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

[tip-bot2 for Zhipeng Wang]

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

Commit-ID:     7f9b59f3447ad278768ad775c1753f82e720798d
Gitweb:        https://git.kernel.org/tip/7f9b59f3447ad278768ad775c1753f82e720798d
Author:        Zhipeng Wang <zhipeng.wang_1@xxxxxxx>
AuthorDate:    Wed, 04 Nov 2026 16:37:49 +09:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxx>
CommitterDate: Sun, 08 Nov 2026 22:43:43 +01:00

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

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@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
Reviewed-by: Radu Rendec <radu@xxxxxxxxxx>
Link: https://patch.msgid.link/20261104073759.386777-2-Zhipeng.wang_1@xxxxxxxxxxx
---
 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 87b07f5..1b8d0c8 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);
 }