linux-kernel - [v10 10/10] iommu, x86: Properly handle posted interrupts for IOMMU hotplug

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Message-Id: <1433827237-3382-11-git-send-email-feng.wu@intel.com>
Date:	Tue,  9 Jun 2015 13:20:37 +0800
From:	Feng Wu <feng.wu@...el.com>
To:	joro@...tes.org, dwmw2@...radead.org, tglx@...utronix.de
Cc:	jiang.liu@...ux.intel.com, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Feng Wu <feng.wu@...el.com>
Subject: [v10 10/10] 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@...el.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Joerg Roedel <joro@...tes.org>
---
 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)
-- 
2.1.0

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