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-rw-r--r--arch/blackfin/mach-bf561/coreb.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/coreb.c b/arch/blackfin/mach-bf561/coreb.c
index 1b44e9e6dc3b..852647801a01 100644
--- a/arch/blackfin/mach-bf561/coreb.c
+++ b/arch/blackfin/mach-bf561/coreb.c
@@ -32,6 +32,7 @@
#include <linux/device.h>
#include <linux/ioport.h>
#include <linux/module.h>
+#include <linux/smp_lock.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <asm/dma.h>
@@ -196,6 +197,7 @@ static loff_t coreb_lseek(struct file *file, loff_t offset, int origin)
static int coreb_open(struct inode *inode, struct file *file)
{
+ lock_kernel();
spin_lock_irq(&coreb_lock);
if (coreb_status & COREB_IS_OPEN)
@@ -204,10 +206,12 @@ static int coreb_open(struct inode *inode, struct file *file)
coreb_status |= COREB_IS_OPEN;
spin_unlock_irq(&coreb_lock);
+ unlock_kernel();
return 0;
out_busy:
spin_unlock_irq(&coreb_lock);
+ unlock_kernel();
return -EBUSY;
}