[PATCH] block: Restore tape support

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According to what I found in
https://bugzilla.kernel.org/show_bug.cgi?id=201935 patch "block: Clear
kernel memory before copying to user" broke tape access. Hence revert
that patch.

Reported-by: Todd Aiken <taiken@xxxxxxxxx>
Fixes: f3587d76da05 ("block: Clear kernel memory before copying to user") # v4.20-rc2
Cc: Todd Aiken <taiken@xxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Laurence Oberman <loberman@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 block/bio.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/block/bio.c b/block/bio.c
index 06760543ec81..90c32cd3e0c7 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1262,7 +1262,6 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 		if (ret)
 			goto cleanup;
 	} else {
-		zero_fill_bio(bio);
 		iov_iter_advance(iter, bio->bi_iter.bi_size);
 	}
 
-- 
2.19.2




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