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>

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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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drivers/pci/intr_remapping.c

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