linux-kernel - Re: [PATCH 06/15] drm/tegra: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL

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Message-ID: <20210917153805.GF2515@art_vandelay>
Date:   Fri, 17 Sep 2021 11:38:05 -0400
From:   Sean Paul <sean@...rly.run>
To:     Fernando Ramos <greenfoo@....eu>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        sean@...rly.run, linux-doc@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 06/15] drm/tegra: cleanup: drm_modeset_lock_all() -->
 DRM_MODESET_LOCK_ALL_BEGIN()

On Thu, Sep 16, 2021 at 11:15:43PM +0200, Fernando Ramos wrote:
> As requested in Documentation/gpu/todo.rst, replace driver calls to
> drm_modeset_lock_all() with DRM_MODESET_LOCK_ALL_BEGIN() and
> DRM_MODESET_LOCK_ALL_END()
> 
> Signed-off-by: Fernando Ramos <greenfoo@....eu>
> ---
>  drivers/gpu/drm/tegra/dsi.c  |  6 ++++--
>  drivers/gpu/drm/tegra/hdmi.c |  5 +++--
>  drivers/gpu/drm/tegra/sor.c  | 10 ++++++----
>  3 files changed, 13 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
> index f46d377f0c30..77a496f6a2e9 100644
> --- a/drivers/gpu/drm/tegra/dsi.c
> +++ b/drivers/gpu/drm/tegra/dsi.c
> @@ -202,10 +202,12 @@ static int tegra_dsi_show_regs(struct seq_file *s, void *data)
>  	struct tegra_dsi *dsi = node->info_ent->data;
>  	struct drm_crtc *crtc = dsi->output.encoder.crtc;
>  	struct drm_device *drm = node->minor->dev;
> +	struct drm_modeset_acquire_ctx ctx;
>  	unsigned int i;
>  	int err = 0;
> +	int ret;

You can use err here instead. With that fixed,

Reviewed-by: Sean Paul <sean@...rly.run>


>  
> -	drm_modeset_lock_all(drm);
> +	DRM_MODESET_LOCK_ALL_BEGIN(drm, ctx, 0, ret);
>  
>  	if (!crtc || !crtc->state->active) {
>  		err = -EBUSY;
> @@ -220,7 +222,7 @@ static int tegra_dsi_show_regs(struct seq_file *s, void *data)
>  	}
>  
>  unlock:
> -	drm_modeset_unlock_all(drm);
> +	DRM_MODESET_LOCK_ALL_END(drm, ctx, ret);
>  	return err;
>  }
>  
> diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
> index e5d2a4026028..669a2ebb55ae 100644
> --- a/drivers/gpu/drm/tegra/hdmi.c
> +++ b/drivers/gpu/drm/tegra/hdmi.c
> @@ -1031,10 +1031,11 @@ static int tegra_hdmi_show_regs(struct seq_file *s, void *data)
>  	struct tegra_hdmi *hdmi = node->info_ent->data;
>  	struct drm_crtc *crtc = hdmi->output.encoder.crtc;
>  	struct drm_device *drm = node->minor->dev;
> +	struct drm_modeset_acquire_ctx ctx;
>  	unsigned int i;
>  	int err = 0;
>  
> -	drm_modeset_lock_all(drm);
> +	DRM_MODESET_LOCK_ALL_BEGIN(drm, ctx, 0, err);
>  
>  	if (!crtc || !crtc->state->active) {
>  		err = -EBUSY;
> @@ -1049,7 +1050,7 @@ static int tegra_hdmi_show_regs(struct seq_file *s, void *data)
>  	}
>  
>  unlock:
> -	drm_modeset_unlock_all(drm);
> +	DRM_MODESET_LOCK_ALL_END(drm, ctx, err);
>  	return err;
>  }
>  
> diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
> index 0ea320c1092b..323d95eb0cac 100644
> --- a/drivers/gpu/drm/tegra/sor.c
> +++ b/drivers/gpu/drm/tegra/sor.c
> @@ -1490,10 +1490,11 @@ static int tegra_sor_show_crc(struct seq_file *s, void *data)
>  	struct tegra_sor *sor = node->info_ent->data;
>  	struct drm_crtc *crtc = sor->output.encoder.crtc;
>  	struct drm_device *drm = node->minor->dev;
> +	struct drm_modeset_acquire_ctx ctx;
>  	int err = 0;
>  	u32 value;
>  
> -	drm_modeset_lock_all(drm);
> +	DRM_MODESET_LOCK_ALL_BEGIN(drm, ctx, 0, err);
>  
>  	if (!crtc || !crtc->state->active) {
>  		err = -EBUSY;
> @@ -1522,7 +1523,7 @@ static int tegra_sor_show_crc(struct seq_file *s, void *data)
>  	seq_printf(s, "%08x\n", value);
>  
>  unlock:
> -	drm_modeset_unlock_all(drm);
> +	DRM_MODESET_LOCK_ALL_END(drm, ctx, err);
>  	return err;
>  }
>  
> @@ -1652,10 +1653,11 @@ static int tegra_sor_show_regs(struct seq_file *s, void *data)
>  	struct tegra_sor *sor = node->info_ent->data;
>  	struct drm_crtc *crtc = sor->output.encoder.crtc;
>  	struct drm_device *drm = node->minor->dev;
> +	struct drm_modeset_acquire_ctx ctx;
>  	unsigned int i;
>  	int err = 0;
>  
> -	drm_modeset_lock_all(drm);
> +	DRM_MODESET_LOCK_ALL_BEGIN(drm, ctx, 0, err);
>  
>  	if (!crtc || !crtc->state->active) {
>  		err = -EBUSY;
> @@ -1670,7 +1672,7 @@ static int tegra_sor_show_regs(struct seq_file *s, void *data)
>  	}
>  
>  unlock:
> -	drm_modeset_unlock_all(drm);
> +	DRM_MODESET_LOCK_ALL_END(drm, ctx, err);
>  	return err;
>  }
>  
> -- 
> 2.33.0
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS