cmd->SCp.buffers_residual = cmd->use_sg - 1;
cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
cmd->SCp.this_residual = cmd->SCp.buffer->length;
cmd->SCp.buffers_residual = cmd->use_sg - 1;
cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
cmd->SCp.this_residual = cmd->SCp.buffer->length;