On Wed, 28 Apr 2021 16:52:39 +0200
Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> wrote:
> Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> added pm_runtime_resume_and_get() in order to automatically handle
> dev->power.usage_count decrement on errors.
>
> While there's nothing wrong with the current usage on this driver,
> as we're getting rid of the pm_runtime_get_sync() call all over
> the media subsystem, let's remove the last occurrence on this
> driver.
Not sure there is nothing wrong in here before your patch...
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
> ---
> drivers/staging/media/hantro/hantro_drv.c | 23 ++++++++++++++++-------
> 1 file changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index 595e82a82728..25fa36e7e773 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -56,14 +56,12 @@ dma_addr_t hantro_get_ref(struct hantro_ctx *ctx, u64 ts)
> return hantro_get_dec_buf_addr(ctx, buf);
> }
>
> -static void hantro_job_finish(struct hantro_dev *vpu,
> - struct hantro_ctx *ctx,
> - enum vb2_buffer_state result)
> +static void hantro_job_finish_no_pm(struct hantro_dev *vpu,
> + struct hantro_ctx *ctx,
> + enum vb2_buffer_state result)
> {
> struct vb2_v4l2_buffer *src, *dst;
>
> - pm_runtime_mark_last_busy(vpu->dev);
> - pm_runtime_put_autosuspend(vpu->dev);
> clk_bulk_disable(vpu->variant->num_clocks, vpu->clocks);
>
> src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
> @@ -81,6 +79,16 @@ static void hantro_job_finish(struct hantro_dev *vpu,
> result);
> }
>
> +static void hantro_job_finish(struct hantro_dev *vpu,
> + struct hantro_ctx *ctx,
> + enum vb2_buffer_state result)
> +{
> + pm_runtime_mark_last_busy(vpu->dev);
> + pm_runtime_put_autosuspend(vpu->dev);
> +
> + hantro_job_finish_no_pm(vpu, ctx, result);
> +}
> +
> void hantro_irq_done(struct hantro_dev *vpu,
> enum vb2_buffer_state result)
> {
> @@ -155,7 +163,8 @@ static void device_run(void *priv)
> ret = clk_bulk_enable(ctx->dev->variant->num_clocks, ctx->dev->clocks);
> if (ret)
> goto err_cancel_job;
Before your patch, if this error condition happened, we'd call runtime_put
before the related runtime_get... You fixed that, but the patch description
doesn't call it out.
> - ret = pm_runtime_get_sync(ctx->dev->dev);
> +
> + ret = pm_runtime_resume_and_get(ctx->dev->dev);
> if (ret < 0)
> goto err_cancel_job;
>
> @@ -165,7 +174,7 @@ static void device_run(void *priv)
> return;
>
> err_cancel_job:
> - hantro_job_finish(ctx->dev, ctx, VB2_BUF_STATE_ERROR);
> + hantro_job_finish_no_pm(ctx->dev, ctx, VB2_BUF_STATE_ERROR);
> }
>
> static struct v4l2_m2m_ops vpu_m2m_ops = {
