static int configure_port_init()

in eisa_enumerator.c [209:272]

• 56 lines of code
• 10 McCabe index (conditional complexity)

static int configure_port_init(const unsigned char *buf)
{
	int len=0;
	u_int8_t c;
	
	while (len<HPEE_PORT_INIT_MAX_LEN) {
		int s=0;
		c = get_8(buf+len);
		
		switch (c & HPEE_PORT_INIT_WIDTH_MASK)  {
		 case HPEE_PORT_INIT_WIDTH_BYTE:
			s=1;
			if (c & HPEE_PORT_INIT_MASK) {
				printk(KERN_WARNING "port_init: unverified mask attribute\n");
				outb((inb(get_16(buf+len+1) & 
					  get_8(buf+len+3)) | 
				      get_8(buf+len+4)), get_16(buf+len+1));
				      
			} else {
				outb(get_8(buf+len+3), get_16(buf+len+1));
				      
			}
			break;
		 case HPEE_PORT_INIT_WIDTH_WORD:
			s=2;
			if (c & HPEE_PORT_INIT_MASK) {
 				printk(KERN_WARNING "port_init: unverified mask attribute\n");
				       outw((inw(get_16(buf+len+1)) &
					     get_16(buf+len+3)) |
					    get_16(buf+len+5), 
					    get_16(buf+len+1));
			} else {
				outw(cpu_to_le16(get_16(buf+len+3)), get_16(buf+len+1));
			}
			break;
		 case HPEE_PORT_INIT_WIDTH_DWORD:
			s=4;
			if (c & HPEE_PORT_INIT_MASK) {
 				printk(KERN_WARNING "port_init: unverified mask attribute\n");
				outl((inl(get_16(buf+len+1) &
					  get_32(buf+len+3)) |
				      get_32(buf+len+7)), get_16(buf+len+1));
			} else {
				outl(cpu_to_le32(get_32(buf+len+3)), get_16(buf+len+1));
			}

			break;
		 default:
			printk(KERN_ERR "Invalid port init word %02x\n", c);
			return 0;
		}
		
		if (c & HPEE_PORT_INIT_MASK) {   
			s*=2;
		}
		
		len+=s+3;
		if (!(c & HPEE_PORT_INIT_MORE)) {
			break;
		}
	}
	
	return len;
}