linux-kernel - [Bugfix] x86, irq: Fix a regression caused by commit b5dc8e6c21e7

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Date:	Sun,  9 Aug 2015 16:15:20 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Holler <holler@...oftware.de>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Alex Deucher <alexdeucher@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org
Subject: [Bugfix] x86, irq: Fix a regression caused by commit b5dc8e6c21e7

Alex Deucher, Mark Rustad and Alexander Holler reported a regression
with the latest v4.2-rc4 kernel, which breaks some SATA controllers.
With multi-MSI capable SATA controllers, only the first port works,
all other ports times out when executing SATA commands. This regression
bisects to 52f518a3a7c2 ("x86/MSI: Use hierarchical irqdomains to manage
MSI interrupts"), but it's not the root cause, it just triggers a bug
caused by b5dc8e6c21e7 ("x86/irq: Use hierarchical irqdomain to manage
CPU interrupt vectors").

With this patch applied, the affected SATA controllers work as expected.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Reported-by: Alex Deucher <alexdeucher@...il.com>
Reported-by: Mark Rustad <mrustad@...il.com>
Reported-by: Alexander Holler <holler@...oftware.de>
---
Hi Alex, Mark and Alexandler,
	Sorry for the long delay to root cause this regression, it's
really annoying. Could you please help test this patch against the
latest v4.2-rcx?
Thanks!
Gerry
---
 arch/x86/kernel/apic/vector.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index f813261d9740..2683f36e4e0a 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -322,7 +322,7 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
 		irq_data->chip = &lapic_controller;
 		irq_data->chip_data = data;
 		irq_data->hwirq = virq + i;
-		err = assign_irq_vector_policy(virq, irq_data->node, data,
+		err = assign_irq_vector_policy(virq + i, irq_data->node, data,
 					       info);
 		if (err)
 			goto error;
-- 
1.7.10.4

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