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Commit c1d99334 authored by Feng Wu's avatar Feng Wu Committed by Thomas Gleixner
Browse files

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: default avatarFeng Wu <feng.wu@intel.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarJoerg 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: default avatarThomas Gleixner <tglx@linutronix.de>
parent 959c870f

drivers/iommu/intel_irq_remapping.c

+3 −0
Original line number Diff line number Diff line
@@ -1355,6 +1355,9 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert) 
		return -EINVAL;

	if (!ecap_ir_support(iommu->ecap))

		return 0;

	if (irq_remapping_cap(IRQ_POSTING_CAP) &&

	    !cap_pi_support(iommu->cap))

		return -EBUSY;



	if (insert) {

		if (!iommu->ir_table)