Commit-ID: c1d993341e46867af9412cf7f93f535895bbe3a7
Gitweb: http://git.kernel.org/tip/c1d993341e46867af9412cf7f93f535895bbe3a7
Author: Feng Wu <feng.wu@xxxxxxxxx>
AuthorDate: Tue, 9 Jun 2015 13:20:37 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 12 Jun 2015 11:33:52 +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>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Joerg Roedel <joro@xxxxxxxxxx>
Cc: jiang.liu@xxxxxxxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: dwmw2@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1433827237-3382-11-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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