1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index a1039068f95c..415fab0125ac 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -222,11 +222,16 @@ bool check_syscall_vector(struct lguest *lg)
 int init_interrupts(void)
 {
         /* If they want some strange system call vector, reserve it now */
-        if (syscall_vector != SYSCALL_VECTOR
-            && test_and_set_bit(syscall_vector, used_vectors)) {
-                printk("lg: couldn't reserve syscall %u\n", syscall_vector);
-                return -EBUSY;
+        if (syscall_vector != SYSCALL_VECTOR) {
+                if (test_bit(syscall_vector, used_vectors) ||
+                    vector_used_by_percpu_irq(syscall_vector)) {
+                        printk(KERN_ERR "lg: couldn't reserve syscall %u\n",
+                                 syscall_vector);
+                        return -EBUSY;
+                }
+                set_bit(syscall_vector, used_vectors);
         }
+
         return 0;
 }