linux-kernel - [RFC PATCH 3/3] dma-mapping: clear dma

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Date:   Thu, 13 Sep 2018 17:17:16 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>
Cc:     linux-renesas-soc@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: [RFC PATCH 3/3] dma-mapping: clear dma_parms on teardown, too

While sanitizig the pointer for dma_ops on teardown, do the same for
dma_parms, too. Rename the function to have a more generic name.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 arch/arm/mm/dma-mapping.c   | 2 +-
 include/linux/dma-mapping.h | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 466b0242e8af..bcf77bc0423f 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -2399,5 +2399,5 @@ void arch_teardown_dma_ops(struct device *dev)
 	if (dev->archdata.dma_ops_setup)
 		arm_teardown_iommu_dma_ops(dev);
 
-	generic_teardown_dma_ops(dev);
+	generic_teardown_dma(dev);
 }
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 020512cb7f0e..6a2d8779b1d8 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -663,12 +663,13 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 				      bool coherent) { }
 #endif
 
-static inline void generic_teardown_dma_ops(struct device *dev)
+static inline void generic_teardown_dma(struct device *dev)
 {
 	dev->dma_ops = NULL;
+	dev->dma_parms = NULL;
 }
 #ifndef arch_teardown_dma_ops
-#define arch_teardown_dma_ops generic_teardown_dma_ops
+#define arch_teardown_dma_ops generic_teardown_dma
 #endif
 
 static inline unsigned int dma_get_max_seg_size(struct device *dev)
-- 
2.18.0