From patchwork Tue Feb 8 21:08:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 12739348 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 8825BC433F5 for ; Tue, 8 Feb 2022 21:09:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 468EB10E5B9; Tue, 8 Feb 2022 21:08:51 +0000 (UTC) Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by gabe.freedesktop.org (Postfix) with ESMTPS id 43A3810E55C for ; Tue, 8 Feb 2022 21:08:48 +0000 (UTC) Received: by mail-wm1-x32a.google.com with SMTP id q198-20020a1ca7cf000000b0037bb52545c6so2005369wme.1 for ; Tue, 08 Feb 2022 13:08:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZpkV0RtV6b+qoZSx1q7At4dbITHQdztu2MpUTGszUSQ=; b=XBxwj0okLWcXjnLZC8VylTpr8kVr/cRQvzFH0baQxLV3Ag48btF75FnQSiNzw2+6VD mv4OqAjPHJGITMkt/3V8/uxvtQ0r4+UQCO5GX+qxMgmsCuyTs0uabU9J7oJGYb8c6Iow n/zSAwN9FJlnot4fK6xQ8YNOvjOBpzPLNjj0c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ZpkV0RtV6b+qoZSx1q7At4dbITHQdztu2MpUTGszUSQ=; b=8LCVunoXEITXP4PU+7HPfTRfFIEjSBxXUqohBqKYJk3fzUXn0opxWoc8W5V+vklWza UYGoUnbfpNCjo2OyG5GFUlJsrKy59r5nX2Qv8+ZgBqloFBACJnoXPY68bdENZdYE8krO pi62knHOWO07G+/6iB68Oc1e4Xa+G8RtBFY+4cjZ45LcqmyyDLCdLhtv0Xi52bW+TAqU 3WEqAv7RuZfzyruaqIfNEQlXhb3wThafeyO1nJf3YdPo2JoKvjht7WbIwbXjDguHRbXF KLv6UHYmRyFJDlCphT23iBZWScmtRbmGRcZvzkTb7xaymxIBVB5APv6UJ8+H8srlzZe3 beKA== X-Gm-Message-State: AOAM532UME8ladOzw5TCrzOamwnc62EiZ/aH559rJ54ZpEZyppZaYDFK TZnNBRsv8t5MVrN1ygJIuhdDT1FVjEdJFA== X-Google-Smtp-Source: ABdhPJynSn4cJJu2QmKl6qJIPVpol64suJAmeSMzFGBHBZrxWj3fvOdAZeounKrNlr8/sZP5nXwPjQ== X-Received: by 2002:a05:600c:308:: with SMTP id q8mr2548459wmd.71.1644354526664; Tue, 08 Feb 2022 13:08:46 -0800 (PST) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id o14sm3033561wmr.3.2022.02.08.13.08.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Feb 2022 13:08:44 -0800 (PST) From: Daniel Vetter To: DRI Development Subject: [PATCH v2 09/19] fbcon: Extract fbcon_open/release helpers Date: Tue, 8 Feb 2022 22:08:14 +0100 Message-Id: <20220208210824.2238981-10-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220208210824.2238981-1-daniel.vetter@ffwll.ch> References: <20220208210824.2238981-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 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: , Cc: linux-fbdev@vger.kernel.org, Du Cheng , Tetsuo Handa , Daniel Vetter , Intel Graphics Development , LKML , Claudio Suarez , Greg Kroah-Hartman , Daniel Vetter , Sam Ravnborg Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" There's two minor behaviour changes in here: - in error paths we now consistently call fb_ops->fb_release - fb_release really can't fail (fbmem.c ignores it too) and there's no reasonable cleanup we can do anyway. Note that everything in fbcon.c is protected by the big console_lock() lock (especially all the global variables), so the minor changes in ordering of setup/cleanup do not matter. v2: Explain a bit better why this is all correct (Sam) Acked-by: Sam Ravnborg Signed-off-by: Daniel Vetter Cc: Daniel Vetter Cc: Claudio Suarez Cc: Greg Kroah-Hartman Cc: Tetsuo Handa Cc: Du Cheng --- drivers/video/fbdev/core/fbcon.c | 107 +++++++++++++++---------------- 1 file changed, 53 insertions(+), 54 deletions(-) diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index 058e885d24f6..3e1a3e7bf527 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -682,19 +682,37 @@ static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount) #endif /* CONFIG_MISC_TILEBLITTING */ +static int fbcon_open(struct fb_info *info) +{ + if (!try_module_get(info->fbops->owner)) + return -ENODEV; + + if (info->fbops->fb_open && + info->fbops->fb_open(info, 0)) { + module_put(info->fbops->owner); + return -ENODEV; + } + + return 0; +} + +static void fbcon_release(struct fb_info *info) +{ + if (info->fbops->fb_release) + info->fbops->fb_release(info, 0); + + module_put(info->fbops->owner); +} static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info, int unit, int oldidx) { struct fbcon_ops *ops = NULL; - int err = 0; - - if (!try_module_get(info->fbops->owner)) - err = -ENODEV; + int err; - if (!err && info->fbops->fb_open && - info->fbops->fb_open(info, 0)) - err = -ENODEV; + err = fbcon_open(info); + if (err) + return err; if (!err) { ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL); @@ -715,7 +733,7 @@ static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info, if (err) { con2fb_map[unit] = oldidx; - module_put(info->fbops->owner); + fbcon_release(info); } return err; @@ -726,45 +744,34 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo, int oldidx, int found) { struct fbcon_ops *ops = oldinfo->fbcon_par; - int err = 0, ret; + int ret; - if (oldinfo->fbops->fb_release && - oldinfo->fbops->fb_release(oldinfo, 0)) { - con2fb_map[unit] = oldidx; - if (!found && newinfo->fbops->fb_release) - newinfo->fbops->fb_release(newinfo, 0); - if (!found) - module_put(newinfo->fbops->owner); - err = -ENODEV; - } + fbcon_release(oldinfo); - if (!err) { - fbcon_del_cursor_work(oldinfo); - kfree(ops->cursor_state.mask); - kfree(ops->cursor_data); - kfree(ops->cursor_src); - kfree(ops->fontbuffer); - kfree(oldinfo->fbcon_par); - oldinfo->fbcon_par = NULL; - module_put(oldinfo->fbops->owner); - /* - If oldinfo and newinfo are driving the same hardware, - the fb_release() method of oldinfo may attempt to - restore the hardware state. This will leave the - newinfo in an undefined state. Thus, a call to - fb_set_par() may be needed for the newinfo. - */ - if (newinfo && newinfo->fbops->fb_set_par) { - ret = newinfo->fbops->fb_set_par(newinfo); + fbcon_del_cursor_work(oldinfo); + kfree(ops->cursor_state.mask); + kfree(ops->cursor_data); + kfree(ops->cursor_src); + kfree(ops->fontbuffer); + kfree(oldinfo->fbcon_par); + oldinfo->fbcon_par = NULL; + /* + If oldinfo and newinfo are driving the same hardware, + the fb_release() method of oldinfo may attempt to + restore the hardware state. This will leave the + newinfo in an undefined state. Thus, a call to + fb_set_par() may be needed for the newinfo. + */ + if (newinfo && newinfo->fbops->fb_set_par) { + ret = newinfo->fbops->fb_set_par(newinfo); - if (ret) - printk(KERN_ERR "con2fb_release_oldinfo: " - "detected unhandled fb_set_par error, " - "error code %d\n", ret); - } + if (ret) + printk(KERN_ERR "con2fb_release_oldinfo: " + "detected unhandled fb_set_par error, " + "error code %d\n", ret); } - return err; + return 0; } static void con2fb_init_display(struct vc_data *vc, struct fb_info *info, @@ -919,7 +926,6 @@ static const char *fbcon_startup(void) struct fbcon_display *p = &fb_display[fg_console]; struct vc_data *vc = vc_cons[fg_console].d; const struct font_desc *font = NULL; - struct module *owner; struct fb_info *info = NULL; struct fbcon_ops *ops; int rows, cols; @@ -938,17 +944,12 @@ static const char *fbcon_startup(void) if (!info) return NULL; - owner = info->fbops->owner; - if (!try_module_get(owner)) + if (fbcon_open(info)) return NULL; - if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) { - module_put(owner); - return NULL; - } ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL); if (!ops) { - module_put(owner); + fbcon_release(info); return NULL; } @@ -3314,10 +3315,6 @@ static void fbcon_exit(void) } if (mapped) { - if (info->fbops->fb_release) - info->fbops->fb_release(info, 0); - module_put(info->fbops->owner); - if (info->fbcon_par) { struct fbcon_ops *ops = info->fbcon_par; @@ -3327,6 +3324,8 @@ static void fbcon_exit(void) kfree(info->fbcon_par); info->fbcon_par = NULL; } + + fbcon_release(info); } } }