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=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 1B7F8C433FF for ; Sun, 11 Aug 2019 08:05:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E61F62173C for ; Sun, 11 Aug 2019 08:05:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="T46e9N54" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726512AbfHKIF4 (ORCPT ); Sun, 11 Aug 2019 04:05:56 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:33280 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725810AbfHKIFy (ORCPT ); Sun, 11 Aug 2019 04:05:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=SRihJ2JCOubb4xOLvkiaXfqbtokLoWesn+Hfy8/Vu0Q=; b=T46e9N54SMpr4GBv9pEwtOISh 8/dhFXd16JGfmcLf2eLpHpf42sr2Bl89BbcsVn78EvBYavRPWjJnCCfr61VUbbd7pC0bJSI3dXBiK RNwWWO7xpA1SustKupCRocJIOMXxD4ifjurw05OKz/wk9fvh+CB6DwzdKjAPt0wss6bImBTMAZwgw iGT4dCCWVxHYAwsvPKv7gMFJ4ba6oyPfmBeNFsECPn7X2j9bXyRWwTuXJblluWLjH2gc3ZRQZHmFa bRegtSVX/8coTJsg53ce9JsZyT0FA5FzCeKMKV/4665rURUx3jNb9GTGLf+uOIZEcgX74HKJ1M1Uf voPPGPSSA==; Received: from [2001:4bb8:180:1ec3:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hwir0-0001uh-74; Sun, 11 Aug 2019 08:05:27 +0000 From: Christoph Hellwig To: Greg Kroah-Hartman , Maxime Chevallier Cc: Gavin Li , Laurentiu Tudor , Minas Harutyunyan , Alan Stern , Geoff Levand , Michal Simek , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Olav Kongas , Tony Prisk , Mathias Nyman , Bin Liu , linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: next take at setting up a dma mask by default for platform devices Date: Sun, 11 Aug 2019 10:05:14 +0200 Message-Id: <20190811080520.21712-1-hch@lst.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, this is another attempt to make sure the dma_mask pointer is always initialized for platform devices. Not doing so lead to lots of boilerplate code, and makes platform devices different from all our major busses like PCI where we always set up a dma_mask. In the long run this should also help to eventually make dma_mask a scalar value instead of a pointer and remove even more cruft. The bigger blocker for this last time was the fact that the usb subsystem uses the presence or lack of a dma_mask to check if the core should do dma mapping for the driver, which is highly unusual. So we fix this first. Note that this has some overlap with the pending desire to use the proper dma_mmap_coherent helper for mapping usb buffers. The first two patches from this series should probably go into 5.3 and then uses as the basis for the decision to use dma_mmap_coherent.