From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Subject: [PATCH] dma-direct: Fix return value of dma_direct_supported Date: Wed, 03 Oct 2018 16:48:07 -0700 Message-ID: <20181003234746.3586.42014.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: iommu@lists.linux-foundation.org Cc: benh@kernel.crashing.org, robin.murphy@arm.com, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, linuxppc-dev@lists.ozlabs.org, linux@roeck-us.net List-Id: iommu@lists.linux-foundation.org It appears that in commit 9d7a224b463e ("dma-direct: always allow dma mask <= physiscal memory size") the logic of the test was changed from a "<" to a ">=" however I don't see any reason for that change. I am assuming that there was some additional change planned, specifically I suspect the logic was intended to be reversed and possibly used for a return. Since that is the case I have gone ahead and done that. This addresses issues I had on my system that prevented me from booting with the above mentioned commit applied on an x86_64 system w/ Intel IOMMU. Fixes: 9d7a224b463e ("dma-direct: always allow dma mask <= physiscal memory size") Signed-off-by: Alexander Duyck --- kernel/dma/direct.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 5a0806b5351b..65872f6c2e93 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -301,9 +301,7 @@ int dma_direct_supported(struct device *dev, u64 mask) min_mask = min_t(u64, min_mask, (max_pfn - 1) << PAGE_SHIFT); - if (mask >= phys_to_dma(dev, min_mask)) - return 0; - return 1; + return mask >= phys_to_dma(dev, min_mask); } int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)