x86/irq: Validate that irq descriptor is still active

[mirror_ubuntu-artful-kernel.git] / arch / x86 / kernel / irq.c

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index f8062aaf5df9c830ec287f6774ad270e13d34b32..c0b58dd1ca042fd853e5c23198f118d8c5b28261 100644 (file)
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -470,6 +470,15 @@ void fixup_irqs(void)
                }
 
                chip = irq_data_get_irq_chip(data);
+               /*
+                * The interrupt descriptor might have been cleaned up
+                * already, but it is not yet removed from the radix tree
+                */
+               if (!chip) {
+                       raw_spin_unlock(&desc->lock);
+                       continue;
+               }
+
                if (!irqd_can_move_in_process_context(data) && chip->irq_mask)
                        chip->irq_mask(data);