[PATCH AUTOSEL for 4.4 021/167] blk-mq: NVMe 512B/4K+T10 DIF/DIX format returns I/O error on dd with split op

From: Wen Xiong [ Upstream commit f36ea50ca0043e7b1204feaf1d2ba6bd68c08d36 ] When formatting NVMe to 512B/4K + T10 DIf/DIX, dd with split op returns "Input/output error". Looks block layer split the bio after calling bio_integrity_prep(bio). This patch fixes the

[PATCH AUTOSEL for 4.4 021/167] blk-mq: NVMe 512B/4K+T10 DIF/DIX format returns I/O error on dd with split op

From: Wen Xiong [ Upstream commit f36ea50ca0043e7b1204feaf1d2ba6bd68c08d36 ] When formatting NVMe to 512B/4K + T10 DIf/DIX, dd with split op returns "Input/output error". Looks block layer split the bio after calling bio_integrity_prep(bio). This patch fixes the issue. Below is how we debug