[PATCH] staging: android: ion: Check for register_shrinker() failure.

[Tetsuo Handa]

register_shrinker() might return -ENOMEM error since Linux 3.12.
But since callers of ion_device_add_heap() are not ready to receive an
error and it is not simple enough to fix within this patch, this patch
just prints a warning line when register_shrinker() failed.

Signed-off-by: Tetsuo Handa <penguin-kernel at I-love.SAKURA.ne.jp>
Cc: John Stultz <john.stultz at linaro.org>
Cc: Greg Kroah-Hartman <gregkh at suse.de>
Cc: Michal Hocko <mhocko at suse.com>
---
 drivers/staging/android/ion/ion_heap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
index 91faa7f..56dcbd8 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -312,5 +312,6 @@ void ion_heap_init_shrinker(struct ion_heap *heap)
 	heap->shrinker.scan_objects = ion_heap_shrink_scan;
 	heap->shrinker.seeks = DEFAULT_SEEKS;
 	heap->shrinker.batch = 0;
-	register_shrinker(&heap->shrinker);
+	if (register_shrinker(&heap->shrinker))
+		pr_err("Failed to create heap shrinker for %s\n", heap->name);
 }
-- 
1.8.3.1