linux-kernel - [PATCH -tip/apic 2/2] x86/MSI: Allocate as many multiple-MSIs as requested

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Date:	Mon, 29 Apr 2013 06:33:11 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, linux-pci@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Joerg Roedel <joro@...tes.org>,
	Jan Beulich <JBeulich@...e.com>,
	Ingo Molnar <mingo@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH -tip/apic 2/2] x86/MSI: Allocate as many multiple-MSIs as
 requested

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/iommu/irq_remapping.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index d56f8c1..315c563 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -55,19 +55,19 @@ static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
 	unsigned int irq;
 	struct msi_desc *msidesc;
 
-	nvec = __roundup_pow_of_two(nvec);
-
 	WARN_ON(!list_is_singular(&dev->msi_list));
 	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
 	WARN_ON(msidesc->irq);
 	WARN_ON(msidesc->msi_attrib.multiple);
+	WARN_ON(msidesc->nvec);
 
 	node = dev_to_node(&dev->dev);
 	irq = __create_irqs(get_nr_irqs_gsi(), nvec, node);
 	if (irq == 0)
 		return -ENOSPC;
 
-	msidesc->msi_attrib.multiple = ilog2(nvec);
+	msidesc->nvec = nvec;
+	msidesc->msi_attrib.multiple = ilog2(__roundup_pow_of_two(nvec));
 	for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
 		if (!sub_handle) {
 			index = msi_alloc_remapped_irq(dev, irq, nvec);
@@ -95,6 +95,7 @@ error:
 	 * IRQs from tearing down again in default_teardown_msi_irqs()
 	 */
 	msidesc->irq = 0;
+	msidesc->nvec = 0;
 	msidesc->msi_attrib.multiple = 0;
 
 	return ret;
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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