[irqchip: irq/irqchip-next] irqchip/loongson-liointc: Fix improper error handling in liointc_init()

[irqchip-bot for Liu Peibao]

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     4a60a3cdcf1875c965095eb9e22c3d12bbc5a53d
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/4a60a3cdcf1875c965095eb9e22c3d12bbc5a53d
Author:        Liu Peibao <liupeibao@xxxxxxxxxxx>
AuthorDate:    Fri, 04 Nov 2022 19:07:12 +08:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Sat, 26 Nov 2022 13:29:57 

irqchip/loongson-liointc: Fix improper error handling in liointc_init()

For cores less than 4, eg, loongson2k1000 with 2 cores, the
of_property_match_string() may return with an error value,
which causes that liointc could not work. At least isr0 is
what should be checked like previous commit b2c4c3969fd7
("irqchip/loongson-liointc: irqchip add 2.0 version") did.

Fixes: 0858ed035a85 ("irqchip/loongson-liointc: Add ACPI init support")
Signed-off-by: Liu Peibao <liupeibao@xxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221104110712.23300-1-liupeibao@xxxxxxxxxxx
---
 drivers/irqchip/irq-loongson-liointc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c
index 0da8716..c4584e2 100644
--- a/drivers/irqchip/irq-loongson-liointc.c
+++ b/drivers/irqchip/irq-loongson-liointc.c
@@ -207,10 +207,13 @@ static int liointc_init(phys_addr_t addr, unsigned long size, int revision,
 					"reg-names", core_reg_names[i]);
 
 			if (index < 0)
-				goto out_iounmap;
+				continue;
 
 			priv->core_isr[i] = of_iomap(node, index);
 		}
+
+		if (!priv->core_isr[0])
+			goto out_iounmap;
 	}
 
 	/* Setup IRQ domain */