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iommu, x86: Properly handle posted interrupts for IOMMU hotplug

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Return error when inserting a new IOMMU which doesn't support posted
interrupts if posted interrupts are already enabled.

Signed-off-by: Feng Wu <feng.wu@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Joerg Roedel <joro@8bytes.org>
Cc: jiang.liu@linux.intel.com
Cc: iommu@lists.linux-foundation.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433827237-3382-11-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Feng Wu 2015-06-09 13:20:37 +08:00 committed by Thomas Gleixner
parent 959c870f73
commit c1d993341e
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/intel_irq_remapping.c
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@ -1355,6 +1355,9 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
return -EINVAL;
if (!ecap_ir_support(iommu->ecap))
return 0;
if (irq_remapping_cap(IRQ_POSTING_CAP) &&
!cap_pi_support(iommu->cap))
return -EBUSY;
if (insert) {
if (!iommu->ir_table)