[media] ivtv: replace ugly casts with a proper container_of

ivtv-ioctl cast the 'void *fh' directly to 'ivtv_open_id *'. This should be
done properly with a contained_of since the 'void *fh' is really a
'struct v4l2_fh *'.

It worked because the v4l2_fh field is also the first field in the ivtv_open_id
struct, but it is not clean code.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 50 insertions, 50 deletions

diff --git a/drivers/media/video/ivtv/ivtv-ioctl.c b/drivers/media/video/ivtv/ivtv-ioctl.c
index b443c03d21de..1689783cd19a 100644
--- a/drivers/media/video/ivtv/ivtv-ioctl.c
+++ b/drivers/media/video/ivtv/ivtv-ioctl.c
@@ -313,7 +313,7 @@ static int ivtv_video_command(struct ivtv *itv, struct ivtv_open_id *id,
 
 static int ivtv_g_fmt_sliced_vbi_out(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         struct v4l2_sliced_vbi_format *vbifmt = &fmt->fmt.sliced;
 
         vbifmt->reserved[0] = 0;
@@ -334,7 +334,7 @@ static int ivtv_g_fmt_sliced_vbi_out(struct file *file, void *fh, struct v4l2_fo
 
 static int ivtv_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
 
@@ -358,7 +358,7 @@ static int ivtv_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f
 
 static int ivtv_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         struct v4l2_vbi_format *vbifmt = &fmt->fmt.vbi;
 
         vbifmt->sampling_rate = 27000000;
@@ -377,7 +377,7 @@ static int ivtv_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f
 static int ivtv_g_fmt_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
         struct v4l2_sliced_vbi_format *vbifmt = &fmt->fmt.sliced;
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
 
         vbifmt->reserved[0] = 0;
@@ -398,7 +398,7 @@ static int ivtv_g_fmt_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_fo
 
 static int ivtv_g_fmt_vid_out(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
 
@@ -439,7 +439,7 @@ static int ivtv_g_fmt_vid_out(struct file *file, void *fh, struct v4l2_format *f
 
 static int ivtv_g_fmt_vid_out_overlay(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         struct v4l2_window *winfmt = &fmt->fmt.win;
 
         if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
@@ -463,7 +463,7 @@ static int ivtv_try_fmt_sliced_vbi_out(struct file *file, void *fh, struct v4l2_
 
 static int ivtv_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         int w = fmt->fmt.pix.width;
         int h = fmt->fmt.pix.height;
@@ -492,7 +492,7 @@ static int ivtv_try_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format
 static int ivtv_try_fmt_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
         struct v4l2_sliced_vbi_format *vbifmt = &fmt->fmt.sliced;
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
 
         if (id->type == IVTV_DEC_STREAM_TYPE_VBI)
@@ -512,7 +512,7 @@ static int ivtv_try_fmt_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_
 
 static int ivtv_try_fmt_vid_out(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         s32 w = fmt->fmt.pix.width;
         s32 h = fmt->fmt.pix.height;
         int field = fmt->fmt.pix.field;
@@ -546,7 +546,7 @@ static int ivtv_try_fmt_vid_out(struct file *file, void *fh, struct v4l2_format
 
 static int ivtv_try_fmt_vid_out_overlay(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         u32 chromakey = fmt->fmt.win.chromakey;
         u8 global_alpha = fmt->fmt.win.global_alpha;
 
@@ -565,7 +565,7 @@ static int ivtv_s_fmt_sliced_vbi_out(struct file *file, void *fh, struct v4l2_fo
 
 static int ivtv_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct v4l2_mbus_framefmt mbus_fmt;
         int ret = ivtv_try_fmt_vid_cap(file, fh, fmt);
@@ -594,7 +594,7 @@ static int ivtv_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f
 
 static int ivtv_s_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (!ivtv_raw_vbi(itv) && atomic_read(&itv->capturing) > 0)
                 return -EBUSY;
@@ -607,7 +607,7 @@ static int ivtv_s_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f
 static int ivtv_s_fmt_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 {
         struct v4l2_sliced_vbi_format *vbifmt = &fmt->fmt.sliced;
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         int ret = ivtv_try_fmt_sliced_vbi_cap(file, fh, fmt);
 
@@ -625,7 +625,7 @@ static int ivtv_s_fmt_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_fo
 
 static int ivtv_s_fmt_vid_out(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct yuv_playback_info *yi = &itv->yuv_info;
         int ret = ivtv_try_fmt_vid_out(file, fh, fmt);
@@ -670,7 +670,7 @@ static int ivtv_s_fmt_vid_out(struct file *file, void *fh, struct v4l2_format *f
 
 static int ivtv_s_fmt_vid_out_overlay(struct file *file, void *fh, struct v4l2_format *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         int ret = ivtv_try_fmt_vid_out_overlay(file, fh, fmt);
 
         if (ret == 0) {
@@ -683,7 +683,7 @@ static int ivtv_s_fmt_vid_out_overlay(struct file *file, void *fh, struct v4l2_f
 
 static int ivtv_g_chip_ident(struct file *file, void *fh, struct v4l2_dbg_chip_ident *chip)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         chip->ident = V4L2_IDENT_NONE;
         chip->revision = 0;
@@ -727,7 +727,7 @@ static int ivtv_itvc(struct ivtv *itv, unsigned int cmd, void *arg)
 
 static int ivtv_g_register(struct file *file, void *fh, struct v4l2_dbg_register *reg)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (v4l2_chip_match_host(&reg->match))
                 return ivtv_itvc(itv, VIDIOC_DBG_G_REGISTER, reg);
@@ -739,7 +739,7 @@ static int ivtv_g_register(struct file *file, void *fh, struct v4l2_dbg_register
 
 static int ivtv_s_register(struct file *file, void *fh, struct v4l2_dbg_register *reg)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (v4l2_chip_match_host(&reg->match))
                 return ivtv_itvc(itv, VIDIOC_DBG_S_REGISTER, reg);
@@ -752,7 +752,7 @@ static int ivtv_s_register(struct file *file, void *fh, struct v4l2_dbg_register
 
 static int ivtv_querycap(struct file *file, void *fh, struct v4l2_capability *vcap)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         strlcpy(vcap->driver, IVTV_DRIVER_NAME, sizeof(vcap->driver));
         strlcpy(vcap->card, itv->card_name, sizeof(vcap->card));
@@ -764,14 +764,14 @@ static int ivtv_querycap(struct file *file, void *fh, struct v4l2_capability *vc
 
 static int ivtv_enumaudio(struct file *file, void *fh, struct v4l2_audio *vin)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         return ivtv_get_audio_input(itv, vin->index, vin);
 }
 
 static int ivtv_g_audio(struct file *file, void *fh, struct v4l2_audio *vin)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         vin->index = itv->audio_input;
         return ivtv_get_audio_input(itv, vin->index, vin);
@@ -779,7 +779,7 @@ static int ivtv_g_audio(struct file *file, void *fh, struct v4l2_audio *vin)
 
 static int ivtv_s_audio(struct file *file, void *fh, struct v4l2_audio *vout)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (vout->index >= itv->nof_audio_inputs)
                 return -EINVAL;
@@ -792,7 +792,7 @@ static int ivtv_s_audio(struct file *file, void *fh, struct v4l2_audio *vout)
 
 static int ivtv_enumaudout(struct file *file, void *fh, struct v4l2_audioout *vin)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         /* set it to defaults from our table */
         return ivtv_get_audio_output(itv, vin->index, vin);
@@ -800,7 +800,7 @@ static int ivtv_enumaudout(struct file *file, void *fh, struct v4l2_audioout *vi
 
 static int ivtv_g_audout(struct file *file, void *fh, struct v4l2_audioout *vin)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         vin->index = 0;
         return ivtv_get_audio_output(itv, vin->index, vin);
@@ -808,14 +808,14 @@ static int ivtv_g_audout(struct file *file, void *fh, struct v4l2_audioout *vin)
 
 static int ivtv_s_audout(struct file *file, void *fh, struct v4l2_audioout *vout)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         return ivtv_get_audio_output(itv, vout->index, vout);
 }
 
 static int ivtv_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         /* set it to defaults from our table */
         return ivtv_get_input(itv, vin->index, vin);
@@ -823,14 +823,14 @@ static int ivtv_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
 
 static int ivtv_enum_output(struct file *file, void *fh, struct v4l2_output *vout)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         return ivtv_get_output(itv, vout->index, vout);
 }
 
 static int ivtv_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct yuv_playback_info *yi = &itv->yuv_info;
         int streamtype;
@@ -867,7 +867,7 @@ static int ivtv_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropca
 
 static int ivtv_s_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct yuv_playback_info *yi = &itv->yuv_info;
         int streamtype;
@@ -893,7 +893,7 @@ static int ivtv_s_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 
 static int ivtv_g_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct yuv_playback_info *yi = &itv->yuv_info;
         int streamtype;
@@ -935,7 +935,7 @@ static int ivtv_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdes
 
 static int ivtv_enum_fmt_vid_out(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         static struct v4l2_fmtdesc formats[] = {
                 { 0, 0, 0,
@@ -963,7 +963,7 @@ static int ivtv_enum_fmt_vid_out(struct file *file, void *fh, struct v4l2_fmtdes
 
 static int ivtv_g_input(struct file *file, void *fh, unsigned int *i)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         *i = itv->active_input;
 
@@ -972,7 +972,7 @@ static int ivtv_g_input(struct file *file, void *fh, unsigned int *i)
 
 int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (inp < 0 || inp >= itv->nof_inputs)
                 return -EINVAL;
@@ -1006,7 +1006,7 @@ int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
 
 static int ivtv_g_output(struct file *file, void *fh, unsigned int *i)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
                 return -EINVAL;
@@ -1018,7 +1018,7 @@ static int ivtv_g_output(struct file *file, void *fh, unsigned int *i)
 
 static int ivtv_s_output(struct file *file, void *fh, unsigned int outp)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (outp >= itv->card->nof_outputs)
                 return -EINVAL;
@@ -1040,7 +1040,7 @@ static int ivtv_s_output(struct file *file, void *fh, unsigned int outp)
 
 static int ivtv_g_frequency(struct file *file, void *fh, struct v4l2_frequency *vf)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (vf->tuner != 0)
                 return -EINVAL;
@@ -1051,7 +1051,7 @@ static int ivtv_g_frequency(struct file *file, void *fh, struct v4l2_frequency *
 
 int ivtv_s_frequency(struct file *file, void *fh, struct v4l2_frequency *vf)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (vf->tuner != 0)
                 return -EINVAL;
@@ -1065,7 +1065,7 @@ int ivtv_s_frequency(struct file *file, void *fh, struct v4l2_frequency *vf)
 
 static int ivtv_g_std(struct file *file, void *fh, v4l2_std_id *std)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         *std = itv->std;
         return 0;
@@ -1074,7 +1074,7 @@ static int ivtv_g_std(struct file *file, void *fh, v4l2_std_id *std)
 int ivtv_s_std(struct file *file, void *fh, v4l2_std_id *std)
 {
         DEFINE_WAIT(wait);
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         struct yuv_playback_info *yi = &itv->yuv_info;
         int f;
 
@@ -1153,7 +1153,7 @@ int ivtv_s_std(struct file *file, void *fh, v4l2_std_id *std)
 
 static int ivtv_s_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
 
         if (vt->index != 0)
@@ -1166,7 +1166,7 @@ static int ivtv_s_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
 
 static int ivtv_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (vt->index != 0)
                 return -EINVAL;
@@ -1186,7 +1186,7 @@ static int ivtv_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
 
 static int ivtv_g_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_sliced_vbi_cap *cap)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         int set = itv->is_50hz ? V4L2_SLICED_VBI_625 : V4L2_SLICED_VBI_525;
         int f, l;
 
@@ -1216,7 +1216,7 @@ static int ivtv_g_sliced_vbi_cap(struct file *file, void *fh, struct v4l2_sliced
 
 static int ivtv_g_enc_index(struct file *file, void *fh, struct v4l2_enc_idx *idx)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         struct v4l2_enc_idx_entry *e = idx->entry;
         int entries;
         int i;
@@ -1239,7 +1239,7 @@ static int ivtv_g_enc_index(struct file *file, void *fh, struct v4l2_enc_idx *id
 
 static int ivtv_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder_cmd *enc)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
 
 
@@ -1291,7 +1291,7 @@ static int ivtv_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder_cmd
 
 static int ivtv_try_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder_cmd *enc)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         switch (enc->cmd) {
         case V4L2_ENC_CMD_START:
@@ -1321,7 +1321,7 @@ static int ivtv_try_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder
 
 static int ivtv_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         u32 data[CX2341X_MBOX_MAX_DATA];
         struct yuv_playback_info *yi = &itv->yuv_info;
 
@@ -1408,7 +1408,7 @@ static int ivtv_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
 
 static int ivtv_s_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
         struct yuv_playback_info *yi = &itv->yuv_info;
 
@@ -1428,7 +1428,7 @@ static int ivtv_s_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
 
 static int ivtv_overlay(struct file *file, void *fh, unsigned int on)
 {
-        struct ivtv_open_id *id = fh;
+        struct ivtv_open_id *id = fh2id(fh);
         struct ivtv *itv = id->itv;
 
         if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT_OVERLAY))
@@ -1453,7 +1453,7 @@ static int ivtv_subscribe_event(struct v4l2_fh *fh, struct v4l2_event_subscripti
 
 static int ivtv_log_status(struct file *file, void *fh)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
         u32 data[CX2341X_MBOX_MAX_DATA];
 
         int has_output = itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT;
@@ -1781,7 +1781,7 @@ static int ivtv_decoder_ioctls(struct file *filp, unsigned int cmd, void *arg)
 static long ivtv_default(struct file *file, void *fh, bool valid_prio,
                          int cmd, void *arg)
 {
-        struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
+        struct ivtv *itv = fh2id(fh)->itv;
 
         if (!valid_prio) {
                 switch (cmd) {