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@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/558447AF.30703@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index e2449cf38b06eb43bb9d00752fd320e8748f13c3..c47aab35a17ec4ef059721c5fd78103d5c18d7d9 100644 (file)
--- 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);