[media] em28xx-v4l: simplify em28xx_v4l2_open() by using v4l2_fh_open()

Instead of calling

...
struct v4l2_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
filp->private_data = fh;
v4l2_fh_init(fh, vdev);
v4l2_fh_add(fh);
...

simply use function v4l2_fh_open() which does all of these calls for us.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/usb/em28xx/em28xx-video.c b/drivers/media/usb/em28xx/em28xx-video.c
index 4eb4a6a..3a7ec3b 100644 (file)
--- a/drivers/media/usb/em28xx/em28xx-video.c
+++ b/drivers/media/usb/em28xx/em28xx-video.c
@@ -1868,7 +1868,7 @@ static int em28xx_v4l2_open(struct file *filp)
        struct em28xx *dev = video_drvdata(filp);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        enum v4l2_buf_type fh_type = 0;
-       struct v4l2_fh *fh;
+       int ret;
 
        switch (vdev->vfl_type) {
        case VFL_TYPE_GRABBER:
@@ -1889,14 +1889,14 @@ static int em28xx_v4l2_open(struct file *filp)
 
        if (mutex_lock_interruptible(&dev->lock))
                return -ERESTARTSYS;
-       fh = kzalloc(sizeof(struct v4l2_fh), GFP_KERNEL);
-       if (!fh) {
-               em28xx_errdev("em28xx-video.c: Out of memory?!\n");
+
+       ret = v4l2_fh_open(filp);
+       if (ret) {
+               em28xx_errdev("%s: v4l2_fh_open() returned error %d\n",
+                             __func__, ret);
                mutex_unlock(&dev->lock);
-               return -ENOMEM;
+               return ret;
        }
-       v4l2_fh_init(fh, vdev);
-       filp->private_data = fh;
 
        if (v4l2->users == 0) {
                em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
@@ -1921,7 +1921,6 @@ static int em28xx_v4l2_open(struct file *filp)
        v4l2->users++;
 
        mutex_unlock(&dev->lock);
-       v4l2_fh_add(fh);
 
        return 0;
 }