From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5CC03C282CE for ; Mon, 11 Feb 2019 14:32:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 134F220844 for ; Mon, 11 Feb 2019 14:32:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895533; bh=GjvTZ6JmuAvkzkUcGQM4nIRPqeioaPU6Sbz1RfycSPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MLjMJObWRIhaGTwpLuqJbsgt0x1akIZcx9Ba+kIT2W0R+nGkNqnfrJ5V9ok4dOJ/x NP2Uteg/7AF5boMmbElOsf3/tb6NZ9z84hRhu6NK1fgFGyHsoNqpNASe3wxyAIIyuj HNXDBPkVVnwibfgjAAC44ELzJgN7l59RZK2nndWg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730125AbfBKOcL (ORCPT ); Mon, 11 Feb 2019 09:32:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:39384 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728028AbfBKOcI (ORCPT ); Mon, 11 Feb 2019 09:32:08 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 784E8214DA; Mon, 11 Feb 2019 14:32:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895528; bh=GjvTZ6JmuAvkzkUcGQM4nIRPqeioaPU6Sbz1RfycSPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WdXobGqLxuGawvs44i5z6E/H48VvNT1IcqnkVaeH2EaqPi7PzNce1k8/GzgonFNqq 7444v+qhTXy8ZHiah6LvGk2KWWC8b7zbPhoWwdMhjgtaZpmrSgJYM3Wef7oWQNGh5Q Iw8YLhd3te5Rk7BDY67TCqZJHtmmnYzc6+f9qR+4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Rosin , Tomi Valkeinen , Fabian Frederick , Geert Uytterhoeven , Geoff Levand , James Simmons , Bartlomiej Zolnierkiewicz , Sasha Levin Subject: [PATCH 4.20 234/352] fbdev: fbmem: behave better with small rotated displays and many CPUs Date: Mon, 11 Feb 2019 15:17:41 +0100 Message-Id: <20190211141902.086042105@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit f75df8d4b4fabfad7e3cba2debfad12741c6fde7 ] Blitting an image with "negative" offsets is not working since there is no clipping. It hopefully just crashes. For the bootup logo, there is protection so that blitting does not happen as the image is drawn further and further to the right (ROTATE_UR) or further and further down (ROTATE_CW). There is however no protection when drawing in the opposite directions (ROTATE_UD and ROTATE_CCW). Add back this protection. The regression is 20-odd years old but the mindless warning-killing mentality displayed in commit 34bdb666f4b2 ("fbdev: fbmem: remove positive test on unsigned values") is also to blame, methinks. Fixes: 448d479747b8 ("fbdev: fb_do_show_logo() updates") Signed-off-by: Peter Rosin Cc: Tomi Valkeinen Cc: Fabian Frederick Cc: Geert Uytterhoeven cc: Geoff Levand Cc: James Simmons Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Sasha Levin --- drivers/video/fbdev/core/fbmem.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 861bf8081619..7dd6924feaa8 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -436,7 +436,9 @@ static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, image->dx += image->width + 8; } } else if (rotate == FB_ROTATE_UD) { - for (x = 0; x < num; x++) { + u32 dx = image->dx; + + for (x = 0; x < num && image->dx <= dx; x++) { info->fbops->fb_imageblit(info, image); image->dx -= image->width + 8; } @@ -448,7 +450,9 @@ static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, image->dy += image->height + 8; } } else if (rotate == FB_ROTATE_CCW) { - for (x = 0; x < num; x++) { + u32 dy = image->dy; + + for (x = 0; x < num && image->dy <= dy; x++) { info->fbops->fb_imageblit(info, image); image->dy -= image->height + 8; } -- 2.19.1