diff options
| -rw-r--r-- | arch/blackfin/mach-bf561/coreb.c | 4 |
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; } |