From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleksandr Andrushchenko Date: Tue, 21 Apr 2020 12:54:25 +0000 Subject: Re: [bug report] drm/xen-front: Add support for Xen PV display frontend Message-Id: List-Id: References: <20200421104522.GA86681@mwanda> <28cc7f7c-fe0a-fd06-d330-73531b818a79@epam.com> <20200421115112.GB2682@kadam> In-Reply-To: <20200421115112.GB2682@kadam> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Dan Carpenter Cc: "xen-devel@lists.xenproject.org" , "kernel-janitors@vger.kernel.org" , "dri-devel@lists.freedesktop.org" T24gNC8yMS8yMCAxNDo1MSwgRGFuIENhcnBlbnRlciB3cm90ZToNCj4gSXQgdHVybnMgb3V0IHRo ZXJlIGFyZW4ndCB0aGF0IG1hbnkgb2YgdGhlc2UgaW4geGVuLg0KPg0KPiAkIGdyZXAgSVNfRVJS X09SX05VTEwgZHJpdmVycy9ncHUvZHJtL3hlbi8gLVJuDQo+IGRyaXZlcnMvZ3B1L2RybS94ZW4v eGVuX2RybV9mcm9udF9rbXMuYzo2MzogICAgIGlmIChJU19FUlJfT1JfTlVMTChmYikpDQo+IGRy aXZlcnMvZ3B1L2RybS94ZW4veGVuX2RybV9mcm9udF9nZW0uYzo4NjogICAgIGlmIChJU19FUlJf T1JfTlVMTCh4ZW5fb2JqKSkNCj4gZHJpdmVycy9ncHUvZHJtL3hlbi94ZW5fZHJtX2Zyb250X2dl bS5jOjEyMDogICAgaWYgKElTX0VSUl9PUl9OVUxMKHhlbl9vYmotPnBhZ2VzKSkgew0KPiBkcml2 ZXJzL2dwdS9kcm0veGVuL3hlbl9kcm1fZnJvbnRfZ2VtLmM6MTM5OiAgICBpZiAoSVNfRVJSX09S X05VTEwoeGVuX29iaikpDQo+IGRyaXZlcnMvZ3B1L2RybS94ZW4veGVuX2RybV9mcm9udF9nZW0u YzoxOTc6ICAgIGlmIChJU19FUlJfT1JfTlVMTCh4ZW5fb2JqKSkNCj4gZHJpdmVycy9ncHUvZHJt L3hlbi94ZW5fZHJtX2Zyb250LmM6NDAzOiAgICAgICAgaWYgKElTX0VSUl9PUl9OVUxMKG9iaikp IHsNCj4NCj4gVGhleSdyZSBhbGwgd3JvbmcsIGJlY2F1c2UgaWYgdGhlIHBvaW50ZXIgd2FzIHJl YWxseSBOVUxMIHRoZW4gaXQncw0KPiBub3QgaGFuZGxlZCBjb3JyZWN0bHkgYW5kIHdvdWxkIGV2 ZW50dWFsbHkgbGVhZCB0byBhIHJ1bnRpbWUgZmFpbHVyZS4NCj4NCj4gTm9ybWFsbHkgU21hdGNo IGlzIHNtYXJ0IGVub3VnaCB0byBrbm93IHRoYXQgdGhlIHBvaW50ZXIgaXNuJ3QgTlVMTCBzbw0K PiBpdCBkb2Vzbid0IGdlbmVyYXRlIGEgd2FybmluZyBidXQgeWVzdGVyZGF5IEkgaW50cm9kdWNl ZCBhIGJ1ZyBpbiBTbWF0Y2gNCj4gYnkgbWlzdGFrZS4gIEl0J3MgZml4ZWQgbm93Lg0KPg0KPiBy ZWdhcmRzLA0KPiBkYW4gY2FycGVudGVyDQo+DQpUaGFuayB5b3UsDQoNCkknbGwgaGF2ZSBhIGxv b2sgYXQgdGhvc2UNCg= 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=-0.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 56C9AC5518A for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 4/21/20 14:51, Dan Carpenter wrote: > It turns out there aren't that many of these in xen. > > $ grep IS_ERR_OR_NULL drivers/gpu/drm/xen/ -Rn > drivers/gpu/drm/xen/xen_drm_front_kms.c:63: if (IS_ERR_OR_NULL(fb)) > drivers/gpu/drm/xen/xen_drm_front_gem.c:86: if (IS_ERR_OR_NULL(xen_obj)) > drivers/gpu/drm/xen/xen_drm_front_gem.c:120: if (IS_ERR_OR_NULL(xen_obj->pages)) { > drivers/gpu/drm/xen/xen_drm_front_gem.c:139: if (IS_ERR_OR_NULL(xen_obj)) > drivers/gpu/drm/xen/xen_drm_front_gem.c:197: if (IS_ERR_OR_NULL(xen_obj)) > drivers/gpu/drm/xen/xen_drm_front.c:403: if (IS_ERR_OR_NULL(obj)) { > > They're all wrong, because if the pointer was really NULL then it's > not handled correctly and would eventually lead to a runtime failure. > > Normally Smatch is smart enough to know that the pointer isn't NULL so > it doesn't generate a warning but yesterday I introduced a bug in Smatch > by mistake. It's fixed now. > > regards, > dan carpenter > Thank you, I'll have a look at those _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel 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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 B0D3FC54FD0 for ; Tue, 21 Apr 2020 12:54:49 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 3D0BF2076C for ; 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