linux-kernel - Re: [Freedreno] [PATCH] drm: Remove redundant 'flush

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Date:   Tue, 12 Oct 2021 09:09:23 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>,
        jyri.sarha@....fi, tomba@...nel.org,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Zack Rusin <zackr@...are.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        The etnaviv authors <etnaviv@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [Freedreno] [PATCH] drm: Remove redundant 'flush_workqueue()' calls

On Sun, Oct 10, 2021 at 7:07 AM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> 'destroy_workqueue()' already drains the queue before destroying it, so
> there is no need to flush it explicitly.
>
> Remove the redundant 'flush_workqueue()' calls.
>
> This was generated with coccinelle:
>
> @@
> expression E;
> @@
> -       flush_workqueue(E);
>         destroy_workqueue(E);
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

For drm/msm:

Reviewed-by: Rob Clark <robdclark@...il.com>

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 1 -
>  drivers/gpu/drm/msm/dsi/dsi_host.c    | 1 -
>  drivers/gpu/drm/msm/edp/edp_ctrl.c    | 1 -
>  drivers/gpu/drm/msm/hdmi/hdmi.c       | 4 +---
>  drivers/gpu/drm/tilcdc/tilcdc_drv.c   | 4 +---
>  drivers/gpu/drm/vmwgfx/ttm_memory.c   | 1 -
>  6 files changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index 789acae37f55..06bde46df451 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1733,7 +1733,6 @@ static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
>
>         DBG("%s", dev_name(gpu->dev));
>
> -       flush_workqueue(gpu->wq);
>         destroy_workqueue(gpu->wq);
>
>         etnaviv_sched_fini(gpu);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index c86b5090fae6..462ea65ebf89 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1925,7 +1925,6 @@ void msm_dsi_host_destroy(struct mipi_dsi_host *host)
>         DBG("");
>         dsi_tx_buf_free(msm_host);
>         if (msm_host->workqueue) {
> -               flush_workqueue(msm_host->workqueue);
>                 destroy_workqueue(msm_host->workqueue);
>                 msm_host->workqueue = NULL;
>         }
> diff --git a/drivers/gpu/drm/msm/edp/edp_ctrl.c b/drivers/gpu/drm/msm/edp/edp_ctrl.c
> index fe1366b4c49f..07129a6e5dbb 100644
> --- a/drivers/gpu/drm/msm/edp/edp_ctrl.c
> +++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c
> @@ -1190,7 +1190,6 @@ void msm_edp_ctrl_destroy(struct edp_ctrl *ctrl)
>                 return;
>
>         if (ctrl->workqueue) {
> -               flush_workqueue(ctrl->workqueue);
>                 destroy_workqueue(ctrl->workqueue);
>                 ctrl->workqueue = NULL;
>         }
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> index 737453b6e596..5ba7c8f28419 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> @@ -61,10 +61,8 @@ static void msm_hdmi_destroy(struct hdmi *hdmi)
>          * at this point, hpd has been disabled,
>          * after flush workq, it's safe to deinit hdcp
>          */
> -       if (hdmi->workq) {
> -               flush_workqueue(hdmi->workq);
> +       if (hdmi->workq)
>                 destroy_workqueue(hdmi->workq);
> -       }
>         msm_hdmi_hdcp_destroy(hdmi);
>
>         if (hdmi->phy_dev) {
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> index 6b03f89a98d4..3ddb7c710a3d 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> @@ -186,10 +186,8 @@ static void tilcdc_fini(struct drm_device *dev)
>         if (priv->mmio)
>                 iounmap(priv->mmio);
>
> -       if (priv->wq) {
> -               flush_workqueue(priv->wq);
> +       if (priv->wq)
>                 destroy_workqueue(priv->wq);
> -       }
>
>         dev->dev_private = NULL;
>
> diff --git a/drivers/gpu/drm/vmwgfx/ttm_memory.c b/drivers/gpu/drm/vmwgfx/ttm_memory.c
> index edd17c30d5a5..7f7fe35fc21d 100644
> --- a/drivers/gpu/drm/vmwgfx/ttm_memory.c
> +++ b/drivers/gpu/drm/vmwgfx/ttm_memory.c
> @@ -468,7 +468,6 @@ void ttm_mem_global_release(struct ttm_mem_global *glob)
>         struct ttm_mem_zone *zone;
>         unsigned int i;
>
> -       flush_workqueue(glob->swap_queue);
>         destroy_workqueue(glob->swap_queue);
>         glob->swap_queue = NULL;
>         for (i = 0; i < glob->num_zones; ++i) {
> --
> 2.30.2
>