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From: Christoph Hellwig <hch@lst.de>
To: "Pawel Osciak" <pawel@osciak.com>,
	"Marek Szyprowski" <m.szyprowski@samsung.com>,
	"Kyungmin Park" <kyungmin.park@samsung.com>,
	"Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>
Cc: Robin Murphy <robin.murphy@arm.com>,
	Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linuxppc-dev@lists.ozlabs.org,
	linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org
Subject: [PATCH 2/3] dma-mapping: don't BUG when calling dma_map_resource on RAM
Date: Fri, 18 Jan 2019 12:37:26 +0100
Message-ID: <20190118113727.3270-3-hch@lst.de> (raw)
In-Reply-To: <20190118113727.3270-1-hch@lst.de>

Use WARN_ON_ONCE to print a stack trace and return a proper error
code instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
 include/linux/dma-mapping.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 9842085e6774..b904d55247ab 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -353,7 +353,8 @@ static inline dma_addr_t dma_map_resource(struct device *dev,
 	BUG_ON(!valid_dma_direction(dir));
 
 	/* Don't allow RAM to be mapped */
-	BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
+	if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
+		return DMA_MAPPING_ERROR;
 
 	if (dma_is_direct(ops))
 		addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
-- 
2.20.1


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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190118113751epcas2p2d7d678dcf247806a119316aabb4dde21@epcas2p2.samsung.com>
2019-01-18 11:37 ` fix a layering violation in videobuf2 and improve dma_map_resource v2 Christoph Hellwig
2019-01-18 11:37   ` [PATCH 1/3] dma-mapping: remove the default map_resource implementation Christoph Hellwig
2019-01-18 11:37   ` Christoph Hellwig [this message]
2019-01-18 11:37   ` [PATCH 3/3] videobuf2: replace a layering violation with dma_map_resource Christoph Hellwig
2019-02-01  7:05   ` fix a layering violation in videobuf2 and improve dma_map_resource v2 Marek Szyprowski
2019-02-01  9:07     ` Christoph Hellwig
2019-01-11 18:17 fix a layering violation in videobuf2 and improve dma_map_resource Christoph Hellwig
2019-01-11 18:17 ` [PATCH 2/3] dma-mapping: don't BUG when calling dma_map_resource on RAM Christoph Hellwig
2019-01-14 14:16   ` Robin Murphy

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