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irqchip/sifive-plic: Skip contexts except supervisor in plic_init()
Modify plic_init() to skip .dts interrupt contexts other than supervisor external interrupt. The .dts entry for plic may specify multiple interrupt contexts. For example, it may assign two entries IRQ_M_EXT and IRQ_S_EXT, in that order, to the same interrupt controller. This patch modifies plic_init() to skip the IRQ_M_EXT context since IRQ_S_EXT is currently the only supported context. If IRQ_M_EXT is not skipped, plic_init() will report "handler already present for context" when it comes across the IRQ_S_EXT context in the next iteration of its loop. Without this patch, .dts would have to be edited to replace the value of IRQ_M_EXT with -1 for it to be skipped. Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # arch/riscv Link: https://lkml.kernel.org/r/1571933503-21504-1-git-send-email-alan.mikhak@sifive.com
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1 changed files with 2 additions and 2 deletions
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@ -251,8 +251,8 @@ static int __init plic_init(struct device_node *node,
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continue;
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}
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/* skip context holes */
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if (parent.args[0] == -1)
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/* skip contexts other than supervisor external interrupt */
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if (parent.args[0] != IRQ_S_EXT)
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continue;
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hartid = plic_find_hart_id(parent.np);
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