[PATCH] x86/ioapic: fix the irq_2_pin mem leak when destroy_irq

[Chuansheng Liu <chuansheng.liu@intel.com>]

When destroying the irq, before free cfg, need to check
cfg->irq_2_pin and free it when it is not NULL.

Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
---
 arch/x86/kernel/apic/io_apic.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index c265593..a976ee3 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -201,6 +201,15 @@ static struct irq_pin_list *alloc_irq_pin_list(int node)
 	return kzalloc_node(sizeof(struct irq_pin_list), GFP_KERNEL, node);
 }
 
+static void free_irq_pin_list(struct irq_cfg *cfg)
+{
+	struct irq_pin_list *entry, *next;
+
+	for (entry = cfg->irq_2_pin; entry; entry = next) {
+		next = entry->next;
+		kfree(entry);
+	}
+}
 
 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
 static struct irq_cfg irq_cfgx[NR_IRQS_LEGACY];
@@ -276,6 +285,7 @@ static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
 	irq_set_chip_data(at, NULL);
 	free_cpumask_var(cfg->domain);
 	free_cpumask_var(cfg->old_domain);
+	free_irq_pin_list(cfg);
 	kfree(cfg);
 }
 
-- 
1.7.0.4