代码拉取完成，页面将自动刷新
last_cmsn应该是last_pmsn，只是写错了字符，不影响编译和运行结果。
c: means consumer
p: means producer
drivers/scsi/spfc/hw/spfc_queue.h: u16 last_cmsn;
drivers/scsi/spfc/hw/spfc_queue.c: sq_ctrl->last_cmsn = 0;
drivers/scsi/spfc/hw/spfc_queue.c: pmsn = sq->last_cmsn;
drivers/scsi/spfc/hw/spfc_queue.c: pmsn = sq->last_cmsn;
drivers/scsi/spfc/hw/spfc_queue.c: ssq->last_cmsn,
drivers/scsi/spfc/hw/spfc_queue.c: link_wqe_msn = SPFC_MSN_DEC(ssq->last_cmsn);
drivers/scsi/spfc/hw/spfc_queue.c: spfc_build_wqe_owner_pmsn(io_sqe, (ssq->last_pi_owner), ssq->last_cmsn);
drivers/scsi/spfc/hw/spfc_queue.c: (u32)(ssq->last_cmsn >> UNF_SHIFT_12) & SPFC_DB_WD0_PI_H_MASK;
drivers/scsi/spfc/hw/spfc_queue.c: dre_door_bell.wd1.pi_lo = (u32)(ssq->last_cmsn & SPFC_DB_WD0_PI_L_MASK);
drivers/scsi/spfc/hw/spfc_queue.c: ssq->last_cmsn, SPFC_GET_QUEUE_CMSN(ssq));
drivers/scsi/spfc/hw/spfc_queue.c: ssq->last_cmsn = SPFC_MSN_INC(ssq->last_cmsn);
drivers/scsi/spfc/hw/spfc_queue.c: ssq->last_cmsn,
drivers/scsi/spfc/hw/spfc_queue.c: link_wqe_msn = SPFC_MSN_DEC(ssq->last_cmsn);
drivers/scsi/spfc/hw/spfc_queue.c: spfc_build_wqe_owner_pmsn(io_sqe, !(ssq->last_pi_owner), ssq->last_cmsn);
drivers/scsi/spfc/hw/spfc_queue.c: ssq->last_cmsn = SPFC_MSN_INC(ssq->last_cmsn);
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