genirq: Split irq_set_affinity() so it can be called with lock held.

The .irq_cpu_online() and .irq_cpu_offline() functions may need to
adjust affinity, but they are called with the descriptor lock held.
Create __irq_set_affinity_locked() which is called with the lock held.
Make irq_set_affinity() just a wrapper that acquires the lock.

[ tglx: Changed the argument to irq_data, added a !desc check and
        moved the !irq_set_affinity check where it belongs ]

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org
LKML-Reference: <1301081931-11240-4-git-send-email-ddaney@caviumnetworks.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 76e948fa88f8..a10717e1c1f3 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -382,6 +382,7 @@ extern void remove_irq(unsigned int irq, struct irqaction *act);
 
 extern void irq_cpu_online(void);
 extern void irq_cpu_offline(void);
+extern int __irq_set_affinity_locked(struct irq_data *data,  const struct cpumask *cpumask);
 
 #ifdef CONFIG_GENERIC_HARDIRQS