[tip:x86/apic] iommu, x86: Properly handle posted interrupts for IOMMU hotplug

[tip-bot for Feng Wu <tipbot@zytor.com>]

Commit-ID:  5bce3c4c68c7d86f8742c9e25814238975563bae
Gitweb:     http://git.kernel.org/tip/5bce3c4c68c7d86f8742c9e25814238975563bae
Author:     Feng Wu <feng.wu@intel.com>
AuthorDate: Fri, 5 Jun 2015 13:42:54 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
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@intel.com>
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/1433482974-14614-10-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 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)