[RFC] ion:change ion_cma_allocate return error value

["Wang, Yalin" <Yalin.Wang@sonymobile.com>]

This patch change the error return value from -1 to -ENOMEM,
so that userspace can get the correct errno, otherwise,
-1 will be -EPERM, userspace will print permission deny for allocation
failure.

Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
---
 drivers/staging/android/ion/ion_cma_heap.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/android/ion/ion_cma_heap.c b/drivers/staging/android/ion/ion_cma_heap.c
index f4211f1..55bcaec2 100644
--- a/drivers/staging/android/ion/ion_cma_heap.c
+++ b/drivers/staging/android/ion/ion_cma_heap.c
@@ -24,8 +24,6 @@
 #include "ion.h"
 #include "ion_priv.h"
 
-#define ION_CMA_ALLOCATE_FAILED -1
-
 struct ion_cma_heap {
 	struct ion_heap heap;
 	struct device *dev;
@@ -59,7 +57,7 @@ static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
 
 	info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
 	if (!info)
-		return ION_CMA_ALLOCATE_FAILED;
+		return -ENOMEM;
 
 	info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle),
 						GFP_HIGHUSER | __GFP_ZERO);
@@ -87,7 +85,7 @@ free_mem:
 	dma_free_coherent(dev, len, info->cpu_addr, info->handle);
 err:
 	kfree(info);
-	return ION_CMA_ALLOCATE_FAILED;
+	return -ENOMEM;
 }
 
 static void ion_cma_free(struct ion_buffer *buffer)
-- 
2.2.2