1 files changed, 13 insertions, 8 deletions

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index cf4603ba866f..642d8805bc1b 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -856,18 +856,23 @@ static void __init lguest_init_IRQ(void)
 }
 
 /*
- * With CONFIG_SPARSE_IRQ, interrupt descriptors are allocated as-needed, so
- * rather than set them in lguest_init_IRQ we are called here every time an
- * lguest device needs an interrupt.
- *
- * FIXME: irq_alloc_desc_at() can fail due to lack of memory, we should
- * pass that up!
+ * Interrupt descriptors are allocated as-needed, but low-numbered ones are
+ * reserved by the generic x86 code.  So we ignore irq_alloc_desc_at if it
+ * tells us the irq is already used: other errors (ie. ENOMEM) we take
+ * seriously.
  */
-void lguest_setup_irq(unsigned int irq)
+int lguest_setup_irq(unsigned int irq)
 {
-        irq_alloc_desc_at(irq, 0);
+        int err;
+
+        /* Returns -ve error or vector number. */
+        err = irq_alloc_desc_at(irq, 0);
+        if (err < 0 && err != -EEXIST)
+                return err;
+
         irq_set_chip_and_handler_name(irq, &lguest_irq_controller,
                                       handle_level_irq, "level");
+        return 0;
 }
 
 /*