Re: [PATCH v4 1/5] mailbox: zynqmp: fix counts of child nodes

[Michal Simek]

On 2/28/23 22:02, 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.
>
> Signed-off-by: Tanmay Shah <tanmay.shah@xxxxxxx>
> ---
>   drivers/mailbox/zynqmp-ipi-mailbox.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
> index 12e004ff1a14..e287ed7a92ce 100644
> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
> @@ -634,7 +634,7 @@ 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);
>   	pdata = devm_kzalloc(dev, sizeof(*pdata) + (num_mboxes * sizeof(*mbox)),
>   			     GFP_KERNEL);
>   	if (!pdata)

I think it will be good to also check that num_mboxes is != 0.

M