_received_data(gh_msgq_chan(msgq), &rx_data);
> +		} else if (GH_ERROR_MSGQUEUE_EMPTY) {

gh_err == GH_ERROR_MSGQUEUE_EMPTY 

> +			break;
> +		} else {
> +			pr_warn("Failed to receive data from msgq for %s: %ld\n",
> +				msgq->mbox.dev ? dev_name(msgq->mbox.dev) : "", ret);
> +			break;
> +		}
> +	} while (ready);
> +
> +	return IRQ_HANDLED;
> +}