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iommu, x86: Properly handle posted interrupts for IOMMU hotplug
Return error when inserting a new IOMMU which doesn't support posted interrupts if posted interrupts are already enabled. Signed-off-by: Feng Wu <feng.wu@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Joerg Roedel <joro@8bytes.org> Cc: jiang.liu@linux.intel.com Cc: iommu@lists.linux-foundation.org Cc: dwmw2@infradead.org Link: http://lkml.kernel.org/r/1433827237-3382-11-git-send-email-feng.wu@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -1355,6 +1355,9 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
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return -EINVAL;
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if (!ecap_ir_support(iommu->ecap))
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return 0;
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if (irq_remapping_cap(IRQ_POSTING_CAP) &&
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!cap_pi_support(iommu->cap))
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return -EBUSY;
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if (insert) {
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if (!iommu->ir_table)
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