irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable

commit 2c6c9c049510163090b979ea5f92a68ae8d93c45 upstream.

When a GIC local interrupt is not routable, it's vl_map will be used
to control some internal states for core (providing IPTI, IPPCI, IPFDC
input signal for core). Overriding it will interfere core's intetrupt
controller.

Do not touch vl_map if a local interrupt is not routable, we are not
going to remap it.

Before e7f42ea11176 (" irqchip/mips-gic: Get rid of the reliance on
irq_cpu_online()"), if a local interrupt is not routable, then it won't
be requested from GIC Local domain, and thus gic_all_vpes_irq_cpu_online
won't be called for that particular interrupt.

Fixes: e7f42ea11176 (" irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()")
Cc: stable@vger.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230424103156.66753-2-jiaxun.yang@flygoat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 1ba0f1555c8055173de241ec50f71f4bbaad721e..cc991dcce45446a5d04e52f4d6995d3497254441 100644 (file)
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -400,6 +400,8 @@ static void gic_all_vpes_irq_cpu_online(void)
                unsigned int intr = local_intrs[i];
                struct gic_all_vpes_chip_data *cd;
 
+               if (!gic_local_irq_is_routable(intr))
+                       continue;
                cd = &gic_all_vpes_chip_data[intr];
                write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
                if (cd->mask)