From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 047601E25E1; Thu, 17 Apr 2025 18:01:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744912902; cv=none; b=MAYTVa/h8CQZbV6FSVZ8Je10j4hkdk+50vUMiAljVIKbRuxdL7rCHwoHQ5Y2OTyljs1vIY3+GYyHH9GLmbcX1wMb06vTnu0JOV1Kk0v4yZmARlpHBDmPK40odkL6ZIfPId+cq6+6gYIvpyekAkw3MF+gLCDWfiHj9NUFV42GSDw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744912902; c=relaxed/simple; bh=rPzFcXGxWtNF33LNRHmjFnHf/phpyFt/r3dWH3Mrnns=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WY/HuT5arUqMgf9c6dH926VOlD4nYmIoUa7TInyO+KtsbiU6ilOmZkn74f7DLCm1qtYEyBGuP/dB/7RCMX0H+zM1UBvFoeIPph5byVTsjEQkVFbm/vzX6F2wn9PaY0OJ7GLeOAvJ8FK+pBRJX4ridgA746gP8YhiqarHOv0QZ08= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tUiyfOcc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="tUiyfOcc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8BBE1C4CEE4; Thu, 17 Apr 2025 18:01:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744912901; bh=rPzFcXGxWtNF33LNRHmjFnHf/phpyFt/r3dWH3Mrnns=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tUiyfOccatYo8Y64llQDSQGDLbdPH8b0aV+J6sm7JDJt+L71meYCs0VxYbPGzbLey goXaMXw9RvZOm7xucd3DWuQVZMrH4Y4xCJkES7frdXSKPn/1eMrw9wUqXbZca70p9E 3vroMtdYjiISMcFbNK22LXjmuWDgRoLhIOst8mx8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dmitry Baryshkov , Luca Ceresoli , Robert Foss , Sasha Levin Subject: [PATCH 6.14 161/449] drm/bridge: panel: forbid initializing a panel with unknown connector type Date: Thu, 17 Apr 2025 19:47:29 +0200 Message-ID: <20250417175124.468222144@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250417175117.964400335@linuxfoundation.org> References: <20250417175117.964400335@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Luca Ceresoli [ Upstream commit b296955b3a740ecc8b3b08e34fd64f1ceabb8fb4 ] Having an DRM_MODE_CONNECTOR_Unknown connector type is considered bad, and drm_panel_bridge_add_typed() and derivatives are deprecated for this. drm_panel_init() won't prevent initializing a panel with a DRM_MODE_CONNECTOR_Unknown connector type. Luckily there are no in-tree users doing it, so take this as an opportinuty to document a valid connector type must be passed. Returning an error if this rule is violated is not possible because drm_panel_init() is a void function. Add at least a warning to make any violations noticeable, especially to non-upstream drivers. Reviewed-by: Dmitry Baryshkov Signed-off-by: Luca Ceresoli Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20250214-drm-assorted-cleanups-v7-5-88ca5827d7af@bootlin.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/drm_panel.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index 9940e96d35e30..c627e42a7ce70 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -50,7 +50,7 @@ static LIST_HEAD(panel_list); * @dev: parent device of the panel * @funcs: panel operations * @connector_type: the connector type (DRM_MODE_CONNECTOR_*) corresponding to - * the panel interface + * the panel interface (must NOT be DRM_MODE_CONNECTOR_Unknown) * * Initialize the panel structure for subsequent registration with * drm_panel_add(). @@ -58,6 +58,9 @@ static LIST_HEAD(panel_list); void drm_panel_init(struct drm_panel *panel, struct device *dev, const struct drm_panel_funcs *funcs, int connector_type) { + if (connector_type == DRM_MODE_CONNECTOR_Unknown) + DRM_WARN("%s: %s: a valid connector type is required!\n", __func__, dev_name(dev)); + INIT_LIST_HEAD(&panel->list); INIT_LIST_HEAD(&panel->followers); mutex_init(&panel->follower_lock); -- 2.39.5