From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Date: Mon, 23 Jun 2008 22:48:05 +0000 (+0200)
Subject: [MIPS] IP32: Fix unexpected irq 71
X-Git-Tag: v2.6.26-rc9~64^2~2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1faf7f25b2aa4fcd2ae0ec2fd2e9fb9ff4bfee10;p=linux-2.6

[MIPS] IP32: Fix unexpected irq 71

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>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/sgi-ip32/ip32-irq.c b/arch/mips/sgi-ip32/ip32-irq.c
index b0ea0e43ba..0d6b6663d5 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) {