linux-kernel - [tip:x86/apic] x86/hpet: Use proper hpet device number for MSI allocation

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Message-ID: <tip-cb17b2a674f2059343f997599b4b001e64eec516@git.kernel.org>
Date:	Sun, 21 Jun 2015 07:43:23 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jiang.liu@...ux.intel.com, mingo@...nel.org,
	sergey.senozhatsky@...il.com, bp@...en8.de, hpa@...or.com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [tip:x86/apic] x86/hpet:
  Use proper hpet device number for MSI allocation

Commit-ID:  cb17b2a674f2059343f997599b4b001e64eec516
Gitweb:     http://git.kernel.org/tip/cb17b2a674f2059343f997599b4b001e64eec516
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sun, 21 Jun 2015 16:21:50 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 21 Jun 2015 16:38:40 +0200

x86/hpet: Use proper hpet device number for MSI allocation

hpet_assign_irq() is called with hpet_device->num as "hardware
interrupt number", but hpet_device->num is initialized after the
interrupt has been assigned, so it's always 0. As a consequence only
the first MSI allocation succeeds, the following ones fail because the
"hardware interrupt number" already exists.

Move the initialization of dev->num and other fields before the call
to hpet_assign_irq(), which is the ordering before the offending
commit which introduced that regression.

Fixes: "3cb96f0c9733 x86/hpet: Enhance HPET IRQ to support hierarchical irqdomains"
Reported-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1506211635010.4107@nanos
Cc: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>
---
 arch/x86/kernel/hpet.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index c47aab3..10757d0 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -577,16 +577,17 @@ static void hpet_msi_capability_lookup(unsigned int start_timer)
 		if (!(cfg & HPET_TN_FSB_CAP))
 			continue;
 
+		hdev->flags = 0;
+		if (cfg & HPET_TN_PERIODIC_CAP)
+			hdev->flags |= HPET_DEV_PERI_CAP;
+		sprintf(hdev->name, "hpet%d", i);
+		hdev->num = i;
+
 		irq = hpet_assign_irq(hpet_domain, hdev, hdev->num);
 		if (irq <= 0)
 			continue;
 
-		sprintf(hdev->name, "hpet%d", i);
-		hdev->num = i;
 		hdev->irq = irq;
-		hdev->flags = 0;
-		if (cfg & HPET_TN_PERIODIC_CAP)
-			hdev->flags |= HPET_DEV_PERI_CAP;
 		hdev->flags |= HPET_DEV_FSB_CAP;
 		hdev->flags |= HPET_DEV_VALID;
 		num_timers_used++;
--
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