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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48FD0C433F5 for ; Mon, 28 Mar 2022 09:57:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240103AbiC1J71 (ORCPT ); Mon, 28 Mar 2022 05:59:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236910AbiC1J7Y (ORCPT ); Mon, 28 Mar 2022 05:59:24 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99EF653B40; Mon, 28 Mar 2022 02:57:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: Content-Type:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=zDjy6QdYMZfzrDBM8z3vmKyXyiyg4NDUsUB16DZQfq4=; t=1648461464; x=1649671064; b=UH6b4NIvopRVAzMa3bCp21YnfgYRvz2wKKPlyNtOm/5l7Bx zidQmCp78kWhq94JmnVBI4Sjp6hftur7hpIxHYsyfot3b240KdM+iIJnJR2yfvzumMWj4tTQT551K tT7Uxyzq/GxMKif6riOAe9s1pJV1ZEL0hLA4ewpRwWP8x99T1GPTK4JEpw+KB5FbRAv/XT4BR+Eh0 sQlsS4TIoJ+FIo35KVxww8Ur2b4T4XSOxFbk+T2DirF2EPh7w4DQUfgMUivjYUd8Z/ULRi8ykQCkN uY/+VEnymDcNX6av1ziQYFxMIZ2NmjBYbQWUhRpx586dwvvL0sb2pTaKWWw4KwKA==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.95) (envelope-from ) id 1nYm7v-001X9R-7G; Mon, 28 Mar 2022 11:57:31 +0200 Message-ID: Subject: Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break ath9k-based AP From: Johannes Berg To: Halil Pasic Cc: Linus Torvalds , Maxime Bizon , Toke =?ISO-8859-1?Q?H=F8iland-J=F8rgensen?= , Robin Murphy , Christoph Hellwig , Oleksandr Natalenko , Marek Szyprowski , Kalle Valo , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Olha Cherevyk , iommu , linux-wireless , Netdev , Linux Kernel Mailing List , Greg Kroah-Hartman , stable Date: Mon, 28 Mar 2022 11:57:30 +0200 In-Reply-To: References: <1812355.tdWV9SEqCh@natalenko.name> <20220324055732.GB12078@lst.de> <4386660.LvFx2qVVIh@natalenko.name> <81ffc753-72aa-6327-b87b-3f11915f2549@arm.com> <878rsza0ih.fsf@toke.dk> <4be26f5d8725cdb016c6fdd9d05cfeb69cdd9e09.camel@freebox.fr> <20220324163132.GB26098@lst.de> <871qyr9t4e.fsf@toke.dk> <31434708dcad126a8334c99ee056dcce93e507f1.camel@freebox.fr> <298f4f9ccad7c3308d3a1fd8b4b4740571305204.camel@sipsolutions.net> <20220327051502.63fde20a.pasic@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 (3.42.4-1.fc35) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-malware-bazaar: not-scanned Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2022-03-28 at 11:50 +0200, Johannes Berg wrote: > No I worded that badly - the direction isn't useless, but thinking of it > in terms of a buffer property rather than data movement is inaccurate. > So then if we need something else to indicate how data was expected to > be moved, the direction argument becomes useless, since it's not a > buffer property but rather a temporal thing on a specific place that > expected certain data movement. > Yeah, umm. I should've read the whole thread of the weekend first, sorry for the noise. johannes