From patchwork Tue Jun 13 11:07:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 692396 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FEEFCA9EB6 for ; Tue, 13 Jun 2023 11:10:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239420AbjFMLK5 (ORCPT ); Tue, 13 Jun 2023 07:10:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242127AbjFMLKI (ORCPT ); Tue, 13 Jun 2023 07:10:08 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65E8010DE; Tue, 13 Jun 2023 04:10:07 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 0EF4B1FDAC; Tue, 13 Jun 2023 11:10:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1686654606; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1BuztNQSgsuQs3xHFrmB515HWtrc7sc9NpbsuatwBeo=; b=xYlSFG6CqucP0AReBtnHoo9yOCqWmGRx8GiCt5Gl58QihD8IuNDmW8CKS8A31iXb6fJ0RS eA04EwkVntJVCWq1v5ccReJin3qLpPO5q9lbtp6VsRnJL5aYmpQmAFAaF1BSYIXPB3fcru z/js7oMGW+T8ByW/8u7MYj6rNxOsmmA= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1686654606; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1BuztNQSgsuQs3xHFrmB515HWtrc7sc9NpbsuatwBeo=; b=MjJP+zQHwfGIHEIKvXvJwGD1mOWq2Pl3tjwOzzD3olGhg/J6xuIu2PdQewP/5i/xU66Izm X35Ljej+qj7Kg5Bg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id B1E4513483; Tue, 13 Jun 2023 11:10:05 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id aJ+qKo1OiGR8CQAAMHmgww (envelope-from ); Tue, 13 Jun 2023 11:10:05 +0000 From: Thomas Zimmermann To: daniel@ffwll.ch, javierm@redhat.com, sam@ravnborg.org, deller@gmx.de, geert+renesas@glider.be, lee@kernel.org, daniel.thompson@linaro.org, jingoohan1@gmail.com, dan.carpenter@linaro.org, michael.j.ruhl@intel.com Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-sh@vger.kernel.org, linux-omap@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Thomas Zimmermann , Steve Glendinning Subject: [PATCH v3 30/38] fbdev/smscufx: Detect registered fb_info from refcount Date: Tue, 13 Jun 2023 13:07:05 +0200 Message-ID: <20230613110953.24176-31-tzimmermann@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230613110953.24176-1-tzimmermann@suse.de> References: <20230613110953.24176-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Detect registered instances of fb_info by reading the reference counter from struct fb_info.read. Avoids looking at the dev field and prepares fbdev for making struct fb_info.dev optional. Signed-off-by: Thomas Zimmermann Cc: Steve Glendinning Reviewed-by: Javier Martinez Canillas --- drivers/video/fbdev/smscufx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/smscufx.c b/drivers/video/fbdev/smscufx.c index 17cec62cc65db..adb2b1fe8383c 100644 --- a/drivers/video/fbdev/smscufx.c +++ b/drivers/video/fbdev/smscufx.c @@ -1496,7 +1496,7 @@ static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info, u8 *edid; int i, result = 0, tries = 3; - if (info->dev) /* only use mutex if info has been registered */ + if (refcount_read(&info->count)) /* only use mutex if info has been registered */ mutex_lock(&info->lock); edid = kmalloc(EDID_LENGTH, GFP_KERNEL); @@ -1610,7 +1610,7 @@ static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info, if (edid && (dev->edid != edid)) kfree(edid); - if (info->dev) + if (refcount_read(&info->count)) mutex_unlock(&info->lock); return result;