[media] v4l2-dev.c: also add debug support for the fops

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index b82778174eef..d13c47fc7202 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -305,6 +305,9 @@ static ssize_t v4l2_read(struct file *filp, char __user *buf,
                 ret = vdev->fops->read(filp, buf, sz, off);
         if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
                 mutex_unlock(vdev->lock);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: read: %zd (%d)\n",
+                        video_device_node_name(vdev), sz, ret);
         return ret;
 }
 
@@ -323,6 +326,9 @@ static ssize_t v4l2_write(struct file *filp, const char __user *buf,
                 ret = vdev->fops->write(filp, buf, sz, off);
         if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
                 mutex_unlock(vdev->lock);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: write: %zd (%d)\n",
+                        video_device_node_name(vdev), sz, ret);
         return ret;
 }
 
@@ -339,6 +345,9 @@ static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll)
                 ret = vdev->fops->poll(filp, poll);
         if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
                 mutex_unlock(vdev->lock);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: poll: %08x\n",
+                        video_device_node_name(vdev), ret);
         return ret;
 }
 
@@ -403,12 +412,17 @@ static unsigned long v4l2_get_unmapped_area(struct file *filp,
                 unsigned long flags)
 {
         struct video_device *vdev = video_devdata(filp);
+        int ret;
 
         if (!vdev->fops->get_unmapped_area)
                 return -ENOSYS;
         if (!video_is_registered(vdev))
                 return -ENODEV;
-        return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
+        ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n",
+                        video_device_node_name(vdev), ret);
+        return ret;
 }
 #endif
 
@@ -426,6 +440,9 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
                 ret = vdev->fops->mmap(filp, vm);
         if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
                 mutex_unlock(vdev->lock);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: mmap (%d)\n",
+                        video_device_node_name(vdev), ret);
         return ret;
 }
 
@@ -464,6 +481,9 @@ err:
         /* decrease the refcount in case of an error */
         if (ret)
                 video_put(vdev);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: open (%d)\n",
+                        video_device_node_name(vdev), ret);
         return ret;
 }
 
@@ -483,6 +503,9 @@ static int v4l2_release(struct inode *inode, struct file *filp)
         /* decrease the refcount unconditionally since the release()
            return value is ignored. */
         video_put(vdev);
+        if (vdev->debug)
+                printk(KERN_DEBUG "%s: release\n",
+                        video_device_node_name(vdev));
         return ret;
 }