mm, CMA: clean-up CMA allocation error path

We can remove one call sites for clear_cma_bitmap() if we first call it
before checking error number.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Michal Nazarewicz <mina86@mina86.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Gleb Natapov <gleb@kernel.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/mm/cma.c b/mm/cma.c
index 656004216953..103a6663b7c7 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -285,11 +285,12 @@ struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
                 if (ret == 0) {
                         page = pfn_to_page(pfn);
                         break;
-                } else if (ret != -EBUSY) {
-                        cma_clear_bitmap(cma, pfn, count);
-                        break;
                 }
+
                 cma_clear_bitmap(cma, pfn, count);
+                if (ret != -EBUSY)
+                        break;
+
                 pr_debug("%s(): memory range at %p is busy, retrying\n",
                          __func__, pfn_to_page(pfn));
                 /* try again with a bit different memory target */