[PATCH] staging: android: check the return value of register_shrinker

[Xiongwei Song]

register_shrinker call is made in ashmem_init, it may return error code,
so we need to check it.

Signed-off-by: Xiongwei Song <sxwjean@xxxxxxxxx>
---
 drivers/staging/android/ashmem.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 4e8947923904..0b23c3e25cd4 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -854,12 +854,18 @@ static int __init ashmem_init(void)
 		goto out_free2;
 	}
 
-	register_shrinker(&ashmem_shrinker);
+	ret = register_shrinker(&ashmem_shrinker);
+	if (unlikely(ret)) {
+		pr_err("failed to register shrinker!\n");
+		goto out_demisc;
+	}
 
 	pr_info("initialized\n");
 
 	return 0;
 
+out_demisc:
+	misc_deregister(&ashmem_misc);
 out_free2:
 	kmem_cache_destroy(ashmem_range_cachep);
 out_free1:
-- 
2.15.1