irqchip/irq-sifive-plic: Check and continue in case of an invalid cpuid.

atishp04 · Marc Zyngier · commit fc03acaeab35 · 2019-02-14T12:24:34.000Z
riscv_hartid_to_cpuid can return invalid cpuid for a hart that is
present in DT but was never brought up.

Print the appropriate warning message and continue.

Signed-off-by: Atish Patra &lt;atish.patra@wdc.com&gt;
Reviewed-by: Anup Patel &lt;anup@brainfault.org&gt;
Reviewed-by: Christoph Hellwig &lt;hch@lst.de&gt;
Signed-off-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
@@ -237,6 +237,11 @@ static int __init plic_init(struct device_node *node,
 		}
 
 		cpu = riscv_hartid_to_cpuid(hartid);
+		if (cpu < 0) {
+			pr_warn("Invalid cpuid for context %d\n", i);
+			continue;
+		}
+
 		handler = per_cpu_ptr(&plic_handlers, cpu);
 		handler->present = true;
 		handler->ctxid = i;
