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@gmail.com Signed-off-by: Marek Szyprowski m.szyprowski@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",