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

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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>
This commit is contained in:
Han, Weidong 2009-04-04 17:21:26 +08:00 committed by David Woodhouse
parent 161fde083f
commit 34aaaa948e
1 changed files with 7 additions and 0 deletions
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7
drivers/pci/intr_remapping.c
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@ -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.
*/