[PATCH 1/2] ARM: Fix off by one in checking DMA zone size

[Florian Fainelli]

The maximum DMA address is PAGE_OFFSET + arm_dma_zone_size - 1, fix this
by doing the appropriate subtraction.

Fixes: 650320181a08 ("ARM: change ARM_DMA_ZONE_SIZE into a variable")
Suggested-by: Geert Uytterhoeven <geert at linux-m68k.org>
Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 arch/arm/include/asm/dma.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/dma.h b/arch/arm/include/asm/dma.h
index a81dda65c576..f244ee68e814 100644
--- a/arch/arm/include/asm/dma.h
+++ b/arch/arm/include/asm/dma.h
@@ -11,7 +11,7 @@
 #define MAX_DMA_ADDRESS	({ \
 	extern phys_addr_t arm_dma_zone_size; \
 	arm_dma_zone_size && arm_dma_zone_size < (0x10000000 - PAGE_OFFSET) ? \
-		(PAGE_OFFSET + arm_dma_zone_size) : 0xffffffffUL; })
+		(PAGE_OFFSET + arm_dma_zone_size - 1) : 0xffffffffUL; })
 #endif
 
 #ifdef CONFIG_ISA_DMA_API
-- 
2.25.1