[PATCH v5 08/20] vfio: Refactor vfio_device_fops_cdev_open()

[Vipin Sharma]

Refactor vfio_device_fops_cdev_open() to use a static helper
vfio_device_cdev_open(). This helper will be used in subsequent
patches to support opening the device file during Live Update restore.

No functional change intended.

Signed-off-by: Vipin Sharma <vipinsh at google.com>
---
 drivers/vfio/device_cdev.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/vfio/device_cdev.c b/drivers/vfio/device_cdev.c
index 54abf312cf04..2231423fe56d 100644
--- a/drivers/vfio/device_cdev.c
+++ b/drivers/vfio/device_cdev.c
@@ -16,14 +16,8 @@ void vfio_init_device_cdev(struct vfio_device *device)
 	device->cdev.owner = THIS_MODULE;
 }
 
-/*
- * device access via the fd opened by this function is blocked until
- * .open_device() is called successfully during BIND_IOMMUFD.
- */
-int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep)
+static int vfio_device_cdev_open(struct vfio_device *device, struct file *file)
 {
-	struct vfio_device *device = container_of(inode->i_cdev,
-						  struct vfio_device, cdev);
 	struct vfio_device_file *df;
 	int ret;
 
@@ -37,14 +31,14 @@ int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep)
 		goto err_put_registration;
 	}
 
-	filep->private_data = df;
+	file->private_data = df;
 
 	/*
 	 * Use the pseudo fs inode on the device to link all mmaps
 	 * to the same address space, allowing us to unmap all vmas
 	 * associated to this device using unmap_mapping_range().
 	 */
-	filep->f_mapping = device->inode->i_mapping;
+	file->f_mapping = device->inode->i_mapping;
 
 	return 0;
 
@@ -53,6 +47,18 @@ int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep)
 	return ret;
 }
 
+/*
+ * device access via the fd opened by this function is blocked until
+ * .open_device() is called successfully during BIND_IOMMUFD.
+ */
+int vfio_device_fops_cdev_open(struct inode *inode, struct file *file)
+{
+	struct vfio_device *device = container_of(inode->i_cdev,
+						  struct vfio_device, cdev);
+
+	return vfio_device_cdev_open(device, file);
+}
+
 static void vfio_df_get_kvm_safe(struct vfio_device_file *df)
 {
 	spin_lock(&df->kvm_ref_lock);
-- 
2.55.0.795.g602f6c329a-goog