diff options
Diffstat (limited to 'drivers/fpga/dfl-afu-main.c')
| -rw-r--r-- | drivers/fpga/dfl-afu-main.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c index 65437b6a6842..435bde40f361 100644 --- a/drivers/fpga/dfl-afu-main.c +++ b/drivers/fpga/dfl-afu-main.c @@ -561,14 +561,16 @@ static int afu_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 = fdev; + 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 = fdev; + } + mutex_unlock(&pdata->lock); - return 0; + return ret; } static int afu_release(struct inode *inode, struct file *filp) @@ -581,12 +583,14 @@ static int afu_release(struct inode *inode, struct file *filp) pdata = dev_get_platdata(&pdev->dev); mutex_lock(&pdata->lock); - __port_reset(pdev); - afu_dma_region_destroy(pdata); - mutex_unlock(&pdata->lock); - dfl_feature_dev_use_end(pdata); + if (!dfl_feature_dev_use_count(pdata)) { + __port_reset(pdev); + afu_dma_region_destroy(pdata); + } + mutex_unlock(&pdata->lock); + return 0; } |