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@mvtech.ca Fixes: f3587d76da05 ("block: Clear kernel memory before copying to user") # v4.20-rc2 Cc: Todd Aiken taiken@mvtech.ca Cc: Keith Busch keith.busch@intel.com Cc: Laurence Oberman loberman@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Bart Van Assche bvanassche@acm.org --- 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); }