[PATCH] irqchip/riscv-imsic: Report successful hardware retrigger

[Avi Weiss]

imsic_irq_retrigger() writes to the IMSIC MSI register to retrigger
an interrupt, but returns 0. The IRQ core treats zero as failure and
may schedule a software resend despite the hardware retrigger.

Return 1 after the MSI write to report successful hardware
retriggering and prevent the unnecessary software resend.

Fixes: 027e125acdba ("irqchip/riscv-imsic: Add device MSI domain support for platform devices")
Signed-off-by: Avi Weiss <thnkslprpt@xxxxxxxxx>
---
 drivers/irqchip/irq-riscv-imsic-platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
index 95ff76e63a69..5f72b2a80887 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -61,7 +61,7 @@ static int imsic_irq_retrigger(struct irq_data *d)
 
 	local = per_cpu_ptr(imsic->global.local, vec->cpu);
 	writel_relaxed(vec->local_id, local->msi_va);
-	return 0;
+	return 1;
 }
 
 static void imsic_irq_ack(struct irq_data *d)

base-commit: 6b4b543fa18757297ac756a6fe6e64f506b7844a
-- 
2.43.0