[tip:x86/apic] x86/hpet: Check for irq== 0 when allocating hpet MSI interrupts

[tip-bot for Jiang Liu]

Commit-ID:  bafac298fb20e9ae1305c710d4fd8d20c5911afa
Gitweb:     http://git.kernel.org/tip/bafac298fb20e9ae1305c710d4fd8d20c5911afa
Author:     Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
AuthorDate: Sat, 20 Jun 2015 11:50:50 +0200
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 20 Jun 2015 12:00:58 +0200

x86/hpet: Check for irq==0 when allocating hpet MSI interrupts

irq == 0 is not a valid irq for a irqdomain MSI allocation, but hpet
code checks only for negative return values.

Reported-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Link: http://lkml.kernel.org/r/558447AF.30703@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 arch/x86/kernel/hpet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index e2449cf..c47aab3 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -578,7 +578,7 @@ static void hpet_msi_capability_lookup(unsigned int start_timer)
 			continue;
 
 		irq = hpet_assign_irq(hpet_domain, hdev, hdev->num);
-		if (irq < 0)
+		if (irq <= 0)
 			continue;
 
 		sprintf(hdev->name, "hpet%d", i);
--
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