[PATCH] irqchip/imx-irqsteer: Call chained_irq_exit() on the handler error path

[Zhipeng.wang_1 at oss.nxp.com]

From: Zhipeng Wang <zhipeng.wang_1 at nxp.com>

A chained handler must pair every chained_irq_enter() with a
chained_irq_exit() before returning, so that the parent interrupt's flow
control is completed (EOI for fasteoi parents, unmask for level-triggered
parents). Skipping it leaves the parent interrupt unacknowledged, blocking
further interrupts multiplexed through that line.

When imx_irqsteer_get_hwirq_base() fails, the handler returned early
without calling chained_irq_exit(). Route the error path through the
existing chained_irq_exit() so the parent interrupt is always completed
before returning.

Fixes: 28528fca4908 ("irqchip/imx-irqsteer: Add multi output interrupts support")
Signed-off-by: Zhipeng Wang <zhipeng.wang_1 at nxp.com>
---
 drivers/irqchip/irq-imx-irqsteer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
index a2f0629b22a3..d305312e9575 100644
--- a/drivers/irqchip/irq-imx-irqsteer.c
+++ b/drivers/irqchip/irq-imx-irqsteer.c
@@ -154,7 +154,7 @@ static void imx_irqsteer_irq_handler(struct irq_desc *desc)
 	if (hwirq < 0) {
 		pr_warn("%s: unable to get hwirq base for irq %d\n",
 			__func__, irq);
-		return;
+		goto out;
 	}
 
 	for (i = 0; i < 2; i++, hwirq += 32) {
@@ -172,6 +172,7 @@ static void imx_irqsteer_irq_handler(struct irq_desc *desc)
 			generic_handle_domain_irq(data->domain, pos + hwirq);
 	}
 
+out:
 	chained_irq_exit(irq_desc_get_chip(desc), desc);
 }
 

base-commit: c0a27675eaf08255017b3cabc28c99c0cd71f468
prerequisite-patch-id: fe0cf9000b3f26c5115a2dd46fd2b762127b95a2
-- 
2.34.1