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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 1FE53C47083 for ; Fri, 4 Jun 2021 15:38:23 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BDF3A61402 for ; Fri, 4 Jun 2021 15:38:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BDF3A61402 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F2D7089FEA; Fri, 4 Jun 2021 15:38:20 +0000 (UTC) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 442456E9F8 for ; Fri, 4 Jun 2021 15:38:19 +0000 (UTC) IronPort-SDR: EPTcA3oP1QilieDdwUOy85RAhCWxioL80ZmGVSnOO5NztdY45hT84QtBLvlVuJ6+tlRyLSbv8l LovPetzBujkQ== X-IronPort-AV: E=McAfee;i="6200,9189,10005"; a="204340423" X-IronPort-AV: E=Sophos;i="5.83,248,1616482800"; d="scan'208";a="204340423" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2021 08:38:00 -0700 IronPort-SDR: 6VBT/9Yoo4WfKWOdNEnie3iaQloHdRZlHXTxDhv4gqb/YffbATGPqxsDsiL5kdV+2KG0/aVmxO pkR/p5j7CKAw== X-IronPort-AV: E=Sophos;i="5.83,248,1616482800"; d="scan'208";a="417791177" Received: from ccbilbre-mobl2.amr.corp.intel.com (HELO intel.com) ([10.254.2.203]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2021 08:37:59 -0700 Date: Fri, 4 Jun 2021 11:37:57 -0400 From: Rodrigo Vivi To: Mika Kuoppala Message-ID: References: <20210603220754.13920-1-manasi.d.navare@intel.com> <87wnr9odrq.fsf@gaia.fi.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87wnr9odrq.fsf@gaia.fi.intel.com> Subject: Re: [Intel-gfx] [PATCH v2] drm/i915: Initialize the mbus_offset to fix static analysis issue X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Fri, Jun 04, 2021 at 06:22:49PM +0300, Mika Kuoppala wrote: > Rodrigo Vivi writes: > = > > On Thu, Jun 03, 2021 at 03:07:54PM -0700, Manasi Navare wrote: > >> Static analysis identified an issue in skl_crtc_allocate_ddb where > >> mbus_offset may be used uninitialized. > >> This patch fixes it. > > > > I'm sorry, but I really cannot see what this tool is seeing... > > I even tried to look to our internal branch to see if it was an issue > > there. > > But I'm failing to see how it is possible... > = > It is in the goto out; path. indeed... thanks what a huge "out" block. For me it looks like another function and not just an "out". Could we get a refactor here? I'm afraid that setting mbus_offset =3D 0 silence the static analysis tool, but this might not be right for this "out" section. Because offset gets totally ignored. The condition to call the goto out is not that clear on why we want one or another path, so a refactor there to make things more clear is probably the best. > -Mika > = > > > >> = > >> Fixes: 835c176cb1c4 ("drm/i915: Introduce MBUS relative dbuf offsets") > >> Cc: Ville Syrj=E4l=E4 > >> Signed-off-by: Manasi Navare > >> --- > >> drivers/gpu/drm/i915/intel_pm.c | 2 +- > >> 1 file changed, 1 insertion(+), 1 deletion(-) > >> = > >> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/in= tel_pm.c > >> index 00f3dead20ad..a385b8b7414f 100644 > >> --- a/drivers/gpu/drm/i915/intel_pm.c > >> +++ b/drivers/gpu/drm/i915/intel_pm.c > >> @@ -4163,7 +4163,7 @@ skl_crtc_allocate_ddb(struct intel_atomic_state = *state, struct intel_crtc *crtc) > >> struct intel_crtc_state *crtc_state; > >> struct skl_ddb_entry ddb_slices; > >> enum pipe pipe =3D crtc->pipe; > >> - unsigned int mbus_offset; > >> + unsigned int mbus_offset =3D 0; > >> u32 ddb_range_size; > >> u32 dbuf_slice_mask; > >> u32 start, end; > >> -- = > >> 2.19.1 > >> = > >> _______________________________________________ > >> Intel-gfx mailing list > >> Intel-gfx@lists.freedesktop.org > >> https://lists.freedesktop.org/mailman/listinfo/intel-gfx > > _______________________________________________ > > Intel-gfx mailing list > > Intel-gfx@lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx