diff --git a/[refs] b/[refs]
index 00afc5440cd8..c8a428bb7ba8 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 864fe51671c9e44fb9d02765623daac9acc26a8b
+refs/heads/master: 52e7c5e08201e20ddbe93cb1977869c38072bc2f
diff --git a/trunk/arch/mips/basler/excite/excite_iodev.c b/trunk/arch/mips/basler/excite/excite_iodev.c
index 476d20e08d0e..a1e3526b4a94 100644
--- a/trunk/arch/mips/basler/excite/excite_iodev.c
+++ b/trunk/arch/mips/basler/excite/excite_iodev.c
@@ -26,6 +26,7 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/miscdevice.h>
+#include <linux/smp_lock.h>
 
 #include "excite_iodev.h"
 
@@ -110,8 +111,14 @@ static int __exit iodev_remove(struct device *dev)
 
 static int iodev_open(struct inode *i, struct file *f)
 {
-	return request_irq(iodev_irq, iodev_irqhdl, IRQF_DISABLED,
+	int ret;
+
+	lock_kernel();
+	ret = request_irq(iodev_irq, iodev_irqhdl, IRQF_DISABLED,
 			   iodev_name, &miscdev);
+	unlock_kernel();
+
+	return ret;
 }
 
 static int iodev_release(struct inode *i, struct file *f)