Hi Jens This patch set fixes two defects during update hw queues. 1st patch refactor the blk-mq debugfs and sysfs register during blk_mq_update_nr_hw_queues. 2nd patch should be able to fix the panic reported in follwing link https://marc.info/?l=linux-block&m=153799465603723&w=2 Jianchao Wang (2) blk-mq: adjust debugfs and sysfs register when updating nr_hw_queues blk-mq: fallback to previous nr_hw_queues when updating fails block/blk-mq.c | 79 ++++++++++++++++++++++++++++++++++------------------------ 1 file changed, 47 insertions(+), 32 deletions(-) Thanks Jianchao