diff options
Diffstat (limited to 'drivers/fpga/dfl-fme-main.c')
| -rw-r--r-- | drivers/fpga/dfl-fme-main.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c index 1d4690c99268..56d720c1af39 100644 --- a/drivers/fpga/dfl-fme-main.c +++ b/drivers/fpga/dfl-fme-main.c @@ -600,14 +600,16 @@ static int fme_open(struct inode *inode, struct file *filp) if (WARN_ON(!pdata)) return -ENODEV; - ret = dfl_feature_dev_use_begin(pdata); - if (ret) - return ret; - - dev_dbg(&fdev->dev, "Device File Open\n"); - filp->private_data = pdata; + mutex_lock(&pdata->lock); + ret = dfl_feature_dev_use_begin(pdata, filp->f_flags & O_EXCL); + if (!ret) { + dev_dbg(&fdev->dev, "Device File Opened %d Times\n", + dfl_feature_dev_use_count(pdata)); + filp->private_data = pdata; + } + mutex_unlock(&pdata->lock); - return 0; + return ret; } static int fme_release(struct inode *inode, struct file *filp) @@ -616,7 +618,10 @@ static int fme_release(struct inode *inode, struct file *filp) struct platform_device *pdev = pdata->dev; dev_dbg(&pdev->dev, "Device File Release\n"); + + mutex_lock(&pdata->lock); dfl_feature_dev_use_end(pdata); + mutex_unlock(&pdata->lock); return 0; } |