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Message-Id: <1446849346-8242-2-git-send-email-keith.busch@intel.com>
Date: Fri, 6 Nov 2015 15:35:41 -0700
From: Keith Busch <keith.busch@...el.com>
To: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
linux-pci@...r.kernel.org
Cc: Jiang Liu <jiang.liu@...ux.intel.com>,
Thomas Gleixner <tglx@...utronix.de>,
Dan Williams <dan.j.williams@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Bryan Veal <bryan.e.veal@...el.com>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, Martin Mares <mj@....cz>,
Jon Derrick <jonathan.derrick@...el.com>
Subject: [PATCHv4 1/6] msi: Relax msi_domain_alloc() to support parentless MSI irqdomains
From: Liu Jiang <jiang.liu@...ux.intel.com>
Previously msi_domain_alloc() assumes MSI irqdomains always have parent
irqdomains, but that's not true for the new Intel VMD devices. So relax
msi_domain_alloc() to support parentless MSI irqdomains.
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Signed-off-by: Liu Jiang <jiang.liu@...ux.intel.com>
---
kernel/irq/msi.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index be9149f..01644d4 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -109,9 +109,11 @@ static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
if (irq_find_mapping(domain, hwirq) > 0)
return -EEXIST;
- ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
- if (ret < 0)
- return ret;
+ if (domain->parent) {
+ ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
+ if (ret < 0)
+ return ret;
+ }
for (i = 0; i < nr_irqs; i++) {
ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);
--
2.6.2.307.g37023ba
--
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