diff options
Diffstat (limited to 'drivers/char/xilinx_hwicap/xilinx_hwicap.c')
| -rw-r--r-- | drivers/char/xilinx_hwicap/xilinx_hwicap.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/char/xilinx_hwicap/xilinx_hwicap.c b/drivers/char/xilinx_hwicap/xilinx_hwicap.c index 3edf1fc12963..1e1b81e57cdc 100644 --- a/drivers/char/xilinx_hwicap/xilinx_hwicap.c +++ b/drivers/char/xilinx_hwicap/xilinx_hwicap.c @@ -85,6 +85,7 @@ #include <linux/poll.h> #include <linux/proc_fs.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <linux/sysctl.h> #include <linux/version.h> #include <linux/fs.h> @@ -504,11 +505,12 @@ static int hwicap_open(struct inode *inode, struct file *file) struct hwicap_drvdata *drvdata; int status; + lock_kernel(); drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev); status = mutex_lock_interruptible(&drvdata->sem); if (status) - return status; + goto out; if (drvdata->is_open) { status = -EBUSY; @@ -528,6 +530,8 @@ static int hwicap_open(struct inode *inode, struct file *file) error: mutex_unlock(&drvdata->sem); + out: + unlock_kernel(); return status; } |