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Stacking drivers may append bvecs to existing bio's, resulting in non-zero bi_idx conditions. This patch counts the loops of bio_for_each_segment() rather than inheriting the bi_idx value to pass as a segment count to the hardware submission routine. Signed-off-by: Sam Bradshaw <sbradshaw@micron.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>