NVME_CC_SHN_MASK
fdev->cc_reg &= ~(NVME_CC_SHN_MASK | NVME_CC_ENABLE);
ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
return (cc & NVME_CC_SHN_MASK) >> NVME_CC_SHN_SHIFT;
cfg &= ~(NVME_CC_SHN_MASK | NVME_CC_ENABLE);