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[PATCH v3 2/2] media: ivtv: Fix invalid access to file *

Jacopo Mondi posted 2 patches 1 month, 2 weeks ago
There is a newer version of this series
[PATCH v3 2/2] media: ivtv: Fix invalid access to file *
Posted by Jacopo Mondi 1 month, 2 weeks ago 
Since commit 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
all ioctl handlers have been ported to operate on the file * first
function argument.

The ivtv DVB layer calls ivtv_init_on_first_open() when the driver
needs to start streaming. This function calls the s_input() and
s_frequency() ioctl handlers directly, but being called from the driver
context, it doesn't have a valid file * to pass them. This causes the
ioctl handlers to deference an invalid pointer.

Fix this by wrapping the ioctl handlers implementation in helper
functions.

The ivtv_do_s_input() helper accepts a struct ivtv * as first argument,
which is easily accessible from the DVB layer as well as from the file *
argument of the ioctl handler.

The ivtv_s_frequency() takes an ivtv_stream * instead. The stream * can
safely be accessed from the DVB layer which hard-codes it to the
IVTV_ENC_STREAM_TYPE_MPG stream type, as well as from the ioctl handler
a valid stream type is associated to each open file handle depending on
which video device node has been opened in the ivtv_open() file
operation.

The bug has been reported by Smatch.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/aKL4OMWsESUdX8KQ@stanley.mountain/
Fixes: 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
Cc: stable@vger.kernel.org
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 drivers/media/pci/ivtv/ivtv-driver.c | 11 ++++-------
 drivers/media/pci/ivtv/ivtv-ioctl.c  | 22 +++++++++++++++++-----
 drivers/media/pci/ivtv/ivtv-ioctl.h  |  6 ++++--
 3 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/drivers/media/pci/ivtv/ivtv-driver.c b/drivers/media/pci/ivtv/ivtv-driver.c
index ecc20cd89926fe2ce4e472526a6b5fc0857615dd..7e2fb98cfccf02f701ceb4484dd1d330dd1dc867 100644
--- a/drivers/media/pci/ivtv/ivtv-driver.c
+++ b/drivers/media/pci/ivtv/ivtv-driver.c
@@ -1260,15 +1260,12 @@ static int ivtv_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
 
 int ivtv_init_on_first_open(struct ivtv *itv)
 {
-	struct v4l2_frequency vf;
 	/* Needed to call ioctls later */
-	struct ivtv_open_id fh;
+	struct ivtv_stream *s = &itv->streams[IVTV_ENC_STREAM_TYPE_MPG];
+	struct v4l2_frequency vf;
 	int fw_retry_count = 3;
 	int video_input;
 
-	fh.itv = itv;
-	fh.type = IVTV_ENC_STREAM_TYPE_MPG;
-
 	if (test_bit(IVTV_F_I_FAILED, &itv->i_flags))
 		return -ENXIO;
 
@@ -1310,13 +1307,13 @@ int ivtv_init_on_first_open(struct ivtv *itv)
 
 	video_input = itv->active_input;
 	itv->active_input++;	/* Force update of input */
-	ivtv_s_input(NULL, &fh, video_input);
+	ivtv_do_s_input(itv, video_input);
 
 	/* Let the VIDIOC_S_STD ioctl do all the work, keeps the code
 	   in one place. */
 	itv->std++;		/* Force full standard initialization */
 	itv->std_out = itv->std;
-	ivtv_s_frequency(NULL, &fh, &vf);
+	ivtv_do_s_frequency(s, &vf);
 
 	if (itv->card->v4l2_capabilities & V4L2_CAP_VIDEO_OUTPUT) {
 		/* Turn on the TV-out: ivtv_init_mpeg_decoder() initializes
diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.c b/drivers/media/pci/ivtv/ivtv-ioctl.c
index 8077a71d4850ec773caa20c3fca08f92f3117d69..dfbc842b22453868a2075935a81db7ae313ee46c 100644
--- a/drivers/media/pci/ivtv/ivtv-ioctl.c
+++ b/drivers/media/pci/ivtv/ivtv-ioctl.c
@@ -974,9 +974,8 @@ static int ivtv_g_input(struct file *file, void *fh, unsigned int *i)
 	return 0;
 }
 
-int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
+int ivtv_do_s_input(struct ivtv *itv, unsigned int inp)
 {
-	struct ivtv *itv = file2id(file)->itv;
 	v4l2_std_id std;
 	int i;
 
@@ -1017,6 +1016,11 @@ int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
 	return 0;
 }
 
+static int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
+{
+	return ivtv_do_s_input(file2id(file)->itv, inp);
+}
+
 static int ivtv_g_output(struct file *file, void *fh, unsigned int *i)
 {
 	struct ivtv *itv = file2id(file)->itv;
@@ -1065,10 +1069,9 @@ static int ivtv_g_frequency(struct file *file, void *fh, struct v4l2_frequency *
 	return 0;
 }
 
-int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *vf)
+int ivtv_do_s_frequency(struct ivtv_stream *s, const struct v4l2_frequency *vf)
 {
-	struct ivtv *itv = file2id(file)->itv;
-	struct ivtv_stream *s = &itv->streams[file2id(file)->type];
+	struct ivtv *itv = s->itv;
 
 	if (s->vdev.vfl_dir)
 		return -ENOTTY;
@@ -1082,6 +1085,15 @@ int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *v
 	return 0;
 }
 
+static int ivtv_s_frequency(struct file *file, void *fh,
+			    const struct v4l2_frequency *vf)
+{
+	struct ivtv_open_id *id = file2id(file);
+	struct ivtv *itv = id->itv;
+
+	return ivtv_do_s_frequency(&itv->streams[id->type], vf);
+}
+
 static int ivtv_g_std(struct file *file, void *fh, v4l2_std_id *std)
 {
 	struct ivtv *itv = file2id(file)->itv;
diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.h b/drivers/media/pci/ivtv/ivtv-ioctl.h
index 42c2516379fcbbd0640820ab0e3abe9bf00b57ea..dd713a6b095e5ebca45a234dd6c9a90df0928596 100644
--- a/drivers/media/pci/ivtv/ivtv-ioctl.h
+++ b/drivers/media/pci/ivtv/ivtv-ioctl.h
@@ -17,7 +17,9 @@ int ivtv_set_speed(struct ivtv *itv, int speed);
 void ivtv_set_funcs(struct video_device *vdev);
 void ivtv_s_std_enc(struct ivtv *itv, v4l2_std_id std);
 void ivtv_s_std_dec(struct ivtv *itv, v4l2_std_id std);
-int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *vf);
-int ivtv_s_input(struct file *file, void *fh, unsigned int inp);
+
+struct ivtv;
+int ivtv_do_s_frequency(struct ivtv_stream *s, const struct v4l2_frequency *vf);
+int ivtv_do_s_input(struct ivtv *itv, unsigned int inp);
 
 #endif

-- 
2.50.1
Re: [PATCH v3 2/2] media: ivtv: Fix invalid access to file *
Posted by Laurent Pinchart 1 month, 2 weeks ago 
Hi Jacopo,

Thank you for the patch.

On Mon, Aug 18, 2025 at 10:39:37PM +0200, Jacopo Mondi wrote:
> Since commit 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
> all ioctl handlers have been ported to operate on the file * first
> function argument.
> 
> The ivtv DVB layer calls ivtv_init_on_first_open() when the driver
> needs to start streaming. This function calls the s_input() and
> s_frequency() ioctl handlers directly, but being called from the driver
> context, it doesn't have a valid file * to pass them. This causes the
> ioctl handlers to deference an invalid pointer.
> 
> Fix this by wrapping the ioctl handlers implementation in helper
> functions.

You may want to reword this in a similar way as proposed in 1/2.

> 
> The ivtv_do_s_input() helper accepts a struct ivtv * as first argument,
> which is easily accessible from the DVB layer as well as from the file *
> argument of the ioctl handler.
> 
> The ivtv_s_frequency() takes an ivtv_stream * instead. The stream * can
> safely be accessed from the DVB layer which hard-codes it to the
> IVTV_ENC_STREAM_TYPE_MPG stream type, as well as from the ioctl handler
> a valid stream type is associated to each open file handle depending on
> which video device node has been opened in the ivtv_open() file
> operation.
> 
> The bug has been reported by Smatch.
> 
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/all/aKL4OMWsESUdX8KQ@stanley.mountain/
> Fixes: 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
> Cc: stable@vger.kernel.org
> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---
>  drivers/media/pci/ivtv/ivtv-driver.c | 11 ++++-------
>  drivers/media/pci/ivtv/ivtv-ioctl.c  | 22 +++++++++++++++++-----
>  drivers/media/pci/ivtv/ivtv-ioctl.h  |  6 ++++--
>  3 files changed, 25 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/media/pci/ivtv/ivtv-driver.c b/drivers/media/pci/ivtv/ivtv-driver.c
> index ecc20cd89926fe2ce4e472526a6b5fc0857615dd..7e2fb98cfccf02f701ceb4484dd1d330dd1dc867 100644
> --- a/drivers/media/pci/ivtv/ivtv-driver.c
> +++ b/drivers/media/pci/ivtv/ivtv-driver.c
> @@ -1260,15 +1260,12 @@ static int ivtv_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
>  
>  int ivtv_init_on_first_open(struct ivtv *itv)
>  {
> -	struct v4l2_frequency vf;
>  	/* Needed to call ioctls later */

I'd drop the comment.

> -	struct ivtv_open_id fh;
> +	struct ivtv_stream *s = &itv->streams[IVTV_ENC_STREAM_TYPE_MPG];
> +	struct v4l2_frequency vf;
>  	int fw_retry_count = 3;
>  	int video_input;
>  
> -	fh.itv = itv;
> -	fh.type = IVTV_ENC_STREAM_TYPE_MPG;
> -
>  	if (test_bit(IVTV_F_I_FAILED, &itv->i_flags))
>  		return -ENXIO;
>  
> @@ -1310,13 +1307,13 @@ int ivtv_init_on_first_open(struct ivtv *itv)
>  
>  	video_input = itv->active_input;
>  	itv->active_input++;	/* Force update of input */
> -	ivtv_s_input(NULL, &fh, video_input);
> +	ivtv_do_s_input(itv, video_input);
>  
>  	/* Let the VIDIOC_S_STD ioctl do all the work, keeps the code
>  	   in one place. */
>  	itv->std++;		/* Force full standard initialization */
>  	itv->std_out = itv->std;
> -	ivtv_s_frequency(NULL, &fh, &vf);
> +	ivtv_do_s_frequency(s, &vf);

	ivtv_do_s_frequency(&itv->streams[IVTV_ENC_STREAM_TYPE_MPG], &vf);

would work too. Up to you.

>  
>  	if (itv->card->v4l2_capabilities & V4L2_CAP_VIDEO_OUTPUT) {
>  		/* Turn on the TV-out: ivtv_init_mpeg_decoder() initializes
> diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.c b/drivers/media/pci/ivtv/ivtv-ioctl.c
> index 8077a71d4850ec773caa20c3fca08f92f3117d69..dfbc842b22453868a2075935a81db7ae313ee46c 100644
> --- a/drivers/media/pci/ivtv/ivtv-ioctl.c
> +++ b/drivers/media/pci/ivtv/ivtv-ioctl.c
> @@ -974,9 +974,8 @@ static int ivtv_g_input(struct file *file, void *fh, unsigned int *i)
>  	return 0;
>  }
>  
> -int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
> +int ivtv_do_s_input(struct ivtv *itv, unsigned int inp)
>  {
> -	struct ivtv *itv = file2id(file)->itv;
>  	v4l2_std_id std;
>  	int i;
>  
> @@ -1017,6 +1016,11 @@ int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
>  	return 0;
>  }
>  
> +static int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
> +{
> +	return ivtv_do_s_input(file2id(file)->itv, inp);
> +}
> +
>  static int ivtv_g_output(struct file *file, void *fh, unsigned int *i)
>  {
>  	struct ivtv *itv = file2id(file)->itv;
> @@ -1065,10 +1069,9 @@ static int ivtv_g_frequency(struct file *file, void *fh, struct v4l2_frequency *
>  	return 0;
>  }
>  
> -int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *vf)
> +int ivtv_do_s_frequency(struct ivtv_stream *s, const struct v4l2_frequency *vf)
>  {
> -	struct ivtv *itv = file2id(file)->itv;
> -	struct ivtv_stream *s = &itv->streams[file2id(file)->type];
> +	struct ivtv *itv = s->itv;
>  
>  	if (s->vdev.vfl_dir)
>  		return -ENOTTY;
> @@ -1082,6 +1085,15 @@ int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *v
>  	return 0;
>  }
>  
> +static int ivtv_s_frequency(struct file *file, void *fh,
> +			    const struct v4l2_frequency *vf)
> +{
> +	struct ivtv_open_id *id = file2id(file);
> +	struct ivtv *itv = id->itv;
> +
> +	return ivtv_do_s_frequency(&itv->streams[id->type], vf);
> +}
> +
>  static int ivtv_g_std(struct file *file, void *fh, v4l2_std_id *std)
>  {
>  	struct ivtv *itv = file2id(file)->itv;
> diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.h b/drivers/media/pci/ivtv/ivtv-ioctl.h
> index 42c2516379fcbbd0640820ab0e3abe9bf00b57ea..dd713a6b095e5ebca45a234dd6c9a90df0928596 100644
> --- a/drivers/media/pci/ivtv/ivtv-ioctl.h
> +++ b/drivers/media/pci/ivtv/ivtv-ioctl.h
> @@ -17,7 +17,9 @@ int ivtv_set_speed(struct ivtv *itv, int speed);
>  void ivtv_set_funcs(struct video_device *vdev);
>  void ivtv_s_std_enc(struct ivtv *itv, v4l2_std_id std);
>  void ivtv_s_std_dec(struct ivtv *itv, v4l2_std_id std);
> -int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *vf);
> -int ivtv_s_input(struct file *file, void *fh, unsigned int inp);
> +
> +struct ivtv;

I'd drop this, as the structure is already used above.

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

> +int ivtv_do_s_frequency(struct ivtv_stream *s, const struct v4l2_frequency *vf);
> +int ivtv_do_s_input(struct ivtv *itv, unsigned int inp);
>  
>  #endif
> 

-- 
Regards,

Laurent Pinchart
Re: [PATCH v3 2/2] media: ivtv: Fix invalid access to file *
Posted by Jacopo Mondi 1 month, 2 weeks ago 
On Tue, Aug 19, 2025 at 02:59:06AM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Mon, Aug 18, 2025 at 10:39:37PM +0200, Jacopo Mondi wrote:
> > Since commit 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
> > all ioctl handlers have been ported to operate on the file * first
> > function argument.
> >
> > The ivtv DVB layer calls ivtv_init_on_first_open() when the driver
> > needs to start streaming. This function calls the s_input() and
> > s_frequency() ioctl handlers directly, but being called from the driver
> > context, it doesn't have a valid file * to pass them. This causes the
> > ioctl handlers to deference an invalid pointer.
> >
> > Fix this by wrapping the ioctl handlers implementation in helper
> > functions.
>
> You may want to reword this in a similar way as proposed in 1/2.
>
> >
> > The ivtv_do_s_input() helper accepts a struct ivtv * as first argument,
> > which is easily accessible from the DVB layer as well as from the file *
> > argument of the ioctl handler.
> >
> > The ivtv_s_frequency() takes an ivtv_stream * instead. The stream * can
> > safely be accessed from the DVB layer which hard-codes it to the
> > IVTV_ENC_STREAM_TYPE_MPG stream type, as well as from the ioctl handler
> > a valid stream type is associated to each open file handle depending on
> > which video device node has been opened in the ivtv_open() file
> > operation.
> >
> > The bug has been reported by Smatch.
> >
> > Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> > Closes: https://lore.kernel.org/all/aKL4OMWsESUdX8KQ@stanley.mountain/
> > Fixes: 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > ---
> >  drivers/media/pci/ivtv/ivtv-driver.c | 11 ++++-------
> >  drivers/media/pci/ivtv/ivtv-ioctl.c  | 22 +++++++++++++++++-----
> >  drivers/media/pci/ivtv/ivtv-ioctl.h  |  6 ++++--
> >  3 files changed, 25 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/media/pci/ivtv/ivtv-driver.c b/drivers/media/pci/ivtv/ivtv-driver.c
> > index ecc20cd89926fe2ce4e472526a6b5fc0857615dd..7e2fb98cfccf02f701ceb4484dd1d330dd1dc867 100644
> > --- a/drivers/media/pci/ivtv/ivtv-driver.c
> > +++ b/drivers/media/pci/ivtv/ivtv-driver.c
> > @@ -1260,15 +1260,12 @@ static int ivtv_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
> >
> >  int ivtv_init_on_first_open(struct ivtv *itv)
> >  {
> > -	struct v4l2_frequency vf;
> >  	/* Needed to call ioctls later */
>
> I'd drop the comment.

it was there already and it's not misleading

>
> > -	struct ivtv_open_id fh;
> > +	struct ivtv_stream *s = &itv->streams[IVTV_ENC_STREAM_TYPE_MPG];
> > +	struct v4l2_frequency vf;
> >  	int fw_retry_count = 3;
> >  	int video_input;
> >
> > -	fh.itv = itv;
> > -	fh.type = IVTV_ENC_STREAM_TYPE_MPG;
> > -
> >  	if (test_bit(IVTV_F_I_FAILED, &itv->i_flags))
> >  		return -ENXIO;
> >
> > @@ -1310,13 +1307,13 @@ int ivtv_init_on_first_open(struct ivtv *itv)
> >
> >  	video_input = itv->active_input;
> >  	itv->active_input++;	/* Force update of input */
> > -	ivtv_s_input(NULL, &fh, video_input);
> > +	ivtv_do_s_input(itv, video_input);
> >
> >  	/* Let the VIDIOC_S_STD ioctl do all the work, keeps the code
> >  	   in one place. */
> >  	itv->std++;		/* Force full standard initialization */
> >  	itv->std_out = itv->std;
> > -	ivtv_s_frequency(NULL, &fh, &vf);
> > +	ivtv_do_s_frequency(s, &vf);
>
> 	ivtv_do_s_frequency(&itv->streams[IVTV_ENC_STREAM_TYPE_MPG], &vf);
>
> would work too. Up to you.
>

I know, but I prefer the way I have here

> >
> >  	if (itv->card->v4l2_capabilities & V4L2_CAP_VIDEO_OUTPUT) {
> >  		/* Turn on the TV-out: ivtv_init_mpeg_decoder() initializes
> > diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.c b/drivers/media/pci/ivtv/ivtv-ioctl.c
> > index 8077a71d4850ec773caa20c3fca08f92f3117d69..dfbc842b22453868a2075935a81db7ae313ee46c 100644
> > --- a/drivers/media/pci/ivtv/ivtv-ioctl.c
> > +++ b/drivers/media/pci/ivtv/ivtv-ioctl.c
> > @@ -974,9 +974,8 @@ static int ivtv_g_input(struct file *file, void *fh, unsigned int *i)
> >  	return 0;
> >  }
> >
> > -int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
> > +int ivtv_do_s_input(struct ivtv *itv, unsigned int inp)
> >  {
> > -	struct ivtv *itv = file2id(file)->itv;
> >  	v4l2_std_id std;
> >  	int i;
> >
> > @@ -1017,6 +1016,11 @@ int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
> >  	return 0;
> >  }
> >
> > +static int ivtv_s_input(struct file *file, void *fh, unsigned int inp)
> > +{
> > +	return ivtv_do_s_input(file2id(file)->itv, inp);
> > +}
> > +
> >  static int ivtv_g_output(struct file *file, void *fh, unsigned int *i)
> >  {
> >  	struct ivtv *itv = file2id(file)->itv;
> > @@ -1065,10 +1069,9 @@ static int ivtv_g_frequency(struct file *file, void *fh, struct v4l2_frequency *
> >  	return 0;
> >  }
> >
> > -int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *vf)
> > +int ivtv_do_s_frequency(struct ivtv_stream *s, const struct v4l2_frequency *vf)
> >  {
> > -	struct ivtv *itv = file2id(file)->itv;
> > -	struct ivtv_stream *s = &itv->streams[file2id(file)->type];
> > +	struct ivtv *itv = s->itv;
> >
> >  	if (s->vdev.vfl_dir)
> >  		return -ENOTTY;
> > @@ -1082,6 +1085,15 @@ int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *v
> >  	return 0;
> >  }
> >
> > +static int ivtv_s_frequency(struct file *file, void *fh,
> > +			    const struct v4l2_frequency *vf)
> > +{
> > +	struct ivtv_open_id *id = file2id(file);
> > +	struct ivtv *itv = id->itv;
> > +
> > +	return ivtv_do_s_frequency(&itv->streams[id->type], vf);
> > +}
> > +
> >  static int ivtv_g_std(struct file *file, void *fh, v4l2_std_id *std)
> >  {
> >  	struct ivtv *itv = file2id(file)->itv;
> > diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.h b/drivers/media/pci/ivtv/ivtv-ioctl.h
> > index 42c2516379fcbbd0640820ab0e3abe9bf00b57ea..dd713a6b095e5ebca45a234dd6c9a90df0928596 100644
> > --- a/drivers/media/pci/ivtv/ivtv-ioctl.h
> > +++ b/drivers/media/pci/ivtv/ivtv-ioctl.h
> > @@ -17,7 +17,9 @@ int ivtv_set_speed(struct ivtv *itv, int speed);
> >  void ivtv_set_funcs(struct video_device *vdev);
> >  void ivtv_s_std_enc(struct ivtv *itv, v4l2_std_id std);
> >  void ivtv_s_std_dec(struct ivtv *itv, v4l2_std_id std);
> > -int ivtv_s_frequency(struct file *file, void *fh, const struct v4l2_frequency *vf);
> > -int ivtv_s_input(struct file *file, void *fh, unsigned int inp);
> > +
> > +struct ivtv;
>
> I'd drop this, as the structure is already used above.

So it works by chance. I'll move the forward declaration up.

>
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>
> > +int ivtv_do_s_frequency(struct ivtv_stream *s, const struct v4l2_frequency *vf);
> > +int ivtv_do_s_input(struct ivtv *itv, unsigned int inp);
> >
> >  #endif
> >
>
> --
> Regards,
>
> Laurent Pinchart

Patchew 2.1-devel-b67e4c2

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