From patchwork Thu Jul 28 14:28:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 12931394 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 66CB8C25B0D for ; Thu, 28 Jul 2022 14:36:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232599AbiG1OgL (ORCPT ); Thu, 28 Jul 2022 10:36:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232654AbiG1OfM (ORCPT ); Thu, 28 Jul 2022 10:35:12 -0400 Received: from mail.baikalelectronics.com (unknown [87.245.175.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id AE1C132DAD for ; Thu, 28 Jul 2022 07:34:32 -0700 (PDT) Received: from mail (mail.baikal.int [192.168.51.25]) by mail.baikalelectronics.com (Postfix) with ESMTP id 1B8E35BC7; Thu, 28 Jul 2022 17:31:20 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.baikalelectronics.com 1B8E35BC7 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baikalelectronics.ru; s=mail; t=1659018680; bh=h2szMtPt2mPxz+bvBYoY3CVT2HKJ3ds0tWkMm2QE3qQ=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=CDDnxEN/eHon8gQLlhKhcWxAxnyIxHrwBGyiBFhWYT2zBQS2Rg00B+5vyVupSzhsB z8QOLT/ssRLiUh8giRCNuXmNvN5rMd6MBcjVCTmde/1AHAuxB4iwFZDYNU6+fjC8jm IDy+nC2PnTHffmD/PwGLo0NlUTrnwthV4sl+jJ/o= Received: from localhost (192.168.53.207) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 28 Jul 2022 17:28:55 +0300 From: Serge Semin To: Gustavo Pimentel , Vinod Koul , Rob Herring , Bjorn Helgaas , Lorenzo Pieralisi , Jingoo Han , Frank Li , Manivannan Sadhasivam CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , =?utf-8?q?Krzys?= =?utf-8?q?ztof_Wilczy=C5=84ski?= , , , Subject: [PATCH v4 11/24] dmaengine: dw-edma: Stop checking debugfs_create_*() return value Date: Thu, 28 Jul 2022 17:28:28 +0300 Message-ID: <20220728142841.12305-12-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20220728142841.12305-1-Sergey.Semin@baikalelectronics.ru> References: <20220728142841.12305-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org First of all they never return NULL. So checking their return value for being not NULL just pointless. Secondly the DebugFS subsystem is designed in a way to be used as simple as possible. So if one of the debugfs_create_*() method in a hierarchy fails, the following methods will just silently return the passed erroneous parental dentry. Finally the code is supposed to be working no matter whether anything DebugFS-related fails. So in order to make code simpler and DebugFS-independent let's drop the debugfs_create_*() methods return value checking in the same way as the most of the kernel drivers do. Note in order to preserve some memory space we suggest to skip the DebugFS nodes initialization if the file system in unavailable. Signed-off-by: Serge Semin Reviewed-by: Manivannan Sadhasivam Tested-by: Manivannan Sadhasivam Acked-By: Vinod Koul --- drivers/dma/dw-edma/dw-edma-v0-debugfs.c | 20 +++++--------------- 1 file changed, 5 insertions(+), 15 deletions(-) diff --git a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c index 8e61810dea4b..6e7f3ef60ca7 100644 --- a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c +++ b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c @@ -100,9 +100,8 @@ static void dw_edma_debugfs_create_x32(const struct debugfs_entries entries[], int i; for (i = 0; i < nr_entries; i++) { - if (!debugfs_create_file_unsafe(entries[i].name, 0444, dir, - entries[i].reg, &fops_x32)) - break; + debugfs_create_file_unsafe(entries[i].name, 0444, dir, + entries[i].reg, &fops_x32); } } @@ -168,8 +167,6 @@ static void dw_edma_debugfs_regs_wr(struct dentry *dir) char name[16]; regs_dir = debugfs_create_dir(WRITE_STR, dir); - if (!regs_dir) - return; nr_entries = ARRAY_SIZE(debugfs_regs); dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir); @@ -184,8 +181,6 @@ static void dw_edma_debugfs_regs_wr(struct dentry *dir) snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i); ch_dir = debugfs_create_dir(name, regs_dir); - if (!ch_dir) - return; dw_edma_debugfs_regs_ch(®s->type.unroll.ch[i].wr, ch_dir); @@ -237,8 +232,6 @@ static void dw_edma_debugfs_regs_rd(struct dentry *dir) char name[16]; regs_dir = debugfs_create_dir(READ_STR, dir); - if (!regs_dir) - return; nr_entries = ARRAY_SIZE(debugfs_regs); dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir); @@ -253,8 +246,6 @@ static void dw_edma_debugfs_regs_rd(struct dentry *dir) snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i); ch_dir = debugfs_create_dir(name, regs_dir); - if (!ch_dir) - return; dw_edma_debugfs_regs_ch(®s->type.unroll.ch[i].rd, ch_dir); @@ -273,8 +264,6 @@ static void dw_edma_debugfs_regs(void) int nr_entries; regs_dir = debugfs_create_dir(REGISTERS_STR, dw->debugfs); - if (!regs_dir) - return; nr_entries = ARRAY_SIZE(debugfs_regs); dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir); @@ -285,6 +274,9 @@ static void dw_edma_debugfs_regs(void) void dw_edma_v0_debugfs_on(struct dw_edma *_dw) { + if (!debugfs_initialized()) + return; + dw = _dw; if (!dw) return; @@ -294,8 +286,6 @@ void dw_edma_v0_debugfs_on(struct dw_edma *_dw) return; dw->debugfs = debugfs_create_dir(dw->name, NULL); - if (!dw->debugfs) - return; debugfs_create_u32("mf", 0444, dw->debugfs, &dw->chip->mf); debugfs_create_u16("wr_ch_cnt", 0444, dw->debugfs, &dw->wr_ch_cnt);