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iommu/vt-d: Don't disable IR when it was previously enabled 

Keep it enabled in kdump kernel to guarantee interrupt
delivery.

Tested-by: ZhenHua Li <zhen-hual@hp.com>
Tested-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-06-12 15:15:34 +02:00
parent 7c3c9876d9
commit 571dbbd4d0
1 changed files with 2 additions and 4 deletions
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6
drivers/iommu/intel_irq_remapping.c
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@ -742,9 +742,6 @@ static int __init intel_prepare_irq_remapping(void)
pr_info("%s does not support EIM\n", iommu->name);
eim = 0;
}
/* Disable IRQ remapping if it is already enabled */
iommu_disable_irq_remapping(iommu);
}
eim_mode = eim;
@ -777,7 +774,8 @@ static int __init intel_enable_irq_remapping(void)
* Setup Interrupt-remapping for all the DRHD's now.
*/
for_each_iommu(iommu, drhd) {
iommu_enable_irq_remapping(iommu);
if (!ir_pre_enabled(iommu))
iommu_enable_irq_remapping(iommu);
setup = true;
}