[tip: irq/msi] irqchip/imx-intmux: Handle pure domain searches correctly

["tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>]

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

Commit-ID:     34da27aa8956d3a75c7556a59c9c7cfd0b3f18ab
Gitweb:        https://git.kernel.org/tip/34da27aa8956d3a75c7556a59c9c7cfd0b3f18ab
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Tue, 20 Feb 2024 09:46:19 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 20 Feb 2024 17:30:57 +01:00

irqchip/imx-intmux: Handle pure domain searches correctly

The removal of the paremeter count restriction in the core code to allow
pure domain token based select() decisions broke the IMX intmux select
callback as that unconditioally expects that there is a parameter.

Add the missing check for zero parameter count and the token match.

Fixes: de1ff306dcf4 ("genirq/irqdomain: Remove the param count restriction from select()")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/87ttm3ikok.ffs@tglx
---
 drivers/irqchip/irq-imx-intmux.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/irqchip/irq-imx-intmux.c b/drivers/irqchip/irq-imx-intmux.c
index aa041e4..65084c7 100644
--- a/drivers/irqchip/irq-imx-intmux.c
+++ b/drivers/irqchip/irq-imx-intmux.c
@@ -166,6 +166,10 @@ static int imx_intmux_irq_select(struct irq_domain *d, struct irq_fwspec *fwspec
 	if (fwspec->fwnode != d->fwnode)
 		return false;
 
+	/* Handle pure domain searches */
+	if (!fwspec->param_count)
+		return d->bus_token == bus_token;
+
 	return irqchip_data->chanidx == fwspec->param[1];
 }