From patchwork Fri Jan 24 09:27:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 232850 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 28A2AC2D0DB for ; Fri, 24 Jan 2020 11:38:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F40DB20708 for ; Fri, 24 Jan 2020 11:38:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579865926; bh=T2msdhaNQCsm0T6KFI8eG9oaSDpjsXAisNKeTEz1U7g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ez06SGlHDodA4RAi3xRGAJzMm/OKl+cowAnnFf1HA84qFC3kHAevcLw/k06jImwNn 17ZoRPUBq63/3TD6ACuOCeWXeYerNkFuACjpvHuz892unD6/YEIluB5+Hjp0UamfCS 2+MRiSPbNspGKOIJZgO9XWXhZQDl+rpPxXsGe/bE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389147AbgAXLip (ORCPT ); Fri, 24 Jan 2020 06:38:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:58624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388814AbgAXLim (ORCPT ); Fri, 24 Jan 2020 06:38:42 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 21E52206F0; Fri, 24 Jan 2020 11:38:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579865921; bh=T2msdhaNQCsm0T6KFI8eG9oaSDpjsXAisNKeTEz1U7g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G8Dll1/Tl08wGgZvQpyFTswsXMVmtc8B/zy2fLeUxsuAkQSfngh8dgHqqWGqk0xeK 0tzGd/ybJ7NI0lwfETNOKR5fvReOFZWgOk+QKxxzPS/dp4sqceOgU/Ryk5kY43WIsk +XQ3vH4o57VaW8mqJSbVRFe8piunTYlMK9q9LtWI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arnd Bergmann , Nathan Chancellor , "Lad, Prabhakar" , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 4.19 280/639] media: davinci-isif: avoid uninitialized variable use Date: Fri, 24 Jan 2020 10:27:30 +0100 Message-Id: <20200124093121.894530370@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Arnd Bergmann [ Upstream commit 0e633f97162c1c74c68e2eb20bbd9259dce87cd9 ] clang warns about a possible variable use that gcc never complained about: drivers/media/platform/davinci/isif.c:982:32: error: variable 'frame_size' is uninitialized when used here [-Werror,-Wuninitialized] dm365_vpss_set_pg_frame_size(frame_size); ^~~~~~~~~~ drivers/media/platform/davinci/isif.c:887:2: note: variable 'frame_size' is declared here struct vpss_pg_frame_size frame_size; ^ 1 error generated. There is no initialization for this variable at all, and there has never been one in the mainline kernel, so we really should not put that stack data into an mmio register. On the other hand, I suspect that gcc checks the condition more closely and notices that the global isif_cfg.bayer.config_params.test_pat_gen flag is initialized to zero and never written to from any code path, so anything depending on it can be eliminated. To shut up the clang warning, just remove the dead code manually, it has probably never been used because any attempt to do so would have resulted in undefined behavior. Fixes: 63e3ab142fa3 ("V4L/DVB: V4L - vpfe capture - source for ISIF driver on DM365") Signed-off-by: Arnd Bergmann Reviewed-by: Nathan Chancellor Acked-by: Lad, Prabhakar Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/platform/davinci/isif.c | 9 --------- 1 file changed, 9 deletions(-) diff --git a/drivers/media/platform/davinci/isif.c b/drivers/media/platform/davinci/isif.c index 340f8218f54d3..80fa60a4c4489 100644 --- a/drivers/media/platform/davinci/isif.c +++ b/drivers/media/platform/davinci/isif.c @@ -884,9 +884,7 @@ static int isif_set_hw_if_params(struct vpfe_hw_if_param *params) static int isif_config_ycbcr(void) { struct isif_ycbcr_config *params = &isif_cfg.ycbcr; - struct vpss_pg_frame_size frame_size; u32 modeset = 0, ccdcfg = 0; - struct vpss_sync_pol sync; dev_dbg(isif_cfg.dev, "\nStarting isif_config_ycbcr..."); @@ -974,13 +972,6 @@ static int isif_config_ycbcr(void) /* two fields are interleaved in memory */ regw(0x00000249, SDOFST); - /* Setup test pattern if enabled */ - if (isif_cfg.bayer.config_params.test_pat_gen) { - sync.ccdpg_hdpol = params->hd_pol; - sync.ccdpg_vdpol = params->vd_pol; - dm365_vpss_set_sync_pol(sync); - dm365_vpss_set_pg_frame_size(frame_size); - } return 0; }