From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162730AbdEWVYD (ORCPT ); Tue, 23 May 2017 17:24:03 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:49352 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1032445AbdEWUdr (ORCPT ); Tue, 23 May 2017 16:33:47 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Simon Baatz , Boris Brezillon Subject: [PATCH 4.9 154/164] mtd: nand: orion: fix clk handling Date: Tue, 23 May 2017 22:09:31 +0200 Message-Id: <20170523200913.689798067@linuxfoundation.org> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170523200907.297534241@linuxfoundation.org> References: <20170523200907.297534241@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Simon Baatz commit 675b11d94ce9baa5eb365a51b35d2793f77c8ab8 upstream. The clk handling in orion_nand.c had two problems: - In the probe function, clk_put() was called for an enabled clock, which violates the API (see documentation for clk_put() in include/linux/clk.h) - In the error path of the probe function, clk_put() could be called twice for the same clock. In order to clean this up, use the managed function devm_clk_get() and store the pointer to the clk in the driver data. Fixes: baffab28b13120694fa3ebab08d3e99667a851d2 ('ARM: Orion: fix driver probe error handling with respect to clk') Signed-off-by: Simon Baatz Signed-off-by: Boris Brezillon Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/orion_nand.c | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) --- a/drivers/mtd/nand/orion_nand.c +++ b/drivers/mtd/nand/orion_nand.c @@ -23,6 +23,11 @@ #include #include +struct orion_nand_info { + struct nand_chip chip; + struct clk *clk; +}; + static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *nc = mtd_to_nand(mtd); @@ -75,20 +80,21 @@ static void orion_nand_read_buf(struct m static int __init orion_nand_probe(struct platform_device *pdev) { + struct orion_nand_info *info; struct mtd_info *mtd; struct nand_chip *nc; struct orion_nand_data *board; struct resource *res; - struct clk *clk; void __iomem *io_base; int ret = 0; u32 val = 0; - nc = devm_kzalloc(&pdev->dev, - sizeof(struct nand_chip), + info = devm_kzalloc(&pdev->dev, + sizeof(struct orion_nand_info), GFP_KERNEL); - if (!nc) + if (!info) return -ENOMEM; + nc = &info->chip; mtd = nand_to_mtd(nc); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -145,15 +151,13 @@ static int __init orion_nand_probe(struc if (board->dev_ready) nc->dev_ready = board->dev_ready; - platform_set_drvdata(pdev, mtd); + platform_set_drvdata(pdev, info); /* Not all platforms can gate the clock, so it is not an error if the clock does not exists. */ - clk = clk_get(&pdev->dev, NULL); - if (!IS_ERR(clk)) { - clk_prepare_enable(clk); - clk_put(clk); - } + info->clk = devm_clk_get(&pdev->dev, NULL); + if (!IS_ERR(info->clk)) + clk_prepare_enable(info->clk); if (nand_scan(mtd, 1)) { ret = -ENXIO; @@ -170,26 +174,22 @@ static int __init orion_nand_probe(struc return 0; no_dev: - if (!IS_ERR(clk)) { - clk_disable_unprepare(clk); - clk_put(clk); - } + if (!IS_ERR(info->clk)) + clk_disable_unprepare(info->clk); return ret; } static int orion_nand_remove(struct platform_device *pdev) { - struct mtd_info *mtd = platform_get_drvdata(pdev); - struct clk *clk; + struct orion_nand_info *info = platform_get_drvdata(pdev); + struct nand_chip *chip = &info->chip; + struct mtd_info *mtd = nand_to_mtd(chip); nand_release(mtd); - clk = clk_get(&pdev->dev, NULL); - if (!IS_ERR(clk)) { - clk_disable_unprepare(clk); - clk_put(clk); - } + if (!IS_ERR(info->clk)) + clk_disable_unprepare(info->clk); return 0; }