diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
index 68cd05b6d829d1f3b7fa15f256f78b3bb6f82f82..85cc7710193c7bfe224bfa08f3a8b1df8f66295f 100644
--- a/drivers/misc/cb710/core.c
+++ b/drivers/misc/cb710/core.c
@@ -245,6 +245,7 @@ static int __devinit cb710_probe(struct pci_dev *pdev,
 	if (err)
 		return err;
 
+	spin_lock_init(&chip->irq_lock);
 	chip->pdev = pdev;
 	chip->iobase = pcim_iomap_table(pdev)[0];