linux-kernel - [PATCH 1/5] ccio: allow large DMA masks

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Message-Id: <20190215144559.8777-2-hch@lst.de>
Date:   Fri, 15 Feb 2019 15:45:55 +0100
From:   Christoph Hellwig <hch@....de>
To:     "David S. Miller" <davem@...emloft.net>,
        Helge Deller <deller@....de>
Cc:     Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, sparclinux@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] ccio: allow large DMA masks

There is no harm in setting a 64-bit mask even if we don't need it,
and the current ccio code is one of the few place in the kernel
still rejecting larger than required DMA masks.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/parisc/ccio-dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index 8d2fc84119c6..24a68fb7b2f9 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -710,8 +710,8 @@ ccio_dma_supported(struct device *dev, u64 mask)
 		return 0;
 	}
 
-	/* only support 32-bit devices (ie PCI/GSC) */
-	return (int)(mask == 0xffffffffUL);
+	/* only support 32-bit or better devices (ie PCI/GSC) */
+	return (int)(mask >= 0xffffffffUL);
 }
 
 /**
-- 
2.20.1