[PATCH 4.19 32/58] irqchip/mips-cpu: Set IPI domain parent chip

[Greg Kroah-Hartman]

From: Mathias Kresin <d...@kresin.me>

commit 599b3063adf4bf041a87a69244ee36aded0d878f upstream.

Since commit 55567976629e ("genirq/irqdomain: Allow partial trimming of
irq_data hierarchy") the irq_data chain is valided.

The irq_domain_trim_hierarchy() function doesn't consider the irq + ipi
domain hierarchy as valid, since the ipi domain has the irq domain set
as parent, but the parent domain has no chip set. Hence the boot ends in
a kernel panic.

Set the chip for the parent domain as it is done in the mips gic irq
driver, to have a valid irq_data chain.

Fixes: 3838a547fda2 ("irqchip: mips-cpu: Introduce IPI IRQ domain support")
Cc: <sta...@vger.kernel.org> # v5.10+
Signed-off-by: Mathias Kresin <d...@kresin.me>
Signed-off-by: Marc Zyngier <m...@kernel.org>
Link: https://lore.kernel.org/r/20210107213603.1637781-1-...@kresin.me
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/irqchip/irq-mips-cpu.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/irqchip/irq-mips-cpu.c
+++ b/drivers/irqchip/irq-mips-cpu.c
@@ -201,6 +201,13 @@ static int mips_cpu_ipi_alloc(struct irq
                if (ret)
                        return ret;
 
+               ret = irq_domain_set_hwirq_and_chip(domain->parent, virq + i, 
hwirq,
+                                                   &mips_mt_cpu_irq_controller,
+                                                   NULL);
+
+               if (ret)
+                       return ret;
+
                ret = irq_set_irq_type(virq + i, IRQ_TYPE_LEVEL_HIGH);
                if (ret)
                        return ret;