[tip: irq/urgent] irqchip/sifive-plic: Fix frozen interrupt due to affinity setting

[tip-bot2 for Nam Cao]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     1072020685f4b81f6efad3b412cdae0bd62bb043
Gitweb:        https://git.kernel.org/tip/1072020685f4b81f6efad3b412cdae0bd62bb043
Author:        Nam Cao <namcao@xxxxxxxxxxxxx>
AuthorDate:    Thu, 12 Feb 2026 12:41:25 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxx>
CommitterDate: Tue, 17 Feb 2026 11:00:43 +01:00

irqchip/sifive-plic: Fix frozen interrupt due to affinity setting

PLIC ignores interrupt completion message for disabled interrupt, explained
by the specification:

    The PLIC signals it has completed executing an interrupt handler by
    writing the interrupt ID it received from the claim to the
    claim/complete register. The PLIC does not check whether the completion
    ID is the same as the last claim ID for that target. If the completion
    ID does not match an interrupt source that is currently enabled for
    the target, the completion is silently ignored.

This caused problems in the past, because an interrupt can be disabled
while still being handled and plic_irq_eoi() had no effect. That was fixed
by checking if the interrupt is disabled, and if so enable it, before
sending the completion message. That check is done with irqd_irq_disabled().

However, that is not sufficient because the enable bit for the handling
hart can be zero despite irqd_irq_disabled(d) being false. This can happen
when affinity setting is changed while a hart is still handling the
interrupt.

This problem is easily reproducible by dumping a large file to uart (which
generates lots of interrupts) and at the same time keep changing the uart
interrupt's affinity setting. The uart port becomes frozen almost
instantaneously.

Fix this by checking PLIC's enable bit instead of irqd_irq_disabled().

Fixes: cc9f04f9a84f ("irqchip/sifive-plic: Implement irq_set_affinity() for SMP host")
Signed-off-by: Nam Cao <namcao@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
Link: https://patch.msgid.link/20260212114125.3148067-1-namcao@xxxxxxxxxxxxx
---
 drivers/irqchip/irq-sifive-plic.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 60fd8f9..7005887 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -172,8 +172,13 @@ static void plic_irq_disable(struct irq_data *d)
 static void plic_irq_eoi(struct irq_data *d)
 {
 	struct plic_handler *handler = this_cpu_ptr(&plic_handlers);
+	u32 __iomem *reg;
+	bool enabled;
+
+	reg = handler->enable_base + (d->hwirq / 32) * sizeof(u32);
+	enabled = readl(reg) & BIT(d->hwirq % 32);
 
-	if (unlikely(irqd_irq_disabled(d))) {
+	if (unlikely(!enabled)) {
 		plic_toggle(handler, d->hwirq, 1);
 		writel(d->hwirq, handler->hart_base + CONTEXT_CLAIM);
 		plic_toggle(handler, d->hwirq, 0);