linux-kernel - Re: [PATCH v2] media: mali-c55: Fix NULL dev stream alert for tpg/rsz/isp sub-device

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Message-ID: <aWj2WJJQbZDaarKc@zed>
Date: Thu, 15 Jan 2026 15:15:47 +0100
From: Jacopo Mondi <jacopo.mondi@...asonboard.com>
To: Dan Scally <dan.scally@...asonboard.com>
Cc: "jempty.liang" <imntjempty@....com>, jacopo.mondi@...asonboard.com, 
	mchehab@...nel.org, linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: mali-c55: Fix NULL dev stream alert for
 tpg/rsz/isp sub-device

Hi Dan, Jempty

On Thu, Jan 15, 2026 at 02:09:48PM +0000, Dan Scally wrote:
> Hi Jempty, thanks for the patch
>
> On 14/01/2026 01:50, jempty.liang wrote:
> > The subdevices registered by the Mali-C55 driver do not have their
> > 'struct device *dev' member initialized. This is visibile when looking
>
> s/visibile/visible
>
> The commit header also needs correcting really, as it still suggests that
> fixing the printout is the goal. Perhaps something like "media: mali-c55:
> Initialise dev member for struct v4l2_subdev"?

Right, sorry, I missed the commit message during review

>
> With that:
>
> Reviewed-by: Daniel Scally <dan.scally@...asonboard.com>
>
> > at debug message, as in example:
> >
> > "(NULL device *): collect_streams: sub-device 'mali-c55 tpg' does not
> >   support streams"
> >
> > Fix this by initializing the *dev field for each subdevice registered
> > by the Mali-C55 driver.
> >
> > Suggested-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>

Oh, no need to, I simply reviewed the patch :)

> > Signed-off-by: jempty.liang <imntjempty@....com>

With Dan's suggestion:
Reviewed-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>

Thanks
  j

> > ---
> >   drivers/media/platform/arm/mali-c55/mali-c55-isp.c     | 1 +
> >   drivers/media/platform/arm/mali-c55/mali-c55-resizer.c | 1 +
> >   drivers/media/platform/arm/mali-c55/mali-c55-tpg.c     | 1 +
> >   3 files changed, 3 insertions(+)
> >
> > diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-isp.c b/drivers/media/platform/arm/mali-c55/mali-c55-isp.c
> > index 497f25fbdd13..ce84aad9f1d5 100644
> > --- a/drivers/media/platform/arm/mali-c55/mali-c55-isp.c
> > +++ b/drivers/media/platform/arm/mali-c55/mali-c55-isp.c
> > @@ -610,6 +610,7 @@ int mali_c55_register_isp(struct mali_c55 *mali_c55)
> >   	sd->entity.ops = &mali_c55_isp_media_ops;
> >   	sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_ISP;
> >   	sd->internal_ops = &mali_c55_isp_internal_ops;
> > +	sd->dev = mali_c55->dev;
> >   	strscpy(sd->name, MALI_C55_DRIVER_NAME " isp", sizeof(sd->name));
> >   	isp->pads[MALI_C55_ISP_PAD_SINK_VIDEO].flags = MEDIA_PAD_FL_SINK |
> > diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-resizer.c b/drivers/media/platform/arm/mali-c55/mali-c55-resizer.c
> > index a8d739af74b6..c4f46651dcee 100644
> > --- a/drivers/media/platform/arm/mali-c55/mali-c55-resizer.c
> > +++ b/drivers/media/platform/arm/mali-c55/mali-c55-resizer.c
> > @@ -1070,6 +1070,7 @@ static int mali_c55_register_resizer(struct mali_c55 *mali_c55,
> >   	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
> >   	sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;
> >   	sd->internal_ops = &mali_c55_resizer_internal_ops;
> > +	sd->dev = mali_c55->dev;
> >   	rsz->pads[MALI_C55_RSZ_SINK_PAD].flags = MEDIA_PAD_FL_SINK;
> >   	rsz->pads[MALI_C55_RSZ_SOURCE_PAD].flags = MEDIA_PAD_FL_SOURCE;
> > diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-tpg.c b/drivers/media/platform/arm/mali-c55/mali-c55-tpg.c
> > index 1af5d2759a83..894f4cf377af 100644
> > --- a/drivers/media/platform/arm/mali-c55/mali-c55-tpg.c
> > +++ b/drivers/media/platform/arm/mali-c55/mali-c55-tpg.c
> > @@ -370,6 +370,7 @@ int mali_c55_register_tpg(struct mali_c55 *mali_c55)
> >   	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
> >   	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
> >   	sd->internal_ops = &mali_c55_tpg_internal_ops;
> > +	sd->dev = mali_c55->dev;
> >   	strscpy(sd->name, MALI_C55_DRIVER_NAME " tpg", sizeof(sd->name));
> >   	pad->flags = MEDIA_PAD_FL_SOURCE;
>