[PATCH] drivers: cma: don't fail if migration returns -EAGAIN

[Marek Szyprowski]

alloc_contig_range() function might return -EAGAIN if migrate_pages() call
fails for some temporarily locked pages. Such case should not be fatal
to dma_alloc_from_contiguous(), which should retry allocation like in case
of -EBUSY error.

Reported-by: Haojian Zhuang <haojian.zhuang at gmail.com>
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 drivers/base/dma-contiguous.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 78efb03..e46e2fb 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -346,7 +346,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
 		if (ret == 0) {
 			bitmap_set(cma->bitmap, pageno, count);
 			break;
-		} else if (ret != -EBUSY) {
+		} else if (ret != -EBUSY && ret != -EAGAIN) {
 			goto error;
 		}
 		pr_debug("%s(): memory range at %p is busy, retrying\n",
-- 
1.7.1.569.g6f426