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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_NEOMUTT 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 E3724C43144 for ; Tue, 26 Jun 2018 13:46:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 92EE226B84 for ; Tue, 26 Jun 2018 13:46:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 92EE226B84 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=the-dreams.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935522AbeFZNqQ (ORCPT ); Tue, 26 Jun 2018 09:46:16 -0400 Received: from sauhun.de ([88.99.104.3]:52782 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933522AbeFZNqP (ORCPT ); Tue, 26 Jun 2018 09:46:15 -0400 Received: from localhost (unknown [82.202.112.231]) by pokefinder.org (Postfix) with ESMTPSA id D550256A485; Tue, 26 Jun 2018 15:46:12 +0200 (CEST) Date: Tue, 26 Jun 2018 17:46:07 +0400 From: Wolfram Sang To: Peter Rosin Cc: linux-kernel@vger.kernel.org, Vadim Pasternak , Michael Shych , Guenter Roeck , Akinobu Mita , Jean Delvare , linux-i2c@vger.kernel.org Subject: Re: [PATCH 1/5] i2c: smbus: add unlocked __i2c_smbus_xfer variant Message-ID: <20180626134606.h4ciolw23t6qnrjb@ninjato> References: <20180620085157.30121-1-peda@axentia.se> <20180620085157.30121-2-peda@axentia.se> <20180626023757.l54suaryim2fieq3@ninjato> <79E4A06C-26EF-4FF4-AFEA-7E7769FDF995@axentia.se> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="hauj3d2ynysbmlnz" Content-Disposition: inline In-Reply-To: <79E4A06C-26EF-4FF4-AFEA-7E7769FDF995@axentia.se> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --hauj3d2ynysbmlnz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > I don't think it's that easy as I just thought about another problem > with lifting the locking from the emulation function. It calls > kzalloc(..., GFP_KERNEL), at least in some cases, and that's not a > very good idea from atomic/irq context... Right. However, we could simply bail out early when we are in atomic context. Simply no DMA then... --hauj3d2ynysbmlnz Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAlsyQ54ACgkQFA3kzBSg KbbisxAAgJ1Hqsg7KSWJ8Nhdf/n/x4KMtajyVDYr6gcblvLd6vm4JNmmBscMtJve LfHaU1qFRJMMmEUQOzjNcLdC7q5ZnFWEz6YgX2yuoRp4VMw9RAFVmlM16zoZyMOA 0jKNfJ8nTudVonSBB/4nfGYUqGbKEqJqklaGhqu4Ga7SnF1JWgrWyAbXGEHiQSez Xzpm76VeDCyp2/WYP8V1Lw46zC5j5Zkh3PH7sStw2BMCIDOYK8ipXzU3rl8akdbi DM0FuB9CzY2MnTfhvhIM6RsNBeJo1KDMlzYG9WY2yTI4kQ/GcNO2lqFsSUTxsrKT sJ8vRiVhgY0KmBKBB3hsGCVvYt6meof1TaLHb2iUK2IYjc1XAlC26JM9hLSEg+X4 6qi3gr/xi8vU53Fgmjs3KkA6rUr+ivaXU4pkIy0WFTWwRpJQ4pBLzEzdQEQ7VE0J MPWQ1WWVMcI8FkCL+krUsaPdR1yhVZH7DNAj6xxfGu9QDdBGNLz/c8pd2ghk4CuP 2kIIjC1v4oIOx5kxFXoBe3NhtAWhYY7MrTJnUDKIUnVtj2Z+FZiQIcJisu8e7Zob 5LdQdcFa1qhBw8jRkgUlQhAsil4sycWQcwSoaV/CCxquP2Yc0LYCJ9nzThn24p2H V66XHFValUM+jOqxQkFg5SA7wXu9U+Omm6gZTObiJEza0LzFhpY= =cn0W -----END PGP SIGNATURE----- --hauj3d2ynysbmlnz--