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Index: sys/kern/subr_intr.c
===================================================================
--- sys/kern/subr_intr.c
+++ sys/kern/subr_intr.c
@@ -445,6 +445,10 @@
if (irq_sources[isrc->isrc_irq] != isrc)
return (EINVAL);
+ /* signal availability to isrc_alloc_irq(), if needed */
+ if (irq_next_free >= maxirqs)
+ irq_next_free = isrc->isrc_irq;
+
irq_sources[isrc->isrc_irq] = NULL;
isrc->isrc_irq = INTR_IRQ_INVALID; /* just to be safe */
return (0);

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