linux-kernel - Re: [PATCH v5 1/5] mailbox: zynqmp: fix counts of child nodes

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Date:   Mon, 13 Mar 2023 13:38:44 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Tanmay Shah <tanmay.shah@....com>
Cc:     michal.simek@....com, andersson@...nel.org,
        jaswinder.singh@...aro.org, ben.levinsky@....com,
        shubhrajyoti.datta@....com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH v5 1/5] mailbox: zynqmp: fix counts of child nodes

On Fri, Mar 10, 2023 at 05:24:04PM -0800, Tanmay Shah wrote:
> If child mailbox node status is disabled it causes
> crash in interrupt handler. Fix this by assigning
> only available child node during driver probe.
> 
> Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> ---
> 
> Changes in v5:
>   - mailbox node count should not be 0 for driver to probe
> 
>  drivers/mailbox/zynqmp-ipi-mailbox.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
> index a4c8d23c76e2..ae47fbac38d2 100644
> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
> @@ -634,7 +634,12 @@ static int zynqmp_ipi_probe(struct platform_device *pdev)
>  	struct zynqmp_ipi_mbox *mbox;
>  	int num_mboxes, ret = -EINVAL;
>  
> -	num_mboxes = of_get_child_count(np);
> +	num_mboxes = of_get_available_child_count(np);
> +	if (num_mboxes == 0) {
> +		dev_err(dev, "mailbox nodes not available\n");
> +		return -EINVAL;
> +	}
> +

This patchset looks good now.  I'll queue it once I get an ack from Michal.

Thanks,
Mathieu

>  	pdata = devm_kzalloc(dev, struct_size(pdata, ipi_mboxes, num_mboxes),
>  			     GFP_KERNEL);
>  	if (!pdata)
> -- 
> 2.25.1
>