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authorDan Malek <dan@embeddededge.com>2005-05-01 08:58:42 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:42 -0700
commit1bdacf88ebd7969fecbbf4c5b388cc094871222e (patch)
tree6c0f03d688d65361aaf4d9d6f8ecdac172cf1aeb
parentd5812a77e5803468a5033be91af978be0f7a17d9 (diff)
downloadblackbird-op-linux-1bdacf88ebd7969fecbbf4c5b388cc094871222e.tar.gz
blackbird-op-linux-1bdacf88ebd7969fecbbf4c5b388cc094871222e.zip
[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>
-rw-r--r--arch/ppc/syslib/cpm2_pic.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/ppc/syslib/cpm2_pic.c b/arch/ppc/syslib/cpm2_pic.c
index 954b07fc1df3..c867be6981cb 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();
}
}
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