linux-kernel - [PATCH v5 8/8] of: limit dma_mask of the device based on dma-range size

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Date:	Tue, 27 Jan 2015 16:00:05 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	<devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>
CC:	Murali Karicheri <m-karicheri2@...com>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: [PATCH v5 8/8] of: limit dma_mask of the device based on dma-range size

limit the device dma_mask to the min of default dma_mask and
mask calculate from the dma-range size.

Cc: Joerg Roedel <joro@...tes.org>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Will Deacon <will.deacon@....com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 drivers/of/device.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 17504f4..bcb8a35 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -128,6 +128,9 @@ void of_dma_configure(struct device *dev, struct device_node *np)
 	dev_dbg(dev, "device is%sbehind an iommu\n",
 		iommu ? " " : " not ");
 
+	/* limit dma_mask to the lower of the two values */
+	*dev->dma_mask = min((*dev->dma_mask), (dma_addr + size - 1));
+
 	arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
 }
 EXPORT_SYMBOL_GPL(of_dma_configure);
-- 
1.7.9.5

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