Re: [PATCH 2/2] mailbox: qcom-ipcc: amend qcom_ipcc_irq_fn() to report errors

[Brian Masney <bmasney@redhat.com>]

On Mon, Mar 16, 2026 at 11:26:18AM +0100, Gabriele Paoloni wrote:
> check the virq value returned by irq_find_mapping(), also
> check the return value of generic_handle_irq(); return IRQ_NONE
> if either of the checks fails.
> 
> Signed-off-by: Gabriele Paoloni <gpaoloni@redhat.com>
> ---
>  drivers/mailbox/qcom-ipcc.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
> index c23efaaa64a1..0795184591f0 100644
> --- a/drivers/mailbox/qcom-ipcc.c
> +++ b/drivers/mailbox/qcom-ipcc.c
> @@ -75,7 +75,7 @@ static irqreturn_t qcom_ipcc_irq_fn(int irq, void *data)
>  {
>  	struct qcom_ipcc *ipcc = data;
>  	u32 hwirq;
> -	int virq;
> +	int virq, ret;

Put variables in reverse Christmas tree order.

Brian


>  
>  	for (;;) {
>  		hwirq = readl(ipcc->base + IPCC_REG_RECV_ID);
> @@ -83,8 +83,14 @@ static irqreturn_t qcom_ipcc_irq_fn(int irq, void *data)
>  			break;
>  
>  		virq = irq_find_mapping(ipcc->irq_domain, hwirq);
> +		if (unlikely(!virq))
> +			return IRQ_NONE;
> +
>  		writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_CLEAR);
> -		generic_handle_irq(virq);
> +
> +		ret = generic_handle_irq(virq);
> +		if (unlikely(ret))
> +			return IRQ_NONE;
>  	}
>  
>  	return IRQ_HANDLED;
> -- 
> 2.48.1
>