From: Thomas Zimmermann <tzimmermann@suse•de>
To: "Maxime Ripard" <mripard@kernel•org>,
"Maarten Lankhorst" <maarten.lankhorst@linux•intel.com>,
"David Airlie" <airlied@gmail•com>,
"Simona Vetter" <simona@ffwll•ch>,
"Jonathan Corbet" <corbet@lwn•net>,
"Shuah Khan" <skhan@linuxfoundation•org>,
"Dmitry Baryshkov" <dmitry.baryshkov@oss•qualcomm.com>,
"Jyri Sarha" <jyri.sarha@iki•fi>,
"Tomi Valkeinen" <tomi.valkeinen@ideasonboard•com>,
"Andrzej Hajda" <andrzej.hajda@intel•com>,
"Neil Armstrong" <neil.armstrong@linaro•org>,
"Robert Foss" <rfoss@kernel•org>,
"Laurent Pinchart" <Laurent.pinchart@ideasonboard•com>,
"Jonas Karlman" <jonas@kwiboo•se>,
"Jernej Skrabec" <jernej.skrabec@gmail•com>,
"Simon Ser" <contact@emersion•fr>,
"Harry Wentland" <harry.wentland@amd•com>,
"Melissa Wen" <mwen@igalia•com>,
"Sebastian Wick" <sebastian.wick@redhat•com>,
"Alex Hung" <alex.hung@amd•com>,
"Jani Nikula" <jani.nikula@linux•intel.com>,
"Rodrigo Vivi" <rodrigo.vivi@intel•com>,
"Joonas Lahtinen" <joonas.lahtinen@linux•intel.com>,
"Tvrtko Ursulin" <tursulin@ursulin•net>,
"Chen-Yu Tsai" <wens@kernel•org>,
"Samuel Holland" <samuel@sholland•org>,
"Dave Stevenson" <dave.stevenson@raspberrypi•com>,
"Maíra Canal" <mcanal@igalia•com>,
"Raspberry Pi Kernel Maintenance" <kernel-list@raspberrypi•com>
Cc: dri-devel@lists•freedesktop.org, linux-doc@vger•kernel.org,
linux-kernel@vger•kernel.org,
Daniel Stone <daniels@collabora•com>,
intel-gfx@lists•freedesktop.org, intel-xe@lists•freedesktop.org,
linux-arm-kernel@lists•infradead.org,
linux-sunxi@lists•linux.dev,
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard•com>
Subject: Re: [PATCH v5 03/19] drm/atomic: Drop drm_private_obj.state assignment from create_state
Date: Tue, 26 May 2026 11:03:07 +0200 [thread overview]
Message-ID: <0f581544-69aa-4d88-9b72-9341a4c847ea@suse.de> (raw)
In-Reply-To: <20260519-drm-mode-config-init-v5-3-388b03321e38@kernel.org>
Am 19.05.26 um 11:01 schrieb Maxime Ripard:
> The initial intent of the atomic_create_state hook was to simply
> allocate a proper drm_private_state and return it, without any side
> effect.
>
> However, __drm_atomic_helper_private_obj_create_state(), which most
> atomic_create_state implementations call, introduces a side effect by
> setting drm_private_obj.state to the newly allocated state.
>
> This assignment defeats the purpose, but is also redundant since
> drm_atomic_private_obj_init(), the only call site for the
> atomic_create_state hook, will also set this pointer to the newly
> allocated state.
>
> Drop the assignment in __drm_atomic_helper_private_obj_create_state().
>
> Fixes: e7be39ed1716 ("drm/atomic-helper: Add private_obj atomic_create_state helper")
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard•com>
> Signed-off-by: Maxime Ripard <mripard@kernel•org>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse•de>
> ---
> drivers/gpu/drm/drm_atomic_state_helper.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> index cc70508d4fdb..a82568d87e4f 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> @@ -729,12 +729,10 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
> void __drm_atomic_helper_private_obj_create_state(struct drm_private_obj *obj,
> struct drm_private_state *state)
> {
> if (state)
> state->obj = obj;
> -
> - obj->state = state;
> }
> EXPORT_SYMBOL(__drm_atomic_helper_private_obj_create_state);
>
> /**
> * __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state
>
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)
next prev parent reply other threads:[~2026-05-26 9:03 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-19 9:01 [PATCH v5 00/19] drm/atomic: Rework initial state allocation Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 01/19] drm/atomic: Document atomic commit lifetime Maxime Ripard
2026-05-26 8:59 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 02/19] drm/colorop: Fix typos in the doc Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 03/19] drm/atomic: Drop drm_private_obj.state assignment from create_state Maxime Ripard
2026-05-26 9:03 ` Thomas Zimmermann [this message]
2026-05-19 9:01 ` [PATCH v5 04/19] drm/atomic: Expand atomic_create_state expectations for drm_private_obj Maxime Ripard
2026-05-26 9:03 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 05/19] drm/mode-config: Document drm_private_obj exclusion from drm_mode_config_reset() Maxime Ripard
2026-05-26 9:05 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 06/19] drm/colorop: Rename __drm_colorop_state_reset() Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 07/19] drm/colorop: Create drm_atomic_helper_colorop_create_state() Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 08/19] drm/atomic-state-helper: Fix __drm_atomic_helper_plane_reset() doc typo Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 09/19] drm/atomic-state-helper: Rename __drm_atomic_helper_plane_state_reset() Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 10/19] drm/plane: Add new atomic_create_state callback Maxime Ripard
2026-05-26 9:08 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 11/19] drm/atomic-state-helper: Rename __drm_atomic_helper_crtc_state_reset() Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 12/19] drm/crtc: Add new atomic_create_state callback Maxime Ripard
2026-05-26 9:22 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 13/19] drm/atomic-state-helper: Rename __drm_atomic_helper_connector_state_reset() Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 14/19] drm/hdmi: Rename __drm_atomic_helper_connector_hdmi_reset() Maxime Ripard
2026-05-19 9:01 ` [PATCH v5 15/19] drm/connector: Add new atomic_create_state callback Maxime Ripard
2026-05-26 9:28 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 16/19] drm/mode-config: Create drm_mode_config_create_initial_state() Maxime Ripard
2026-05-26 9:33 ` Thomas Zimmermann
2026-05-19 9:01 ` [PATCH v5 17/19] drm/drv: Switch skeleton to drm_mode_config_create_initial_state() Maxime Ripard
2026-05-26 9:34 ` Thomas Zimmermann
2026-05-19 9:02 ` [PATCH v5 18/19] drm/tidss: Convert to atomic_create_state Maxime Ripard
2026-05-19 9:02 ` [PATCH v5 19/19] drm/bridge_connector: " Maxime Ripard
2026-05-26 9:36 ` [PATCH v5 00/19] drm/atomic: Rework initial state allocation Thomas Zimmermann
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