x86: Fix interrupt leak due to migration
When we migrate an interrupt from one CPU to another, we set the move_in_progress flag and clean up the vectors later once they're not being used. If you're unlucky and call destroy_irq() before the vectors become un-used, the move_in_progress flag is never cleared, which causes the interrupt to become unusable. This was discovered by Jesse Brandeburg for whom it manifested as an MSI-X device refusing to use MSI-X mode when the driver was unloaded and reloaded repeatedly. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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23918b0306
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0ca4b6b001
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@ -1140,6 +1140,20 @@ static void __clear_irq_vector(int irq)
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cfg->vector = 0;
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cpus_clear(cfg->domain);
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if (likely(!cfg->move_in_progress))
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return;
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cpus_and(mask, cfg->old_domain, cpu_online_map);
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for_each_cpu_mask_nr(cpu, mask) {
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for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
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vector++) {
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if (per_cpu(vector_irq, cpu)[vector] != irq)
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continue;
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per_cpu(vector_irq, cpu)[vector] = -1;
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break;
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}
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}
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cfg->move_in_progress = 0;
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}
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void __setup_vector_irq(int cpu)
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