ARM: dmabounce: fix map_single() error return value
Russell King [Sun, 3 Jul 2011 22:24:21 +0000 (23:24 +0100)]
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>

arch/arm/common/dmabounce.c

index e568163..841df7d 100644 (file)
@@ -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,