D29310.id86854.diff
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D29310.id86854.diff
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	Index: sys/kern/subr_intr.c
	===================================================================
	--- sys/kern/subr_intr.c
	+++ sys/kern/subr_intr.c
	@@ -401,33 +401,25 @@
	static inline int
	isrc_alloc_irq(struct intr_irqsrc *isrc)
	{
	- u_int maxirqs, irq;
	+ u_int maxirqs;

	mtx_assert(&isrc_table_lock, MA_OWNED);

	maxirqs = intr_nirq;
	- if (irq_next_free >= maxirqs)
	- return (ENOSPC);

	- for (irq = irq_next_free; irq < maxirqs; irq++) {
	- if (irq_sources[irq] == NULL)
	- goto found;
	- }
	- for (irq = 0; irq < irq_next_free; irq++) {
	- if (irq_sources[irq] == NULL)
	+ while (irq_next_free < maxirqs) {
	+ if (irq_sources[irq_next_free] == NULL)
	goto found;
	+ ++irq_next_free;
	}

	- irq_next_free = maxirqs;
	return (ENOSPC);

	found:
	- isrc->isrc_irq = irq;
	- irq_sources[irq] = isrc;
	+ isrc->isrc_irq = irq_next_free;
	+ irq_sources[irq_next_free] = isrc;

	- irq_next_free = irq + 1;
	- if (irq_next_free >= maxirqs)
	- irq_next_free = 0;
	+ ++irq_next_free;
	return (0);
	}

	@@ -445,6 +437,10 @@
	if (irq_sources[isrc->isrc_irq] != isrc)
	return (EINVAL);

	+ /* Signal availability to isrc_alloc_irq(). */
	+ if (isrc->isrc_irq < irq_next_free)
	+ irq_next_free = isrc->isrc_irq;
	+
	irq_sources[isrc->isrc_irq] = NULL;
	isrc->isrc_irq = INTR_IRQ_INVALID; /* just to be safe */
	return (0);