LoongArch: Mask all interrupts during kexec/kdump

[ Upstream commit 863a320 ]

If the default state of the interrupt controllers in the first kernel
don't mask any interrupts, it may cause the second kernel to potentially
receive interrupts (which were previously allocated by the first kernel)
immediately after a CPU becomes online during its boot process. These
interrupts cannot be properly routed, leading to bad IRQ issues.

This patch calls machine_kexec_mask_interrupts() to mask all interrupts
during the kexec/kdump process.

Signed-off-by: Tianyang Zhang <zhangtianyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: chenhuacai

arch/loongarch/kernel/machine_kexec.c

@@ -249,6 +249,7 @@ void machine_crash_shutdown(struct pt_regs *regs)
 #ifdef CONFIG_SMP
 	crash_smp_send_stop();
 #endif
+	machine_kexec_mask_interrupts();
 	cpumask_set_cpu(crashing_cpu, &cpus_in_crash);
 
 	pr_info("Starting crashdump kernel...\n");
@@ -286,6 +287,7 @@ void machine_kexec(struct kimage *image)
 
 	/* We do not want to be bothered. */
 	local_irq_disable();
+	machine_kexec_mask_interrupts();
 
 	pr_notice("EFI boot flag 0x%lx\n", efi_boot);
 	pr_notice("Command line at 0x%lx\n", cmdline_ptr);