static void iosapic_unmask_irq()

in iosapic.c [616:657]

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

static void iosapic_unmask_irq(struct irq_data *d)
{
	struct vector_info *vi = irq_data_get_irq_chip_data(d);
	u32 d0, d1;

	/* data is initialized by fixup_irq */
	WARN_ON(vi->txn_irq  == 0);

	iosapic_set_irt_data(vi, &d0, &d1);
	iosapic_wr_irt_entry(vi, d0, d1);

#ifdef DEBUG_IOSAPIC_IRT
{
	u32 *t = (u32 *) ((ulong) vi->eoi_addr & ~0xffUL);
	printk("iosapic_enable_irq(): regs %p", vi->eoi_addr);
	for ( ; t < vi->eoi_addr; t++)
		printk(" %x", readl(t));
	printk("\n");
}

printk("iosapic_enable_irq(): sel ");
{
	struct iosapic_info *isp = vi->iosapic;

	for (d0=0x10; d0<0x1e; d0++) {
		d1 = iosapic_read(isp->addr, d0);
		printk(" %x", d1);
	}
}
printk("\n");
#endif

	/*
	 * Issuing I/O SAPIC an EOI causes an interrupt IFF IRQ line is
	 * asserted.  IRQ generally should not be asserted when a driver
	 * enables their IRQ. It can lead to "interesting" race conditions
	 * in the driver initialization sequence.
	 */
	DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", d->irq,
			vi->eoi_addr, vi->eoi_data);
	iosapic_eoi(vi->eoi_addr, vi->eoi_data);
}