From patchwork Tue Mar 8 12:46:03 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Cohen X-Patchwork-Id: 618171 X-Patchwork-Delegate: tony@atomide.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p28CkIE7012442 for ; Tue, 8 Mar 2011 12:46:24 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754241Ab1CHMqW (ORCPT ); Tue, 8 Mar 2011 07:46:22 -0500 Received: from mail-ew0-f46.google.com ([209.85.215.46]:39130 "EHLO mail-ew0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752893Ab1CHMqU (ORCPT ); Tue, 8 Mar 2011 07:46:20 -0500 Received: by ewy6 with SMTP id 6so1963462ewy.19 for ; Tue, 08 Mar 2011 04:46:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:from:to:cc:subject:date:message-id:x-mailer :in-reply-to:references; bh=7q7eOQacs4BOza+k5IaVteuaxXPr6twpqGF+erQdG5Y=; b=CFwtlA1WMGb1fzRXrGD8iHlCG/eIDqgPgkr/jHQialIuP1rZVRyJnbYVEgSkhASd5L 08WcCUcFi4Cp9q6fr8NfNgybIAi8+T9LcS3YgWSMT+dd6xUH2v80mSppWrUs4NK74y+e Lp8z3RVp2CDZzgAgD3bWNlCMo/ZoF2Ggho8xQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=TFg0l5065lZtQMlrK6yNyFNdx6aksLxN9ONoZVPBeYBowh22U4nBLMS6iG2OwUnFxx 606dRUrJ2Dns/oBOwPLNkZSvF/AtHEdQqLXt7Q3F6KAH8ZGoW5VtuHHyJxEo00mSW43J YMgxPDkKCqdCVoF8b0E5fgO4E5SGgY8l1MuvU= Received: by 10.213.36.4 with SMTP id r4mr3581758ebd.66.1299588375948; Tue, 08 Mar 2011 04:46:15 -0800 (PST) Received: from localhost.localdomain (a91-152-72-10.elisa-laajakaista.fi [91.152.72.10]) by mx.google.com with ESMTPS id x54sm609369eeh.11.2011.03.08.04.46.14 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 08 Mar 2011 04:46:14 -0800 (PST) From: David Cohen To: Hiroshi.DOYU@nokia.com Cc: linux-omap@vger.kernel.org, fernando.lugo@ti.com, linux-media@vger.kernel.org, laurent.pinchart@ideasonboard.com, sakari.ailus@maxwell.research.nokia.com, Michael Jones Subject: [PATCH 1/3] omap: iovmm: disallow mapping NULL address Date: Tue, 8 Mar 2011 14:46:03 +0200 Message-Id: <1299588365-2749-2-git-send-email-dacohen@gmail.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1299588365-2749-1-git-send-email-dacohen@gmail.com> References: <1299588365-2749-1-git-send-email-dacohen@gmail.com> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Tue, 08 Mar 2011 12:46:24 +0000 (UTC) diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c index 6dc1296..11c9b76 100644 --- a/arch/arm/plat-omap/iovmm.c +++ b/arch/arm/plat-omap/iovmm.c @@ -271,20 +271,24 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, size_t bytes, u32 flags) { struct iovm_struct *new, *tmp; - u32 start, prev_end, alignement; + u32 start, prev_end, alignment; if (!obj || !bytes) return ERR_PTR(-EINVAL); start = da; - alignement = PAGE_SIZE; + alignment = PAGE_SIZE; if (flags & IOVMF_DA_ANON) { - start = obj->da_start; + /* Don't map address 0 */ + if (obj->da_start) + start = obj->da_start; + else + start = obj->da_start + alignment; if (flags & IOVMF_LINEAR) - alignement = iopgsz_max(bytes); - start = roundup(start, alignement); + alignment = iopgsz_max(bytes); + start = roundup(start, alignment); } else if (start < obj->da_start || start > obj->da_end || obj->da_end - start < bytes) { return ERR_PTR(-EINVAL); @@ -304,7 +308,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, goto found; if (tmp->da_end >= start && flags & IOVMF_DA_ANON) - start = roundup(tmp->da_end + 1, alignement); + start = roundup(tmp->da_end + 1, alignment); prev_end = tmp->da_end; }