From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Date: Wed, 29 May 2019 15:04:35 +0000 Subject: Re: [PATCH][next] drm/i915: fix uninitialized variable 'subslice_mask' Message-Id: <87lfyp47zw.fsf@intel.com> List-Id: References: <20190529144325.17235-1-colin.king@canonical.com> In-Reply-To: <20190529144325.17235-1-colin.king@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Colin King , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Stuart Summers , Daniele Ceraolo Spurio , kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org On Wed, 29 May 2019, Colin King wrote: > From: Colin Ian King > > Currently subslice_mask is not initialized and so data is being > bit-wise or'd into a garbage value. Fix this by inintializing > subslice_mask to zero. > > Addresses-Coverity: ("Uninitialized scalar variable") > Fixes: 1ac159e23c2c ("drm/i915: Expand subslice mask") This was already reverted for other reasons. Need to be fixed on the next round. For future reference, please Cc: author and reviewers of the referenced commit. BR, Jani. > Signed-off-by: Colin Ian King > --- > drivers/gpu/drm/i915/intel_device_info.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c > index 3625f777f3a3..d395a09b994f 100644 > --- a/drivers/gpu/drm/i915/intel_device_info.c > +++ b/drivers/gpu/drm/i915/intel_device_info.c > @@ -298,7 +298,7 @@ static void cherryview_sseu_info_init(struct drm_i915_private *dev_priv) > { > struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)->sseu; > u32 fuse; > - u8 subslice_mask; > + u8 subslice_mask = 0; > > fuse = I915_READ(CHV_FUSE_GT); -- Jani Nikula, Intel Open Source Graphics Center From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Subject: Re: [PATCH][next] drm/i915: fix uninitialized variable 'subslice_mask' Date: Wed, 29 May 2019 18:04:35 +0300 Message-ID: <87lfyp47zw.fsf@intel.com> References: <20190529144325.17235-1-colin.king@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190529144325.17235-1-colin.king@canonical.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Colin King , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Stuart Summers , Daniele Ceraolo Spurio , kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: dri-devel@lists.freedesktop.org T24gV2VkLCAyOSBNYXkgMjAxOSwgQ29saW4gS2luZyA8Y29saW4ua2luZ0BjYW5vbmljYWwuY29t PiB3cm90ZToKPiBGcm9tOiBDb2xpbiBJYW4gS2luZyA8Y29saW4ua2luZ0BjYW5vbmljYWwuY29t Pgo+Cj4gQ3VycmVudGx5IHN1YnNsaWNlX21hc2sgaXMgbm90IGluaXRpYWxpemVkIGFuZCBzbyBk YXRhIGlzIGJlaW5nCj4gYml0LXdpc2Ugb3InZCBpbnRvIGEgZ2FyYmFnZSB2YWx1ZS4gRml4IHRo aXMgYnkgaW5pbnRpYWxpemluZwo+IHN1YnNsaWNlX21hc2sgdG8gemVyby4KPgo+IEFkZHJlc3Nl cy1Db3Zlcml0eTogKCJVbmluaXRpYWxpemVkIHNjYWxhciB2YXJpYWJsZSIpCj4gRml4ZXM6IDFh YzE1OWUyM2MyYyAoImRybS9pOTE1OiBFeHBhbmQgc3Vic2xpY2UgbWFzayIpCgpUaGlzIHdhcyBh bHJlYWR5IHJldmVydGVkIGZvciBvdGhlciByZWFzb25zLiBOZWVkIHRvIGJlIGZpeGVkIG9uIHRo ZQpuZXh0IHJvdW5kLiBGb3IgZnV0dXJlIHJlZmVyZW5jZSwgcGxlYXNlIENjOiBhdXRob3IgYW5k IHJldmlld2VycyBvZiB0aGUKcmVmZXJlbmNlZCBjb21taXQuCgpCUiwKSmFuaS4KCgo+IFNpZ25l ZC1vZmYtYnk6IENvbGluIElhbiBLaW5nIDxjb2xpbi5raW5nQGNhbm9uaWNhbC5jb20+Cj4gLS0t Cj4gIGRyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2RldmljZV9pbmZvLmMgfCAyICstCj4gIDEg ZmlsZSBjaGFuZ2VkLCAxIGluc2VydGlvbigrKSwgMSBkZWxldGlvbigtKQo+Cj4gZGlmZiAtLWdp dCBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2RldmljZV9pbmZvLmMgYi9kcml2ZXJzL2dw dS9kcm0vaTkxNS9pbnRlbF9kZXZpY2VfaW5mby5jCj4gaW5kZXggMzYyNWY3NzdmM2EzLi5kMzk1 YTA5Yjk5NGYgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZGV2aWNl X2luZm8uYwo+ICsrKyBiL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2RldmljZV9pbmZvLmMK PiBAQCAtMjk4LDcgKzI5OCw3IEBAIHN0YXRpYyB2b2lkIGNoZXJyeXZpZXdfc3NldV9pbmZvX2lu aXQoc3RydWN0IGRybV9pOTE1X3ByaXZhdGUgKmRldl9wcml2KQo+ICB7Cj4gIAlzdHJ1Y3Qgc3Nl dV9kZXZfaW5mbyAqc3NldSA9ICZSVU5USU1FX0lORk8oZGV2X3ByaXYpLT5zc2V1Owo+ICAJdTMy IGZ1c2U7Cj4gLQl1OCBzdWJzbGljZV9tYXNrOwo+ICsJdTggc3Vic2xpY2VfbWFzayA9IDA7Cj4g IAo+ICAJZnVzZSA9IEk5MTVfUkVBRChDSFZfRlVTRV9HVCk7CgotLSAKSmFuaSBOaWt1bGEsIElu dGVsIE9wZW4gU291cmNlIEdyYXBoaWNzIENlbnRlcgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBs aXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1h bi9saXN0aW5mby9kcmktZGV2ZWw= 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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 4165BC28CC0 for ; Wed, 29 May 2019 15:01:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 14CAD23B5C for ; Wed, 29 May 2019 15:01:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726930AbfE2PB3 (ORCPT ); Wed, 29 May 2019 11:01:29 -0400 Received: from mga07.intel.com ([134.134.136.100]:23070 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726012AbfE2PB3 (ORCPT ); Wed, 29 May 2019 11:01:29 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 May 2019 08:01:26 -0700 X-ExtLoop1: 1 Received: from jnikula-mobl3.fi.intel.com (HELO localhost) ([10.237.66.150]) by fmsmga001.fm.intel.com with ESMTP; 29 May 2019 08:01:23 -0700 From: Jani Nikula To: Colin King , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Stuart Summers , Daniele Ceraolo Spurio Subject: Re: [PATCH][next] drm/i915: fix uninitialized variable 'subslice_mask' In-Reply-To: <20190529144325.17235-1-colin.king@canonical.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20190529144325.17235-1-colin.king@canonical.com> Date: Wed, 29 May 2019 18:04:35 +0300 Message-ID: <87lfyp47zw.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 29 May 2019, Colin King wrote: > From: Colin Ian King > > Currently subslice_mask is not initialized and so data is being > bit-wise or'd into a garbage value. Fix this by inintializing > subslice_mask to zero. > > Addresses-Coverity: ("Uninitialized scalar variable") > Fixes: 1ac159e23c2c ("drm/i915: Expand subslice mask") This was already reverted for other reasons. Need to be fixed on the next round. For future reference, please Cc: author and reviewers of the referenced commit. BR, Jani. > Signed-off-by: Colin Ian King > --- > drivers/gpu/drm/i915/intel_device_info.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c > index 3625f777f3a3..d395a09b994f 100644 > --- a/drivers/gpu/drm/i915/intel_device_info.c > +++ b/drivers/gpu/drm/i915/intel_device_info.c > @@ -298,7 +298,7 @@ static void cherryview_sseu_info_init(struct drm_i915_private *dev_priv) > { > struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)->sseu; > u32 fuse; > - u8 subslice_mask; > + u8 subslice_mask = 0; > > fuse = I915_READ(CHV_FUSE_GT); -- Jani Nikula, Intel Open Source Graphics Center