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| author | Alan Mikhak <alan.mikhak@sifive.com> | 2019-10-24 09:11:43 -0700 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2019-10-25 11:48:13 +0100 |
| commit | 41860cc447045c811ce6d5a92f93a065a691fe8e (patch) | |
| tree | 0b6d84b4dd0c2ad5b9c7c7a5358e1771ac40b087 /drivers | |
| parent | 8424312516e5d9baeeb0a95d0e4523579b7aa395 (diff) | |
| download | linux-stable-41860cc447045c811ce6d5a92f93a065a691fe8e.tar.gz linux-stable-41860cc447045c811ce6d5a92f93a065a691fe8e.tar.bz2 linux-stable-41860cc447045c811ce6d5a92f93a065a691fe8e.zip | |
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/irqchip/irq-sifive-plic.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index 3e51deedbcc8..b1a33f97db03 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -251,8 +251,8 @@ static int __init plic_init(struct device_node *node, continue; } - /* skip context holes */ - if (parent.args[0] == -1) + /* skip contexts other than supervisor external interrupt */ + if (parent.args[0] != IRQ_S_EXT) continue; hartid = plic_find_hart_id(parent.np); |