static irqreturn_t dino_isr()

in dino.c [359:399]

• 29 lines of code
• 5 McCabe index (conditional complexity)

static irqreturn_t dino_isr(int irq, void *intr_dev)
{
	struct dino_device *dino_dev = intr_dev;
	u32 mask;
	int ilr_loop = 100;

	/* read and acknowledge pending interrupts */
#ifdef DINO_DEBUG
	dino_dev->dino_irr0 =
#endif
	mask = __raw_readl(dino_dev->hba.base_addr+DINO_IRR0) & DINO_IRR_MASK;

	if (mask == 0)
		return IRQ_NONE;

ilr_again:
	do {
		int local_irq = __ffs(mask);
		int irq = dino_dev->global_irq[local_irq];
		DBG(KERN_DEBUG "%s(%d, %p) mask 0x%x\n",
			__func__, irq, intr_dev, mask);
		generic_handle_irq(irq);
		mask &= ~DINO_MASK_IRQ(local_irq);
	} while (mask);

	/* Support for level triggered IRQ lines.
	** 
	** Dropping this support would make this routine *much* faster.
	** But since PCI requires level triggered IRQ line to share lines...
	** device drivers may assume lines are level triggered (and not
	** edge triggered like EISA/ISA can be).
	*/
	mask = __raw_readl(dino_dev->hba.base_addr+DINO_ILR) & dino_dev->imr;
	if (mask) {
		if (--ilr_loop > 0)
			goto ilr_again;
		pr_warn_ratelimited("Dino 0x%px: stuck interrupt %d\n",
		       dino_dev->hba.base_addr, mask);
	}
	return IRQ_HANDLED;
}