tree a6d55bcb5428401bc0d0b93f250eee620a7d3185
parent 3684aa7099e0ab1038a1a1bf717ae60ffc3018d1
author Christoph Hellwig <hch@lst.de> 1457714090 +0100
committer Jens Axboe <axboe@fb.com> 1457967321 -0600

block: don't unecessarily clobber bi_error for chained bios

Only overwrite the parents bi_error if it was zero. That way a successful
bio completion doesn't reset the error pointer.

Reported-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>