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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC9A9C43219 for ; Mon, 15 Nov 2021 18:04:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2D7163253 for ; Mon, 15 Nov 2021 18:04:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239741AbhKOSEn (ORCPT ); Mon, 15 Nov 2021 13:04:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:50940 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237254AbhKORYo (ORCPT ); Mon, 15 Nov 2021 12:24:44 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 910486326B; Mon, 15 Nov 2021 17:18:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636996724; bh=Gl4Xe7uU/xTaf++Ml296d66z5wC/FE2VWrA/FHOlJP0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p/85OfFsQ5m0cUzWyiwnnX/acItzzY6LW0+z+9icWFSmpEQtmJNsMIPUGxPNsqJbd dSwtkawmEMrw6h8+MT2ZW4NhdI7OM23kWSCRWZR7Lt2//FcOyaeQ587xY9LvpPlmAq PiV694EQLv5ty37/fQm5bYXn/y0EBrDmidvimMwA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Evgeny Novikov , Kirill Shilimanov , Sean Young , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.4 212/355] media: dvb-frontends: mn88443x: Handle errors of clk_prepare_enable() Date: Mon, 15 Nov 2021 18:02:16 +0100 Message-Id: <20211115165320.622767129@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165313.549179499@linuxfoundation.org> References: <20211115165313.549179499@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: Evgeny Novikov [ Upstream commit 69a10678e2fba3d182e78ea041f2d1b1a6058764 ] mn88443x_cmn_power_on() did not handle possible errors of clk_prepare_enable() and always finished successfully so that its caller mn88443x_probe() did not care about failed preparing/enabling of clocks as well. Add missed error handling in both mn88443x_cmn_power_on() and mn88443x_probe(). This required to change the return value of the former from "void" to "int". Found by Linux Driver Verification project (linuxtesting.org). Fixes: 0f408ce8941f ("media: dvb-frontends: add Socionext MN88443x ISDB-S/T demodulator driver") Signed-off-by: Evgeny Novikov Co-developed-by: Kirill Shilimanov Signed-off-by: Kirill Shilimanov Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/dvb-frontends/mn88443x.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/media/dvb-frontends/mn88443x.c b/drivers/media/dvb-frontends/mn88443x.c index e4528784f8477..fff212c0bf3b5 100644 --- a/drivers/media/dvb-frontends/mn88443x.c +++ b/drivers/media/dvb-frontends/mn88443x.c @@ -204,11 +204,18 @@ struct mn88443x_priv { struct regmap *regmap_t; }; -static void mn88443x_cmn_power_on(struct mn88443x_priv *chip) +static int mn88443x_cmn_power_on(struct mn88443x_priv *chip) { + struct device *dev = &chip->client_s->dev; struct regmap *r_t = chip->regmap_t; + int ret; - clk_prepare_enable(chip->mclk); + ret = clk_prepare_enable(chip->mclk); + if (ret) { + dev_err(dev, "Failed to prepare and enable mclk: %d\n", + ret); + return ret; + } gpiod_set_value_cansleep(chip->reset_gpio, 1); usleep_range(100, 1000); @@ -222,6 +229,8 @@ static void mn88443x_cmn_power_on(struct mn88443x_priv *chip) } else { regmap_write(r_t, HIZSET3, 0x8f); } + + return 0; } static void mn88443x_cmn_power_off(struct mn88443x_priv *chip) @@ -738,7 +747,10 @@ static int mn88443x_probe(struct i2c_client *client, chip->fe.demodulator_priv = chip; i2c_set_clientdata(client, chip); - mn88443x_cmn_power_on(chip); + ret = mn88443x_cmn_power_on(chip); + if (ret) + goto err_i2c_t; + mn88443x_s_sleep(chip); mn88443x_t_sleep(chip); -- 2.33.0