diff -Naur linux-2.6.18-rc2.orig/drivers/net/smc911x.c linux-2.6.18-rc2/drivers/net/smc911x.c
--- linux-2.6.18-rc2.orig/drivers/net/smc911x.c	2006-07-20 10:26:20.000000000 +0200
+++ linux-2.6.18-rc2/drivers/net/smc911x.c	2006-07-20 17:44:26.000000000 +0200
@@ -1092,6 +1092,7 @@
 	/* Spurious interrupt check */
 	if ((SMC_GET_IRQ_CFG() & (INT_CFG_IRQ_INT_ | INT_CFG_IRQ_EN_)) !=
 		(INT_CFG_IRQ_INT_ | INT_CFG_IRQ_EN_)) {
+		spin_unlock_irqrestore(&lp->lock, flags);
 		return IRQ_NONE;
 	}