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From:   Atish Patra <atish.patra@wdc.com>
To:     linux-riscv@lists.infradead.org
Cc:     Atish Patra <atish.patra@wdc.com>,
        Alan Kao <alankao@andestech.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andreas Schwab <schwab@suse.de>,
        Anup Patel <anup@brainfault.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Dmitriy Cherkasov <dmitriy@oss-tech.org>,
        Jason Cooper <jason@lakedaemon.net>,
        Johan Hovold <johan@kernel.org>, linux-kernel@vger.kernel.org,
        Marc Zyngier <marc.zyngier@arm.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Rob Herring <robh@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: [v4 PATCH 7/8] irqchip/irq-sifive-plic: Check and continue in case of an invalid cpuid.
Date:   Tue, 12 Feb 2019 03:10:11 -0800
Message-Id: <1549969812-22502-8-git-send-email-atish.patra@wdc.com>
In-Reply-To: <1549969812-22502-1-git-send-email-atish.patra@wdc.com>
References: <1549969812-22502-1-git-send-email-atish.patra@wdc.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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 <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 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 357e9daf..254ecd76 100644
--- 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;
-- 
2.7.4