[PATCH v2 04/12] block: prohibit calls to bio_chain_endio

[zhangshida]

From: Shida Zhang <zhangshida at kylinos.cn>

Now that all potential callers of bio_chain_endio have been
eliminated, completely prohibit any future calls to this function.

Suggested-by: Ming Lei <ming.lei at redhat.com>
Suggested-by: Andreas Gruenbacher <agruenba at redhat.com>
Suggested-by: Christoph Hellwig <hch at infradead.org>
Signed-off-by: Shida Zhang <zhangshida at kylinos.cn>
---
 block/bio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/bio.c b/block/bio.c
index aa43435c15f..2473a2c0d2f 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -323,8 +323,13 @@ static struct bio *__bio_chain_endio(struct bio *bio)
 	return parent;
 }
 
+/**
+ * This function should only be used as a flag and must never be called.
+ * If execution reaches here, it indicates a serious programming error.
+ */
 static void bio_chain_endio(struct bio *bio)
 {
+	BUG_ON(1);
 	bio_endio(bio);
 }
 
-- 
2.34.1