From: Tom Lendacky Subject: Re: [Linaro-acpi] [V2 PATCH 2/5] arm64 : Introduce support for ACPI _CCA object Date: Tue, 5 May 2015 11:24:03 -0500 Message-ID: <5548EEA3.8010101@amd.com> References: <1430838729-21572-1-git-send-email-Suravee.Suthikulpanit@amd.com> <5126612.k0u2CL2zi5@wuerfel> <5548EB42.5010800@amd.com> <8157862.NJP1L4Rh25@wuerfel> <5548EC47.3020501@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Cc: , , , , , , , , , , To: Suravee Suthikulanit , Arnd Bergmann , Return-path: Received: from mail-bn1bbn0104.outbound.protection.outlook.com ([157.56.111.104]:57504 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752828AbbEEQYQ (ORCPT ); Tue, 5 May 2015 12:24:16 -0400 In-Reply-To: <5548EC47.3020501@amd.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: On 05/05/2015 11:13 AM, Suravee Suthikulanit wrote: > On 5/5/2015 11:12 AM, Arnd Bergmann wrote: >> On Tuesday 05 May 2015 11:09:38 Suravee Suthikulanit wrote: >>> >>> However, codes in several places are making use of dma_map_ops without >>> checking if the ops are NULL (i.e. >>> include/asm-generic/dma-mapping-common.h and in arch-specific >>> implementation). If setting it to NULL is what we are planning to >>> support, we would need to scrub the current code to put NULL check. >>> Also, would you consider if that is safe to do going forward? >>> >>> >> >> I mean the dma_mask pointer, not dma_map_ops. Except a lot of drivers will actually set the dma_mask pointer during probe (usually by setting dev->dma_mask = &dev->coherent_dma_mask or by calling dma_coerce_mask_and_coherent). So I think the dummy_dma_ops might be the safest way to go. Thanks, Tom >> >> Arnd >> > > Ah, got it. Sorry for confusion. > > Suravee > > _______________________________________________ > Linaro-acpi mailing list > Linaro-acpi@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/linaro-acpi