[PATCH] riscv: plic: Clear the associated bit of irq_claimed when writing CLAIM

[Vincent Chen]

When an IRQ number is written to the claim register, it means this IRQ
has been addressed. If this interrupt is still pending, PLIC should
clear the associated bit of irq_claimed to allow this interrupt to
be claimed again.

Signed-off-by: Vincent Chen <vincent.chen at sifive.com>
---
 riscv/plic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/riscv/plic.c b/riscv/plic.c
index 07cadc7..d677bbf 100644
--- a/riscv/plic.c
+++ b/riscv/plic.c
@@ -394,6 +394,9 @@ static void plic__context_write(struct plic_state *s,
 			irq_update = true;
 		break;
 	case CONTEXT_CLAIM:
+		val = ioport__read32(data);
+		if (val < plic.num_irq)
+			c->irq_claimed[val / 32] &= ~(1 << (val % 32));
 		break;
 	default:
 		irq_update = true;
-- 
2.32.0