From: Dan Malek <dan@embeddededge.com>
Date: Sun, 1 May 2005 15:58:42 +0000 (-0700)
Subject: [PATCH] ppc32: workaround for spurious IRQs on PQ2
X-Git-Tag: v2.6.12-rc4~136^2~161
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1bdacf88ebd7969fecbbf4c5b388cc094871222e;p=linux-2.6

[PATCH] ppc32: workaround for spurious IRQs on PQ2

There is a problem with large amounts of spurious IRQs on PowerPC 82xx
systems.

The problem is corrected by adding sync at the end of cpm2_mask_and_ack.
This may be needed on 8xx as well but has not yet been confirmed.

Signed-off-by: Eugene Surovegin <ebs@ebshome.net>
Signed-off-by: Dan Malek <dan@embeddedalley.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/ppc/syslib/cpm2_pic.c b/arch/ppc/syslib/cpm2_pic.c
index 954b07fc1d..c867be6981 100644
--- a/arch/ppc/syslib/cpm2_pic.c
+++ b/arch/ppc/syslib/cpm2_pic.c
@@ -107,6 +107,11 @@ static void cpm2_end_irq(unsigned int irq_nr)
 		simr = &(cpm2_immr->im_intctl.ic_simrh);
 		ppc_cached_irq_mask[word] |= 1 << bit;
 		simr[word] = ppc_cached_irq_mask[word];
+		/*
+		 * Work around large numbers of spurious IRQs on PowerPC 82xx
+		 * systems.
+		 */
+		mb();
 	}
 }