From: Yinghai Lu <yinghai@kernel.org>
Date: Sat, 27 Dec 2008 06:38:15 +0000 (-0800)
Subject: sparseirq: fix hang with !SPARSE_IRQ
X-Git-Tag: firefly_0821_release~16450^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=12026ea16a618b289fcf457661aed24f57323a20;p=firefly-linux-kernel-4.4.55.git

sparseirq: fix hang with !SPARSE_IRQ

Impact: fix hang

Suresh report his two sockets system only works with SPARSE_IRQ enable
it turns out we miss the setting desc->irq

so provide early_irq_init() even !SPARSE_IRQ to set desc->irq

Reported-by: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index e1cf4e391cae..157c04c3b158 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -218,6 +218,21 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
 	}
 };
 
+int __init early_irq_init(void)
+{
+	struct irq_desc *desc;
+	int count;
+	int i;
+
+	desc = irq_desc;
+	count = ARRAY_SIZE(irq_desc);
+
+	for (i = 0; i < count; i++)
+		desc[i].irq = i;
+
+	return arch_early_irq_init();
+}
+
 struct irq_desc *irq_to_desc(unsigned int irq)
 {
 	return (irq < NR_IRQS) ? irq_desc + irq : NULL;