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[PATCH] Fix IP32 unexpected irq 71

To: linux-mips@linux-mips.org
Subject: [PATCH] Fix IP32 unexpected irq 71
From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Date: Tue, 24 Jun 2008 00:48:05 +0200 (CEST)
Cc: ralf@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
It's possible that the crime interrupt handler is called without
pending interrupts (probably a hardware issue). To avoid irritating
"unexpected irq 71" messages, we now just ignore the spurious crime
interrupts.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

 arch/mips/sgi-ip32/ip32-irq.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/mips/sgi-ip32/ip32-irq.c b/arch/mips/sgi-ip32/ip32-irq.c
index b0ea0e4..0d6b666 100644
--- a/arch/mips/sgi-ip32/ip32-irq.c
+++ b/arch/mips/sgi-ip32/ip32-irq.c
@@ -425,6 +425,11 @@ static void ip32_irq0(void)
        BUILD_BUG_ON(MACEISA_SERIAL2_RDMAOR_IRQ - MACEISA_AUDIO_SW_IRQ != 31);
 
        crime_int = crime->istat & crime_mask;
+
+       /* crime sometime delivers spurious interrupts, ignore them */
+       if (unlikely(crime_int == 0))
+               return;
+
        irq = MACE_VID_IN1_IRQ + __ffs(crime_int);
 
        if (crime_int & CRIME_MACEISA_INT_MASK) {

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