From 1124d6d21f80ec10cc962e2961c21a8dd1e0ca6a Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 20 Oct 2008 11:18:40 +0100 Subject: [PATCH] [ARM] dma: correct dma_supported() implementation dma_supported() is supposed to indicate whether the system can support the DMA mask it was passed, which depends on the maximal address which can be returned for DMA allocations. If the mask is smaller than that, we are unable to guarantee that the driver can reliably obtain suitable memory. Signed-off-by: Russell King --- arch/arm/include/asm/dma-mapping.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 4ed149cbb32a..22cb14ec3438 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -69,7 +69,9 @@ extern void dma_cache_maint(const void *kaddr, size_t size, int rw); */ static inline int dma_supported(struct device *dev, u64 mask) { - return dev->dma_mask && *dev->dma_mask != 0; + if (mask < ISA_DMA_THRESHOLD) + return 0; + return 1; } static inline int dma_set_mask(struct device *dev, u64 dma_mask)