From patchwork Mon May 31 13:14:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 451244 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=-19.1 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, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 D1C6BC47083 for ; Mon, 31 May 2021 13:34:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B6A186192A for ; Mon, 31 May 2021 13:34:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232369AbhEaNg1 (ORCPT ); Mon, 31 May 2021 09:36:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:40214 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232708AbhEaNeV (ORCPT ); Mon, 31 May 2021 09:34:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 83396613EE; Mon, 31 May 2021 13:24:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622467489; bh=NVhnBFxxbsod3bZ71tcKvqdmuRUUR+JQxC8nBsemxoY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yOMBNZcleDlUyUMShTXu7y6Tr8O+TTkNrVNKyBhtiNZQQ+dRf7e3plpmM6tkoAXPV Hggp1O33Ur2FqC7T/L9/DsG55hBOsGHxtLaL5wiJqYDM2A/3C8qA7EZ+zN/PUshZS2 N7PEKloboCRcc2Uh7FccxM1EpGHbqJLVanlryNfM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sean Young , Mauro Carvalho Chehab , Alaa Emad , Sasha Levin Subject: [PATCH 4.19 085/116] media: dvb: Add check on sp8870_readreg return Date: Mon, 31 May 2021 15:14:21 +0200 Message-Id: <20210531130643.030295334@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531130640.131924542@linuxfoundation.org> References: <20210531130640.131924542@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alaa Emad [ Upstream commit c6d822c56e7fd29e6fa1b1bb91b98f6a1e942b3c ] The function sp8870_readreg returns a negative value when i2c_transfer fails so properly check for this and return the error if it happens. Cc: Sean Young Cc: Mauro Carvalho Chehab Signed-off-by: Alaa Emad Link: https://lore.kernel.org/r/20210503115736.2104747-60-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/media/dvb-frontends/sp8870.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/media/dvb-frontends/sp8870.c b/drivers/media/dvb-frontends/sp8870.c index 8d31cf3f4f07..3a577788041d 100644 --- a/drivers/media/dvb-frontends/sp8870.c +++ b/drivers/media/dvb-frontends/sp8870.c @@ -293,7 +293,9 @@ static int sp8870_set_frontend_parameters(struct dvb_frontend *fe) sp8870_writereg(state, 0xc05, reg0xc05); // read status reg in order to clear pending irqs - sp8870_readreg(state, 0x200); + err = sp8870_readreg(state, 0x200); + if (err < 0) + return err; // system controller start sp8870_microcontroller_start(state);