[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 954b07f..c867be6 100644 (file)
--- 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();
        }
 }