Hi,
On Mon, 2018-04-09 at 16:20 +0200, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>
> v4l2_ctrl uses mutexes, so we can't setup a ctrl_handler in
> interrupt context. Switch to a workqueue instead.
See one comment below.
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> ---
> drivers/media/platform/vim2m.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/vim2m.c
> b/drivers/media/platform/vim2m.c
> index ef970434af13..9b18b32c255d 100644
> --- a/drivers/media/platform/vim2m.c
> +++ b/drivers/media/platform/vim2m.c
> @@ -150,6 +150,7 @@ struct vim2m_dev {
> spinlock_t irqlock;
>
> struct timer_list timer;
> + struct work_struct work_run;
Wouldn't it make more sense to move this to vim2m_ctx instead (since
this is heavily m2m-specific)?
> struct v4l2_m2m_dev *m2m_dev;
> };
> @@ -392,9 +393,10 @@ static void device_run(void *priv)
> schedule_irq(dev, ctx->transtime);
> }
>
> -static void device_isr(struct timer_list *t)
> +static void device_work(struct work_struct *w)
> {
> - struct vim2m_dev *vim2m_dev = from_timer(vim2m_dev, t,
> timer);
> + struct vim2m_dev *vim2m_dev =
> + container_of(w, struct vim2m_dev, work_run);
> struct vim2m_ctx *curr_ctx;
> struct vb2_v4l2_buffer *src_vb, *dst_vb;
> unsigned long flags;
> @@ -426,6 +428,13 @@ static void device_isr(struct timer_list *t)
> }
> }
>
> +static void device_isr(struct timer_list *t)
> +{
> + struct vim2m_dev *vim2m_dev = from_timer(vim2m_dev, t,
> timer);
> +
> + schedule_work(&vim2m_dev->work_run);
> +}
> +
> /*
> * video ioctls
> */
> @@ -806,6 +815,7 @@ static void vim2m_stop_streaming(struct vb2_queue
> *q)
> struct vb2_v4l2_buffer *vbuf;
> unsigned long flags;
>
> + flush_scheduled_work();
> for (;;) {
> if (V4L2_TYPE_IS_OUTPUT(q->type))
> vbuf = v4l2_m2m_src_buf_remove(ctx-
> >fh.m2m_ctx);
> @@ -1011,6 +1021,7 @@ static int vim2m_probe(struct platform_device
> *pdev)
> vfd = &dev->vfd;
> vfd->lock = &dev->dev_mutex;
> vfd->v4l2_dev = &dev->v4l2_dev;
> + INIT_WORK(&dev->work_run, device_work);
>
> #ifdef CONFIG_MEDIA_CONTROLLER
> dev->mdev.dev = &pdev->dev;
--
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.comAttachment:
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