[PATCHv6 01/11] block: fix infinite loop for invalid zone append

[Keith Busch]

From: Keith Busch <kbusch at kernel.org>

Returning 0 early from __bio_iov_append_get_pages() for the
max_append_sectors warning just creates an infinite loop since 0 means
success, and the bio will never fill from the unadvancing iov_iter. We
could turn the return into an error value, but it will already be turned
into an error value later on, so just remove the warning. Clearly no one
ever hit it anyway.

Fixes: 0512a75b98f84 ("block: Introduce REQ_OP_ZONE_APPEND")
Signed-off-by: Keith Busch <kbusch at kernel.org>
Reviewed-by: Damien Le Moal <damien.lemoal at opensource.wdc.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn at wdc.com>
---
 block/bio.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index f92d0223247b..d481d5e4fe47 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1229,9 +1229,6 @@ static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter)
 	size_t offset;
 	int ret = 0;
 
-	if (WARN_ON_ONCE(!max_append_sectors))
-		return 0;
-
 	/*
 	 * Move page array up in the allocated memory for the bio vecs as far as
 	 * possible so that we can start filling biovecs from the beginning
-- 
2.30.2