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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 BC44EC433F5 for ; Mon, 20 Sep 2021 18:18:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 99F6761A0B for ; Mon, 20 Sep 2021 18:18:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351507AbhITSTj (ORCPT ); Mon, 20 Sep 2021 14:19:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:60636 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357777AbhITSE7 (ORCPT ); Mon, 20 Sep 2021 14:04:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 00E2E61A53; Mon, 20 Sep 2021 17:17:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632158243; bh=PmciNb1mslTz2KO6YkVfzL4onW7x4xImscmzoQGHHek=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NMJN0ho17859Sq/gX26eNaabMvr4MbcM36bqmd83KmIxsLlcMTSUP5k4PVjIKEqGj mEB1U6UJeoalbQtDM97rhBKWurvICL1rbGk6jZpeozKKISuBolTJ3sL6fv5yHHWvfH CNzgQ8VViukc8ypG7LZ6nsLN0GT1Wn91HyF2Y4GQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anthony Iliopoulos , Christoph Hellwig , Sasha Levin Subject: [PATCH 5.4 049/260] dma-debug: fix debugfs initialization order Date: Mon, 20 Sep 2021 18:41:07 +0200 Message-Id: <20210920163932.773468371@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163931.123590023@linuxfoundation.org> References: <20210920163931.123590023@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anthony Iliopoulos [ Upstream commit 173735c346c412d9f084825ecb04f24ada0e2986 ] Due to link order, dma_debug_init is called before debugfs has a chance to initialize (via debugfs_init which also happens in the core initcall stage), so the directories for dma-debug are never created. Decouple dma_debug_fs_init from dma_debug_init and defer its init until core_initcall_sync (after debugfs has been initialized) while letting dma-debug initialization occur as soon as possible to catch any early mappings, as suggested in [1]. [1] https://lore.kernel.org/linux-iommu/YIgGa6yF%2Fadg8OSN@kroah.com/ Fixes: 15b28bbcd567 ("dma-debug: move initialization to common code") Signed-off-by: Anthony Iliopoulos Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- kernel/dma/debug.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index cb6425e52bf7..01e893cf9b9f 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -846,7 +846,7 @@ static int dump_show(struct seq_file *seq, void *v) } DEFINE_SHOW_ATTRIBUTE(dump); -static void dma_debug_fs_init(void) +static int __init dma_debug_fs_init(void) { struct dentry *dentry = debugfs_create_dir("dma-api", NULL); @@ -859,7 +859,10 @@ static void dma_debug_fs_init(void) debugfs_create_u32("nr_total_entries", 0444, dentry, &nr_total_entries); debugfs_create_file("driver_filter", 0644, dentry, NULL, &filter_fops); debugfs_create_file("dump", 0444, dentry, NULL, &dump_fops); + + return 0; } +core_initcall_sync(dma_debug_fs_init); static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) { @@ -944,8 +947,6 @@ static int dma_debug_init(void) spin_lock_init(&dma_entry_hash[i].lock); } - dma_debug_fs_init(); - nr_pages = DIV_ROUND_UP(nr_prealloc_entries, DMA_DEBUG_DYNAMIC_ENTRIES); for (i = 0; i < nr_pages; ++i) dma_debug_create_entries(GFP_KERNEL); -- 2.30.2