1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index b3518ca9f04e..ab2b769c83ca 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -29,6 +29,7 @@
 #include <linux/errno.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/spidev.h>
@@ -393,6 +394,7 @@ static int spidev_open(struct inode *inode, struct file *filp)
         struct spidev_data      *spidev;
         int                     status = -ENXIO;
 
+        lock_kernel();
         mutex_lock(&device_list_lock);
 
         list_for_each_entry(spidev, &device_list, device_entry) {
@@ -418,6 +420,7 @@ static int spidev_open(struct inode *inode, struct file *filp)
                 pr_debug("spidev: nothing for minor %d\n", iminor(inode));
 
         mutex_unlock(&device_list_lock);
+        unlock_kernel();
         return status;
 }