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SubjectRe: [PATCH v3 4/6] irqchip: sifive-plic: Add warning in plic_init() if handler already present
On Mon, Dec 17, 2018 at 11:58 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> 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.."

OK, I will re-phrase it.

>
> Otherwise this looks fine:
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Regards,
Anup

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