mm/cma.c: check the max limit for cma allocation

[linux-2.6-microblaze.git] / mm / cma.c

diff --git a/mm/cma.c b/mm/cma.c
index 384c2cb..c960459 100644 (file)
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -385,6 +385,9 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align)
        bitmap_maxno = cma_bitmap_maxno(cma);
        bitmap_count = cma_bitmap_pages_to_bits(cma, count);
 
+       if (bitmap_count > bitmap_maxno)
+               return NULL;
+
        for (;;) {
                mutex_lock(&cma->lock);
                bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap,