When SPARSE_IRQ is set, irq_to_desc() can
return NULL. While the code here has a
check for NULL, it's not really correct.
Fix it by separating the check for it.
This fixes CPU hot unplug for me.
Reported-by: Alastair Bridgewater <alastair.bridgewa...@gmail.com>
Cc: sta...@kernel.org [2.6.32+]
Signed-off-by: Johannes Berg <johan...@sipsolutions.net>
---
v2: cc Alastair, sorry
v3: indicate stable versions
arch/powerpc/kernel/irq.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- wireless-testing.orig/arch/powerpc/kernel/irq.c 2010-06-11
22:51:08.000000000 +0200
+++ wireless-testing/arch/powerpc/kernel/irq.c 2010-06-11 22:54:11.000000000
+0200
@@ -295,7 +295,10 @@ void fixup_irqs(const struct cpumask *ma
for_each_irq(irq) {
desc = irq_to_desc(irq);
- if (desc && desc->status & IRQ_PER_CPU)
+ if (!desc)
+ continue;
+
+ if (desc->status & IRQ_PER_CPU)
continue;
cpumask_and(mask, desc->affinity, map);
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