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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00590C433F5 for ; Tue, 22 Feb 2022 11:02:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:CC:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Oed0rlsGJ+o9L/W1G5i/HQW72+8mx9wU6pPmAvuvmDo=; b=mPPL7cxpBVX2lQp6SZhwpf17A1 JoEvIevYKoK+hAlE9+EWIkN+qm49vExxTj/Vc+ODCpd/4I5LEuq2Am5lHeg7UrH6q23AH2qZwBAq2 5ymzhamHXrtSdeRKNElmvFN5xerMrVzFMbNHmBdV6O8/UzUdJGKHpgmhtTS6Q9fEljhMFMhEGDDEj 25upd6WkF1lzO2W/20mUiMZQ9p1npB4QZPAbn6iTDzBrKD84gDQSs1BMpNwOwinRtWDS9bdngC+qN WWJJ8qfQHtJcj3rffilrRmHuKmqOxZEtvwnrZIsQcWzTqerEnm+gqz78+f/LgujycpoFKXbao8fvQ +KNlo3eQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMSuG-009GpT-5G; Tue, 22 Feb 2022 11:00:33 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMSoV-009DZi-Po for linux-arm-kernel@lists.infradead.org; Tue, 22 Feb 2022 10:54:38 +0000 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 21M9PpLE004215; Tue, 22 Feb 2022 11:54:15 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=selector1; bh=eyPV2WHrs60DIefFS3PzEvweoMxStSGvtgWsUpYbsgQ=; b=c+16qZyVN9Tj5TaYjnG/16ROtJ1e/mpPK0NFcoCu/9/bwNnW3wxw4uF4uOmKeMk0e3Gh JGA7tEpo61C4wHtAs+cXJjNldTK0I07mKwOQIdBPfOCBabMRVbfEPosl21X5JUahVsce iQ29O2rWmvfH+3+vDti1nsVnPZpRRkH5QQyAQSuY+4UeG2TYrv6k3t2TKoxODI6Odiqm PmKoFN1ya63dU71s9G3tcuWDEiJZBQfVPz5zycXf75TY9Pp2frk2F46XLMZUWMpcxQo7 UOHq6k7sytmIy+K2PB7wijEkYYmu565acr4XlItWA0xbK6QdNSN6r1FCiFowMf3TGNb9 Aw== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3ecq13jjsa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 22 Feb 2022 11:54:15 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 67229100034; Tue, 22 Feb 2022 11:54:13 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node1.st.com [10.75.127.4]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 53FB221B52E; Tue, 22 Feb 2022 11:54:13 +0100 (CET) Received: from lmecxl0993.lme.st.com (10.75.127.45) by SFHDAG2NODE1.st.com (10.75.127.4) with Microsoft SMTP Server (TLS) id 15.0.1497.26; Tue, 22 Feb 2022 11:54:12 +0100 Subject: Re: [PATCH] drm/stm: Avoid using val uninitialized in ltdc_set_ycbcr_config() To: Nick Desaulniers , Nathan Chancellor CC: Yannick Fertre , Benjamin Gaignard , , , , , References: <20220207165304.1046867-1-nathan@kernel.org> From: Philippe CORNU Message-ID: <430ee06d-04e7-3b8b-bf11-48a7b62eaf18@foss.st.com> Date: Tue, 22 Feb 2022 11:54:04 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG2NODE2.st.com (10.75.127.5) To SFHDAG2NODE1.st.com (10.75.127.4) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-22_02,2022-02-21_02,2021-12-02_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220222_025436_213893_830C0770 X-CRM114-Status: GOOD ( 25.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/7/22 8:44 PM, Nick Desaulniers wrote: > On Mon, Feb 7, 2022 at 8:53 AM Nathan Chancellor wrote: >> >> Clang warns: >> >> drivers/gpu/drm/stm/ltdc.c:625:2: warning: variable 'val' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized] >> default: >> ^~~~~~~ >> drivers/gpu/drm/stm/ltdc.c:635:2: note: uninitialized use occurs here >> val |= LxPCR_YCEN; >> ^~~ >> drivers/gpu/drm/stm/ltdc.c:600:9: note: initialize the variable 'val' to silence this warning >> u32 val; >> ^ >> = 0 >> 1 warning generated. >> >> Use a return instead of break in the default case to fix the warning. >> Add an error message so that this return is not silent, which could hide >> issues in the future. >> >> Fixes: 484e72d3146b ("drm/stm: ltdc: add support of ycbcr pixel formats") >> Link: https://github.com/ClangBuiltLinux/linux/issues/1575 >> Signed-off-by: Nathan Chancellor >> --- >> drivers/gpu/drm/stm/ltdc.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c >> index 5eeb32c9c9ce..447ddde1786c 100644 >> --- a/drivers/gpu/drm/stm/ltdc.c >> +++ b/drivers/gpu/drm/stm/ltdc.c >> @@ -624,7 +624,8 @@ static inline void ltdc_set_ycbcr_config(struct drm_plane *plane, u32 drm_pix_fm >> break; >> default: >> /* RGB or not a YCbCr supported format */ >> - break; >> + drm_err(plane->dev, "Unsupported pixel format: %u\n", drm_pix_fmt); > > This is fine, but in the future you should add an explicit > #include > to avoid implicit header dependencies (like the ones that Mingo is > trying to detangle) for the declaration of drm_err. `drm_vprintf` > needs it, too. > > Reviewed-by: Nick Desaulniers > Hi Nick, and thank you for having pointing this. Hi Nathan, May I ask you please to update your patch changing drm_err(plane->dev, ) with DRM_ERROR(). Big thank you, Philippe :-) >> + return; >> } >> >> /* Enable limited range */ >> >> base-commit: 542898c5aa5c6a3179dffb1d1606884a63f75fed >> -- >> 2.35.1 >> > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel