linux-kernel - [PATCH] dma-mapping: limit dma_mask in arch_setup_dma

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Date:	Wed, 24 Dec 2014 16:55:39 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	<linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <arnd@...db.de>,
	<will.deacon@....com>, <grant.likely@...aro.org>,
	<robh+dt@...nel.org>, <devicetree@...r.kernel.org>
CC:	Murali Karicheri <m-karicheri2@...com>
Subject: [PATCH] dma-mapping: limit dma_mask in arch_setup_dma_ops()

dma_mask should be limited to minimum of the default dma mask
and dma-range size configured in DT for proper operation.

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/mm/dma-mapping.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 7864797..5cea1fc 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -2053,6 +2053,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 {
 	struct dma_map_ops *dma_ops;
 
+	*dev->dma_mask = min((*dev->dma_mask), (dma_base + size - 1));
 	dev->archdata.dma_coherent = coherent;
 	if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu))
 		dma_ops = arm_get_iommu_dma_map_ops(coherent);
-- 
1.7.9.5

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