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SubjectRe: [PATCH v3 4/6] irqchip: sifive-plic: Add warning in plic_init() if handler already present
On Fri, Nov 30, 2018 at 01:32:05PM +0530, Anup Patel wrote:
> We have two enteries (one for M-mode and another for S-mode) in the
> interrupts-extended DT property of PLIC DT node for each HART. It is
> expected that firmware/bootloader will set M-mode HWIRQ line of each
> HART to 0xffffffff (i.e. -1) in interrupts-extended DT property
> because Linux runs in S-mode only.
>
> If firmware/bootloader is buggy then it will not correctly update
> interrupts-extended DT property which might result in a plic_handler
> configured twice. This patch adds a warning in plic_init() if a
> plic_handler is already marked present. This warning provides us
> a hint about incorrectly updated interrupts-extended DT property.
>
> Signed-off-by: Anup Patel <anup@brainfault.org>
> ---
> drivers/irqchip/irq-sifive-plic.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> index d4433399eb89..3d4f205f8abe 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -234,6 +234,11 @@ static int __init plic_init(struct device_node *node,
>
> cpu = riscv_hartid_to_cpuid(hartid);
> handler = per_cpu_ptr(&plic_handlers, cpu);
> + if (handler->present) {
> + pr_warn("handler not available for context %d.\n", i);
> + continue;
> + }

Shouldn't this be something like "handler already present.."

Otherwise this looks fine:

Reviewed-by: Christoph Hellwig <hch@lst.de>

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