V4L/DVB (13552): v4l: Replace video_is_unregistered with video_is_registered

Replace the video_is_unregistered function by a video_is_registered
function. The V4L2_FL_UNREGISTERED flag is replaced by a
V4L2_FL_REGISTERED flag.

This change makes the video_is_registered function return coherent
results when called on an initialize but not yet registered video_device
instance. The function can now be used instead of checking
video_device::minor.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 10 insertions, 10 deletions

diff --git a/drivers/media/video/hdpvr/hdpvr-video.c b/drivers/media/video/hdpvr/hdpvr-video.c
index b5439cabb381..fdd782039e9d 100644
--- a/drivers/media/video/hdpvr/hdpvr-video.c
+++ b/drivers/media/video/hdpvr/hdpvr-video.c
@@ -523,7 +523,7 @@ static unsigned int hdpvr_poll(struct file *filp, poll_table *wait)
 
         mutex_lock(&dev->io_mutex);
 
-        if (video_is_unregistered(dev->video_dev)) {
+        if (!video_is_registered(dev->video_dev)) {
                 mutex_unlock(&dev->io_mutex);
                 return -EIO;
         }
diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index aa3e0f9aa3bf..709069916068 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -189,7 +189,7 @@ static ssize_t v4l2_read(struct file *filp, char __user *buf,
 
         if (!vdev->fops->read)
                 return -EINVAL;
-        if (video_is_unregistered(vdev))
+        if (!video_is_registered(vdev))
                 return -EIO;
         return vdev->fops->read(filp, buf, sz, off);
 }
@@ -201,7 +201,7 @@ static ssize_t v4l2_write(struct file *filp, const char __user *buf,
 
         if (!vdev->fops->write)
                 return -EINVAL;
-        if (video_is_unregistered(vdev))
+        if (!video_is_registered(vdev))
                 return -EIO;
         return vdev->fops->write(filp, buf, sz, off);
 }
@@ -210,7 +210,7 @@ static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll)
 {
         struct video_device *vdev = video_devdata(filp);
 
-        if (!vdev->fops->poll || video_is_unregistered(vdev))
+        if (!vdev->fops->poll || !video_is_registered(vdev))
                 return DEFAULT_POLLMASK;
         return vdev->fops->poll(filp, poll);
 }
@@ -250,7 +250,7 @@ static unsigned long v4l2_get_unmapped_area(struct file *filp,
 
         if (!vdev->fops->get_unmapped_area)
                 return -ENOSYS;
-        if (video_is_unregistered(vdev))
+        if (!video_is_registered(vdev))
                 return -ENODEV;
         return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
 }
@@ -260,8 +260,7 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
 {
         struct video_device *vdev = video_devdata(filp);
 
-        if (!vdev->fops->mmap ||
-            video_is_unregistered(vdev))
+        if (!vdev->fops->mmap || !video_is_registered(vdev))
                 return -ENODEV;
         return vdev->fops->mmap(filp, vm);
 }
@@ -277,7 +276,7 @@ static int v4l2_open(struct inode *inode, struct file *filp)
         vdev = video_devdata(filp);
         /* return ENODEV if the video device has been removed
            already or if it is not registered anymore. */
-        if (vdev == NULL || video_is_unregistered(vdev)) {
+        if (vdev == NULL || !video_is_registered(vdev)) {
                 mutex_unlock(&videodev_lock);
                 return -ENODEV;
         }
@@ -555,6 +554,7 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
                         name_base, nr, video_device_node_name(vdev));
 
         /* Part 5: Activate this minor. The char device can now be used. */
+        set_bit(V4L2_FL_REGISTERED, &vdev->flags);
         mutex_lock(&videodev_lock);
         video_device[vdev->minor] = vdev;
         mutex_unlock(&videodev_lock);
@@ -593,11 +593,11 @@ EXPORT_SYMBOL(video_register_device_no_warn);
 void video_unregister_device(struct video_device *vdev)
 {
         /* Check if vdev was ever registered at all */
-        if (!vdev || vdev->minor < 0)
+        if (!vdev || !video_is_registered(vdev))
                 return;
 
         mutex_lock(&videodev_lock);
-        set_bit(V4L2_FL_UNREGISTERED, &vdev->flags);
+        clear_bit(V4L2_FL_REGISTERED, &vdev->flags);
         mutex_unlock(&videodev_lock);
         device_unregister(&vdev->dev);
 }