Commit 34aaaa94 authored Apr 04, 2009 by Han, Weidong Committed by David Woodhouse Apr 04, 2009

x86, dmar: check if it's initialized before disable queue invalidation



If queue invalidation is disabled after it's already initialized,
dmar_enable_qi won't re-enable it due to iommu->qi is allocated.
It may result in system hang when use queue invalidation. Add this
check to avoid this case.

Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

parent 161fde08

drivers/pci/intr_remapping.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -523,6 +523,13 @@ int __init enable_intr_remapping(int eim)
		for_each_drhd_unit(drhd) {
		struct intel_iommu *iommu = drhd->iommu;

		/*
		* If the queued invalidation is already initialized,
		* shouldn't disable it.
		*/
		if (iommu->qi)
		continue;

		/*
		* Clear previous faults.
		*/