Commit-ID: 5bce3c4c68c7d86f8742c9e25814238975563bae
Gitweb: http://git.kernel.org/tip/5bce3c4c68c7d86f8742c9e25814238975563bae
Author: Feng Wu <feng.wu@xxxxxxxxx>
AuthorDate: Fri, 5 Jun 2015 13:42:54 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 8 Jun 2015 15:41:33 +0200
iommu, x86: Properly handle posted interrupts for IOMMU hotplug
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@xxxxxxxxx>
Acked-by: Joerg Roedel <joro@xxxxxxxxxx>
Cc: jiang.liu@xxxxxxxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: dwmw2@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1433482974-14614-10-git-send-email-feng.wu@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/iommu/intel_irq_remapping.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 0f57af7..80f1d14 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -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)
--
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