From patchwork Mon Dec 16 16:40:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Ceresoli X-Patchwork-Id: 13910040 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 868DAE7717F for ; Mon, 16 Dec 2024 16:41:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E510410E6F8; Mon, 16 Dec 2024 16:41:16 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="TfXKhGw1"; dkim-atps=neutral Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) by gabe.freedesktop.org (Postfix) with ESMTPS id 537B610E60F for ; Mon, 16 Dec 2024 16:41:13 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id CB879E0003; Mon, 16 Dec 2024 16:41:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1734367271; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=J90J1NyXaKoXccZe2X72ycchhXTtGFZ2PH6GpQkBJsQ=; b=TfXKhGw1Xu1kMTIPHWCUs8aLwUWzuTKGvJ4j91Qfd6r0hlmwy9jqbDGUa3nK9YjKpnJnwP cK53r5KYTSI9yx8tH/zjuFZhBWgUTpbaJX8x06dQO4fSlDokEEimr5TcZHmb5krbdJ60hL FMAd7Z8uS7G/ROKDCzU156r1kC6R8C231T1QzABHhYsQA1nX8PrulSaGWMogyY1wzibSjU bsqZCDq+mHrv4t5A5dfbxYfHsK4DAh9lOKJ4L7A9IPeve9fYNtC6WAmruHJSg/a8cPNZhk 8lp0QQaqPShbNAC1lTe4zRpFQxtsqtF9rE8Ajky47TvAs297yqgUvcnumi+Jgw== From: Luca Ceresoli Date: Mon, 16 Dec 2024 17:40:50 +0100 Subject: [PATCH RESEND v3 3/4] drm/mode_object: add drm_mode_object_read_refcount() MIME-Version: 1.0 Message-Id: <20241216-drm-small-improvements-v3-3-78bbc95ac776@bootlin.com> References: <20241216-drm-small-improvements-v3-0-78bbc95ac776@bootlin.com> In-Reply-To: <20241216-drm-small-improvements-v3-0-78bbc95ac776@bootlin.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: Dmitry Baryshkov , Jani Nikula , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Luca Ceresoli , Louis Chauvet X-Mailer: b4 0.14.2 X-GND-Sasl: luca.ceresoli@bootlin.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add a wrapper to kref_read() just like the ones already in place for kref_get() and kref_put(). This will be used for sanity checks on object lifetime. Signed-off-by: Luca Ceresoli Acked-by: Louis Chauvet --- Changed in v3: * use conventions for 'Returns' doc syntax * ditch DRM_DEBUG() and as a consequence rework and simplify the entire function * fix function name in kerneldoc --- drivers/gpu/drm/drm_mode_object.c | 17 +++++++++++++++++ include/drm/drm_mode_object.h | 1 + 2 files changed, 18 insertions(+) diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c index df4cc0e8e263d5887a799cf1a61d998234be7158..b9a16aceb926782eb033434eb6967ce9fd2e94f7 100644 --- a/drivers/gpu/drm/drm_mode_object.c +++ b/drivers/gpu/drm/drm_mode_object.c @@ -217,6 +217,23 @@ void drm_mode_object_get(struct drm_mode_object *obj) } EXPORT_SYMBOL(drm_mode_object_get); +/** + * drm_mode_object_read_refcount - read the refcount for a mode object + * @obj: DRM mode object + * + * Returns: + * The current object refcount if it is a refcounted modeset object, or 0 + * for any other object. + */ +unsigned int drm_mode_object_read_refcount(struct drm_mode_object *obj) +{ + if (obj->free_cb) + return kref_read(&obj->refcount); + + return 0; +} +EXPORT_SYMBOL(drm_mode_object_read_refcount); + /** * drm_object_attach_property - attach a property to a modeset object * @obj: drm modeset object diff --git a/include/drm/drm_mode_object.h b/include/drm/drm_mode_object.h index c68edbd126d04d51221f50aa2b4166475543b59f..3d2c739e703888bf4520c61594d480f128d50e56 100644 --- a/include/drm/drm_mode_object.h +++ b/include/drm/drm_mode_object.h @@ -123,6 +123,7 @@ struct drm_mode_object *drm_mode_object_find(struct drm_device *dev, uint32_t id, uint32_t type); void drm_mode_object_get(struct drm_mode_object *obj); void drm_mode_object_put(struct drm_mode_object *obj); +unsigned int drm_mode_object_read_refcount(struct drm_mode_object *obj); int drm_object_property_set_value(struct drm_mode_object *obj, struct drm_property *property,