xen/smp: Set the per-cpu IRQ number to a valid default.

When we free it we want to make sure to set it to a default
value of -1 so that we don't double-free it (in case somebody
calls us twice).

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index f5b29ec..6a483cd 100644 (file)
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -43,10 +43,10 @@ struct xen_common_irq {
        int irq;
        char *name;
 };
-static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq);
-static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq);
-static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq);
-static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work);
+static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
 static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
 
 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
@@ -104,20 +104,30 @@ static void __cpuinit cpu_bringup_and_idle(void)
 
 static void xen_smp_intr_free(unsigned int cpu)
 {
-       if (per_cpu(xen_resched_irq, cpu).irq >= 0)
+       if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
                unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
-       if (per_cpu(xen_callfunc_irq, cpu).irq >= 0)
+               per_cpu(xen_resched_irq, cpu).irq = -1;
+       }
+       if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
                unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
-       if (per_cpu(xen_debug_irq, cpu).irq >= 0)
+               per_cpu(xen_callfunc_irq, cpu).irq = -1;
+       }
+       if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
                unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
-       if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0)
+               per_cpu(xen_debug_irq, cpu).irq = -1;
+       }
+       if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
                unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
                                       NULL);
+               per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
+       }
        if (xen_hvm_domain())
                return;
 
-       if (per_cpu(xen_irq_work, cpu).irq >= 0)
+       if (per_cpu(xen_irq_work, cpu).irq >= 0) {
                unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
+               per_cpu(xen_irq_work, cpu).irq = -1;
+       }
 };
 static int xen_smp_intr_init(unsigned int cpu)
 {