V4L/DVB: V4L: File handles

This patch adds a list of v4l2_fh structures to every video_device.
It allows using file handle related information in V4L2. The event interface
is one example of such use.

The use of v4l2_fh is not mandatory for drivers.

Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 709069916068..65a7b30524ca 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -421,6 +421,10 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
         if (!vdev->release)
                 return -EINVAL;
 
+        /* v4l2_fh support */
+        spin_lock_init(&vdev->fh_lock);
+        INIT_LIST_HEAD(&vdev->fh_list);
+
         /* Part 1: check device type */
         switch (type) {
         case VFL_TYPE_GRABBER: