From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl1-f198.google.com (mail-pl1-f198.google.com [209.85.214.198]) by kanga.kvack.org (Postfix) with ESMTP id CD8E56B0289 for ; Tue, 9 Oct 2018 09:26:23 -0400 (EDT) Received: by mail-pl1-f198.google.com with SMTP id v7-v6so955442plo.23 for ; Tue, 09 Oct 2018 06:26:23 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org. [2607:7c80:54:e::133]) by mx.google.com with ESMTPS id p9-v6si14611530pfh.232.2018.10.09.06.26.22 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 09 Oct 2018 06:26:22 -0700 (PDT) From: Christoph Hellwig Subject: [PATCH 24/33] powerpc/dma: fix an off-by-one in dma_capable Date: Tue, 9 Oct 2018 15:24:51 +0200 Message-Id: <20181009132500.17643-25-hch@lst.de> In-Reply-To: <20181009132500.17643-1-hch@lst.de> References: <20181009132500.17643-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org We need to compare the last byte in the dma range and not the one after it for the bus_dma_mask, just like we do for the regular dma_mask. Fix this cleanly by merging the two comparisms into one. Signed-off-by: Christoph Hellwig --- arch/powerpc/include/asm/dma-direct.h | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/include/asm/dma-direct.h b/arch/powerpc/include/asm/dma-direct.h index e00ab5d0612d..92d8aed86422 100644 --- a/arch/powerpc/include/asm/dma-direct.h +++ b/arch/powerpc/include/asm/dma-direct.h @@ -4,15 +4,11 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) { -#ifdef CONFIG_SWIOTLB - if (dev->bus_dma_mask && addr + size > dev->bus_dma_mask) - return false; -#endif - if (!dev->dma_mask) return false; - return addr + size - 1 <= *dev->dma_mask; + return addr + size - 1 <= + min_not_zero(*dev->dma_mask, dev->bus_dma_mask); } static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) -- 2.19.0