[PATCH] media: rkvdec: Fix .buf_prepare

[PATCH] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

---
@Hans: I haven't had anyone complain about the issue. The fix is needed for
the rkvdec vp9 work, so I think 5.14 is fine.

 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..ef2166043127 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer bytesused is written by driver for CAPTURE buffers.
+	 * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (!V4L2_TYPE_IS_OUTPUT(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 

base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1

[PATCH] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

---
@Hans: I haven't had anyone complain about the issue. The fix is needed for
the rkvdec vp9 work, so I think 5.14 is fine.

 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..ef2166043127 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer bytesused is written by driver for CAPTURE buffers.
+	 * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (!V4L2_TYPE_IS_OUTPUT(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 

base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1

_______________________________________________
devel mailing list
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http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

[PATCH] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

---
@Hans: I haven't had anyone complain about the issue. The fix is needed for
the rkvdec vp9 work, so I think 5.14 is fine.

 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..ef2166043127 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer bytesused is written by driver for CAPTURE buffers.
+	 * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (!V4L2_TYPE_IS_OUTPUT(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 

base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1


_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

Re: [PATCH] media: rkvdec: Fix .buf_prepare

[Ezequiel Garcia]

Hi Andrzej,

Thanks a lot for picking this up.

On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
> From: Ezequiel Garcia <ezequiel@collabora.com>
> 
> The driver should only set the payload on .buf_prepare if the
> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
> set by userspace then v4l2-core will set it to buffer length.
> 
> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> 
> ---
> @Hans: I haven't had anyone complain about the issue. The fix is needed for
> the rkvdec vp9 work, so I think 5.14 is fine.
> 
>  drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index d821661d30f3..ef2166043127 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>                 if (vb2_plane_size(vb, i) < sizeimage)
>                         return -EINVAL;
>         }
> -       vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
> +
> +       /*
> +        * Buffer bytesused is written by driver for CAPTURE buffers.
> +        * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
> +        * it to buffer length).
> +        */
> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type))

Please use V4L2_TYPE_IS_CAPTURE here.

Also, why is this change needed in rkvdec, but not in cedrus
or hantro?

Thanks!
Ezequiel

Re: [PATCH] media: rkvdec: Fix .buf_prepare

[Ezequiel Garcia]

Hi Andrzej,

Thanks a lot for picking this up.

On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
> From: Ezequiel Garcia <ezequiel@collabora.com>
> 
> The driver should only set the payload on .buf_prepare if the
> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
> set by userspace then v4l2-core will set it to buffer length.
> 
> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> 
> ---
> @Hans: I haven't had anyone complain about the issue. The fix is needed for
> the rkvdec vp9 work, so I think 5.14 is fine.
> 
>  drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index d821661d30f3..ef2166043127 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>                 if (vb2_plane_size(vb, i) < sizeimage)
>                         return -EINVAL;
>         }
> -       vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
> +
> +       /*
> +        * Buffer bytesused is written by driver for CAPTURE buffers.
> +        * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
> +        * it to buffer length).
> +        */
> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type))

Please use V4L2_TYPE_IS_CAPTURE here.

Also, why is this change needed in rkvdec, but not in cedrus
or hantro?

Thanks!
Ezequiel

_______________________________________________
devel mailing list
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http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Re: [PATCH] media: rkvdec: Fix .buf_prepare

[Ezequiel Garcia]

Hi Andrzej,

Thanks a lot for picking this up.

On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
> From: Ezequiel Garcia <ezequiel@collabora.com>
> 
> The driver should only set the payload on .buf_prepare if the
> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
> set by userspace then v4l2-core will set it to buffer length.
> 
> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> 
> ---
> @Hans: I haven't had anyone complain about the issue. The fix is needed for
> the rkvdec vp9 work, so I think 5.14 is fine.
> 
>  drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index d821661d30f3..ef2166043127 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>                 if (vb2_plane_size(vb, i) < sizeimage)
>                         return -EINVAL;
>         }
> -       vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
> +
> +       /*
> +        * Buffer bytesused is written by driver for CAPTURE buffers.
> +        * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
> +        * it to buffer length).
> +        */
> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type))

Please use V4L2_TYPE_IS_CAPTURE here.

Also, why is this change needed in rkvdec, but not in cedrus
or hantro?

Thanks!
Ezequiel


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Re: [PATCH] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

Hi Ezequiel,

W dniu 04.05.2021 o 13:56, Ezequiel Garcia pisze:
> Hi Andrzej,
> 
> Thanks a lot for picking this up.
> 
> On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
>> From: Ezequiel Garcia <ezequiel@collabora.com>
>>
>> The driver should only set the payload on .buf_prepare if the
>> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
>> set by userspace then v4l2-core will set it to buffer length.
>>
>> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
>> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
>> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
>> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
>>
>> ---
>> @Hans: I haven't had anyone complain about the issue. The fix is needed for
>> the rkvdec vp9 work, so I think 5.14 is fine.
>>
>>   drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>>   1 file changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
>> index d821661d30f3..ef2166043127 100644
>> --- a/drivers/staging/media/rkvdec/rkvdec.c
>> +++ b/drivers/staging/media/rkvdec/rkvdec.c
>> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>>                  if (vb2_plane_size(vb, i) < sizeimage)
>>                          return -EINVAL;
>>          }
>> -       vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
>> +
>> +       /*
>> +        * Buffer bytesused is written by driver for CAPTURE buffers.
>> +        * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
>> +        * it to buffer length).
>> +        */
>> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type))
> 
> Please use V4L2_TYPE_IS_CAPTURE here.
> 
> Also, why is this change needed in rkvdec, but not in cedrus
> or hantro?
> 

As a matter of fact I think it is needed in all three, because later on,
whenever a driver uses vb2_get_plane_payload(), without such a patch it
will get an invalid number and write that to a hardware register, causing
incorrect behavior.

I will respond with a v2 series.

Regards,

Andrzej

Re: [PATCH] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

Hi Ezequiel,

W dniu 04.05.2021 o 13:56, Ezequiel Garcia pisze:
> Hi Andrzej,
> 
> Thanks a lot for picking this up.
> 
> On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
>> From: Ezequiel Garcia <ezequiel@collabora.com>
>>
>> The driver should only set the payload on .buf_prepare if the
>> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
>> set by userspace then v4l2-core will set it to buffer length.
>>
>> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
>> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
>> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
>> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
>>
>> ---
>> @Hans: I haven't had anyone complain about the issue. The fix is needed for
>> the rkvdec vp9 work, so I think 5.14 is fine.
>>
>>   drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>>   1 file changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
>> index d821661d30f3..ef2166043127 100644
>> --- a/drivers/staging/media/rkvdec/rkvdec.c
>> +++ b/drivers/staging/media/rkvdec/rkvdec.c
>> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>>                  if (vb2_plane_size(vb, i) < sizeimage)
>>                          return -EINVAL;
>>          }
>> -       vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
>> +
>> +       /*
>> +        * Buffer bytesused is written by driver for CAPTURE buffers.
>> +        * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
>> +        * it to buffer length).
>> +        */
>> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type))
> 
> Please use V4L2_TYPE_IS_CAPTURE here.
> 
> Also, why is this change needed in rkvdec, but not in cedrus
> or hantro?
> 

As a matter of fact I think it is needed in all three, because later on,
whenever a driver uses vb2_get_plane_payload(), without such a patch it
will get an invalid number and write that to a hardware register, causing
incorrect behavior.

I will respond with a v2 series.

Regards,

Andrzej
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Re: [PATCH] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

Hi Ezequiel,

W dniu 04.05.2021 o 13:56, Ezequiel Garcia pisze:
> Hi Andrzej,
> 
> Thanks a lot for picking this up.
> 
> On Tue, 2021-05-04 at 13:37 +0200, Andrzej Pietrasiewicz wrote:
>> From: Ezequiel Garcia <ezequiel@collabora.com>
>>
>> The driver should only set the payload on .buf_prepare if the
>> buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
>> set by userspace then v4l2-core will set it to buffer length.
>>
>> Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
>> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
>> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
>> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
>>
>> ---
>> @Hans: I haven't had anyone complain about the issue. The fix is needed for
>> the rkvdec vp9 work, so I think 5.14 is fine.
>>
>>   drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
>>   1 file changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
>> index d821661d30f3..ef2166043127 100644
>> --- a/drivers/staging/media/rkvdec/rkvdec.c
>> +++ b/drivers/staging/media/rkvdec/rkvdec.c
>> @@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
>>                  if (vb2_plane_size(vb, i) < sizeimage)
>>                          return -EINVAL;
>>          }
>> -       vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
>> +
>> +       /*
>> +        * Buffer bytesused is written by driver for CAPTURE buffers.
>> +        * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
>> +        * it to buffer length).
>> +        */
>> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type))
> 
> Please use V4L2_TYPE_IS_CAPTURE here.
> 
> Also, why is this change needed in rkvdec, but not in cedrus
> or hantro?
> 

As a matter of fact I think it is needed in all three, because later on,
whenever a driver uses vb2_get_plane_payload(), without such a patch it
will get an invalid number and write that to a hardware register, causing
incorrect behavior.

I will respond with a v2 series.

Regards,

Andrzej

_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

[PATCHv2 0/3] Fix .buf_prepare

[Andrzej Pietrasiewicz]

Drivers should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver.

Andrzej Pietrasiewicz (2):
  media: hantro: Fix .buf_prepare
  media: cedrus: Fix .buf_prepare

Ezequiel Garcia (1):
  media: rkvdec: Fix .buf_prepare

 drivers/staging/media/hantro/hantro_v4l2.c        |  9 ++++++++-
 drivers/staging/media/rkvdec/rkvdec.c             | 10 +++++++++-
 drivers/staging/media/sunxi/cedrus/cedrus_video.c |  8 +++++++-
 3 files changed, 24 insertions(+), 3 deletions(-)


base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1

[PATCHv2 0/3] Fix .buf_prepare

[Andrzej Pietrasiewicz]

Drivers should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver.

Andrzej Pietrasiewicz (2):
  media: hantro: Fix .buf_prepare
  media: cedrus: Fix .buf_prepare

Ezequiel Garcia (1):
  media: rkvdec: Fix .buf_prepare

 drivers/staging/media/hantro/hantro_v4l2.c        |  9 ++++++++-
 drivers/staging/media/rkvdec/rkvdec.c             | 10 +++++++++-
 drivers/staging/media/sunxi/cedrus/cedrus_video.c |  8 +++++++-
 3 files changed, 24 insertions(+), 3 deletions(-)


base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

[PATCHv2 0/3] Fix .buf_prepare

[Andrzej Pietrasiewicz]

Drivers should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver.

Andrzej Pietrasiewicz (2):
  media: hantro: Fix .buf_prepare
  media: cedrus: Fix .buf_prepare

Ezequiel Garcia (1):
  media: rkvdec: Fix .buf_prepare

 drivers/staging/media/hantro/hantro_v4l2.c        |  9 ++++++++-
 drivers/staging/media/rkvdec/rkvdec.c             | 10 +++++++++-
 drivers/staging/media/sunxi/cedrus/cedrus_video.c |  8 +++++++-
 3 files changed, 24 insertions(+), 3 deletions(-)


base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1


_______________________________________________
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Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

[PATCHv2 0/3] Fix .buf_prepare

[Andrzej Pietrasiewicz]

Drivers should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver.

Andrzej Pietrasiewicz (2):
  media: hantro: Fix .buf_prepare
  media: cedrus: Fix .buf_prepare

Ezequiel Garcia (1):
  media: rkvdec: Fix .buf_prepare

 drivers/staging/media/hantro/hantro_v4l2.c        |  9 ++++++++-
 drivers/staging/media/rkvdec/rkvdec.c             | 10 +++++++++-
 drivers/staging/media/sunxi/cedrus/cedrus_video.c |  8 +++++++-
 3 files changed, 24 insertions(+), 3 deletions(-)


base-commit: 0b276e470a4d43e1365d3eb53c608a3d208cabd4
-- 
2.17.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCHv2 1/3] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in rkvdec-h264.c.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
[Changed the comment and used V4L2_TYPE_IS_CAPTURE macro]
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..cd65ad2af8d4 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1

[PATCHv2 1/3] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in rkvdec-h264.c.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
[Changed the comment and used V4L2_TYPE_IS_CAPTURE macro]
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..cd65ad2af8d4 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1

_______________________________________________
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http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

[PATCHv2 1/3] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in rkvdec-h264.c.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
[Changed the comment and used V4L2_TYPE_IS_CAPTURE macro]
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..cd65ad2af8d4 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1


_______________________________________________
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Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

[PATCHv2 1/3] media: rkvdec: Fix .buf_prepare

[Andrzej Pietrasiewicz]

From: Ezequiel Garcia <ezequiel@collabora.com>

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in rkvdec-h264.c.

Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
[Changed the comment and used V4L2_TYPE_IS_CAPTURE macro]
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..cd65ad2af8d4 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
 		if (vb2_plane_size(vb, i) < sizeimage)
 			return -EINVAL;
 	}
-	vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCHv2 2/3] media: hantro: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in hantro_g1_h264_dec.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/hantro/hantro_v4l2.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
index 1bc118e375a1..7ccc6405036a 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -639,7 +639,14 @@ static int hantro_buf_prepare(struct vb2_buffer *vb)
 	ret = hantro_buf_plane_check(vb, pix_fmt);
 	if (ret)
 		return ret;
-	vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1

[PATCHv2 2/3] media: hantro: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in hantro_g1_h264_dec.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/hantro/hantro_v4l2.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
index 1bc118e375a1..7ccc6405036a 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -639,7 +639,14 @@ static int hantro_buf_prepare(struct vb2_buffer *vb)
 	ret = hantro_buf_plane_check(vb, pix_fmt);
 	if (ret)
 		return ret;
-	vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

[PATCHv2 2/3] media: hantro: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in hantro_g1_h264_dec.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/hantro/hantro_v4l2.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
index 1bc118e375a1..7ccc6405036a 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -639,7 +639,14 @@ static int hantro_buf_prepare(struct vb2_buffer *vb)
 	ret = hantro_buf_plane_check(vb, pix_fmt);
 	if (ret)
 		return ret;
-	vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-rockchip

[PATCHv2 2/3] media: hantro: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in hantro_g1_h264_dec.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/hantro/hantro_v4l2.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
index 1bc118e375a1..7ccc6405036a 100644
--- a/drivers/staging/media/hantro/hantro_v4l2.c
+++ b/drivers/staging/media/hantro/hantro_v4l2.c
@@ -639,7 +639,14 @@ static int hantro_buf_prepare(struct vb2_buffer *vb)
 	ret = hantro_buf_plane_check(vb, pix_fmt);
 	if (ret)
 		return ret;
-	vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
+
 	return 0;
 }
 
-- 
2.17.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCHv2 3/3] media: cedrus: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in cedrus_h264.c or cedrus_vp8.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus_video.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index b62eb8e84057..bf731caf2ed5 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -457,7 +457,13 @@ static int cedrus_buf_prepare(struct vb2_buffer *vb)
 	if (vb2_plane_size(vb, 0) < pix_fmt->sizeimage)
 		return -EINVAL;
 
-	vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
 
 	return 0;
 }
-- 
2.17.1

[PATCHv2 3/3] media: cedrus: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in cedrus_h264.c or cedrus_vp8.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus_video.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index b62eb8e84057..bf731caf2ed5 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -457,7 +457,13 @@ static int cedrus_buf_prepare(struct vb2_buffer *vb)
 	if (vb2_plane_size(vb, 0) < pix_fmt->sizeimage)
 		return -EINVAL;
 
-	vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
 
 	return 0;
 }
-- 
2.17.1

_______________________________________________
devel mailing list
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http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

[PATCHv2 3/3] media: cedrus: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in cedrus_h264.c or cedrus_vp8.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus_video.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index b62eb8e84057..bf731caf2ed5 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -457,7 +457,13 @@ static int cedrus_buf_prepare(struct vb2_buffer *vb)
 	if (vb2_plane_size(vb, 0) < pix_fmt->sizeimage)
 		return -EINVAL;
 
-	vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
 
 	return 0;
 }
-- 
2.17.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-rockchip

[PATCHv2 3/3] media: cedrus: Fix .buf_prepare

[Andrzej Pietrasiewicz]

The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.

If we overwrite bytesused for OUTPUT buffers, too, then
vb2_get_plane_payload() will return incorrect value which might be then
written to hw registers by the driver in cedrus_h264.c or cedrus_vp8.c.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus_video.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index b62eb8e84057..bf731caf2ed5 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -457,7 +457,13 @@ static int cedrus_buf_prepare(struct vb2_buffer *vb)
 	if (vb2_plane_size(vb, 0) < pix_fmt->sizeimage)
 		return -EINVAL;
 
-	vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
+	/*
+	 * Buffer's bytesused must be written by driver for CAPTURE buffers.
+	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
+	 * it to buffer length).
+	 */
+	if (V4L2_TYPE_IS_CAPTURE(vq->type))
+		vb2_set_plane_payload(vb, 0, pix_fmt->sizeimage);
 
 	return 0;
 }
-- 
2.17.1


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