read_csr_ring_tail
u32 (*read_csr_ring_tail)(void __iomem *csr_base_addr, u32 bank,
state->rings[i].tail = ops->read_csr_ring_tail(base, bank, i);
csr_ops->read_csr_ring_tail = read_csr_ring_tail;
csr_ops->read_csr_ring_tail = read_csr_ring_tail;
tail = csr_ops->read_csr_ring_tail(csr, bank->bank_number,
tail = csr_ops->read_csr_ring_tail(csr, bank->bank_number,