linux-kernel - Re: [Patch 05/13] media: am437x-vpfe: Streamlined vb2 buffer cleanup

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Date:   Mon, 16 Sep 2019 09:00:03 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Benoit Parrot <bparrot@...com>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        linux-media <linux-media@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Patch 05/13] media: am437x-vpfe: Streamlined vb2 buffer cleanup

Hi Benoit,

Thank you for the patch.

On Mon, Sep 9, 2019 at 5:26 PM Benoit Parrot <bparrot@...com> wrote:
>
> Returning queued vb2 buffers back to user space is a common
> task best handled by a helper function.
>
> Signed-off-by: Benoit Parrot <bparrot@...com>
> ---
>  drivers/media/platform/am437x/am437x-vpfe.c | 54 ++++++++++-----------
>  1 file changed, 26 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
> index 3a8ad9bdf283..52f7fc6e11dd 100644
> --- a/drivers/media/platform/am437x/am437x-vpfe.c
> +++ b/drivers/media/platform/am437x/am437x-vpfe.c
> @@ -1949,6 +1949,29 @@ static void vpfe_buffer_queue(struct vb2_buffer *vb)
>         spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
>  }
>
> +static void vpfe_return_all_buffers(struct vpfe_device *vpfe,
> +                                   enum vb2_buffer_state state)
> +{
> +       struct vpfe_cap_buffer *buf, *node;
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
> +       list_for_each_entry_safe(buf, node, &vpfe->dma_queue, list) {
> +               vb2_buffer_done(&buf->vb.vb2_buf, state);
> +               list_del(&buf->list);
> +       }
> +
> +       if (vpfe->cur_frm)
> +               vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf, state);
> +
> +       if (vpfe->next_frm && vpfe->next_frm != vpfe->cur_frm)
> +               vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf, state);
> +
> +       vpfe->cur_frm = NULL;
> +       vpfe->next_frm = NULL;
> +       spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
> +}
> +
>  /*
>   * vpfe_start_streaming : Starts the DMA engine for streaming
>   * @vb: ptr to vb2_buffer
> @@ -1957,7 +1980,6 @@ static void vpfe_buffer_queue(struct vb2_buffer *vb)
>  static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
>  {
>         struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
> -       struct vpfe_cap_buffer *buf, *tmp;
>         struct vpfe_subdev_info *sdinfo;
>         unsigned long flags;
>         unsigned long addr;
> @@ -2003,11 +2025,8 @@ static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
>         return 0;
>
>  err:
> -       list_for_each_entry_safe(buf, tmp, &vpfe->dma_queue, list) {
> -               list_del(&buf->list);
> -               vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> -       }
> -
> +       vpfe_return_all_buffers(vpfe, VB2_BUF_STATE_QUEUED);
> +       vpfe_pcr_enable(&vpfe->ccdc, 0);

please create a seperate patch for the above change.

Cheers,
--Prabhakar Lad

>         return ret;
>  }
>
> @@ -2022,7 +2041,6 @@ static void vpfe_stop_streaming(struct vb2_queue *vq)
>  {
>         struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
>         struct vpfe_subdev_info *sdinfo;
> -       unsigned long flags;
>         int ret;
>
>         vpfe_pcr_enable(&vpfe->ccdc, 0);
> @@ -2040,27 +2058,7 @@ static void vpfe_stop_streaming(struct vb2_queue *vq)
>                 vpfe_dbg(1, vpfe, "stream off failed in subdev\n");
>
>         /* release all active buffers */
> -       spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
> -       if (vpfe->cur_frm == vpfe->next_frm) {
> -               vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf,
> -                               VB2_BUF_STATE_ERROR);
> -       } else {
> -               if (vpfe->cur_frm != NULL)
> -                       vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf,
> -                                       VB2_BUF_STATE_ERROR);
> -               if (vpfe->next_frm != NULL)
> -                       vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf,
> -                                       VB2_BUF_STATE_ERROR);
> -       }
> -
> -       while (!list_empty(&vpfe->dma_queue)) {
> -               vpfe->next_frm = list_entry(vpfe->dma_queue.next,
> -                                               struct vpfe_cap_buffer, list);
> -               list_del(&vpfe->next_frm->list);
> -               vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf,
> -                               VB2_BUF_STATE_ERROR);
> -       }
> -       spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
> +       vpfe_return_all_buffers(vpfe, VB2_BUF_STATE_ERROR);
>  }
>
>  static int vpfe_g_pixelaspect(struct file *file, void *priv,
> --
> 2.17.1
>