From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Sun, 3 Jul 2011 22:24:21 +0000 (+0100)
Subject: ARM: dmabounce: fix map_single() error return value
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=178783622ce0fd629fad21b33b8f8f56b64c5e45;p=deliverable%2Flinux.git

ARM: dmabounce: fix map_single() error return value

When map_single() is unable to obtain a safe buffer, we must return
the dma_addr_t error value, which is ~0 rather than 0.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index e5681636626f..841df7d21c2f 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -255,7 +255,7 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
 		if (buf == 0) {
 			dev_err(dev, "%s: unable to map unsafe buffer %p!\n",
 			       __func__, ptr);
-			return 0;
+			return ~0;
 		}
 
 		dev_dbg(dev,