asmlinkage irqreturn_t floppy_hardint()

in include/asm/floppy.h [183:253]

• 62 lines of code
• 9 McCabe index (conditional complexity)

asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id)
{
	register unsigned char st;

#undef TRACE_FLPY_INT
#define NO_FLOPPY_ASSEMBLER

#ifdef TRACE_FLPY_INT
	static int calls=0;
	static int bytes=0;
	static int dma_wait=0;
#endif
	if(!doing_pdma) {
		floppy_interrupt(irq, dev_id);
		return IRQ_HANDLED;
	}

#ifdef TRACE_FLPY_INT
	if(!calls)
		bytes = virtual_dma_count;
#endif

	{
		register int lcount;
		register char *lptr;

		/* serve 1st byte fast: */

		st=1;
		for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
		    lcount; lcount--, lptr++) {
			st = inb(virtual_dma_port + FD_STATUS);
			st &= STATUS_DMA | STATUS_READY;
			if (st != (STATUS_DMA | STATUS_READY))
				break;
			if(virtual_dma_mode)
				outb_p(*lptr, virtual_dma_port + FD_DATA);
			else
				*lptr = inb_p(virtual_dma_port + FD_DATA);
		}

		virtual_dma_count = lcount;
		virtual_dma_addr = lptr;
		st = inb(virtual_dma_port + FD_STATUS);
	}

#ifdef TRACE_FLPY_INT
	calls++;
#endif
	if (st == STATUS_DMA)
		return IRQ_HANDLED;
	if (!(st & STATUS_DMA)) {
		virtual_dma_residue += virtual_dma_count;
		virtual_dma_count=0;
#ifdef TRACE_FLPY_INT
		pr_info("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
			virtual_dma_count, virtual_dma_residue, calls, bytes,
			dma_wait);
		calls = 0;
		dma_wait=0;
#endif
		doing_pdma = 0;
		floppy_interrupt(irq, dev_id);
		return IRQ_HANDLED;
	}
#ifdef TRACE_FLPY_INT
	if(!virtual_dma_count)
		dma_wait++;
#endif
	return IRQ_HANDLED;
}