Commit 34aaaa94 authored by Han, Weidong's avatar Han, Weidong Committed by David Woodhouse

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: default avatarWeidong Han <weidong.han@intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 161fde08
...@@ -523,6 +523,13 @@ int __init enable_intr_remapping(int eim) ...@@ -523,6 +523,13 @@ int __init enable_intr_remapping(int eim)
for_each_drhd_unit(drhd) { for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu; struct intel_iommu *iommu = drhd->iommu;
/*
* If the queued invalidation is already initialized,
* shouldn't disable it.
*/
if (iommu->qi)
continue;
/* /*
* Clear previous faults. * Clear previous faults.
*/ */
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment