From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 13 Jul 2018 15:30:52 +0200
Subject: irqchip/gic-v3-its: Make its_lock a raw_spin_lock_t
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: 7ad9a42896b6d5f418e1e6d324dd781e19182af8
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension

[ Upstream commit c7a3334c762a9b1dd2e39cb2ded00ce66e8a06d1 ]

The its_lock lock is held while a new device is added to the list and
during setup while the CPU is booted. Even on -RT the CPU-bootup is
performed with disabled interrupts.

Make its_lock a raw_spin_lock_t.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
 drivers/irqchip/irq-gic-v3-its.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -156,7 +156,7 @@ static struct {
 } vpe_proxy;
 
 static LIST_HEAD(its_nodes);
-static DEFINE_SPINLOCK(its_lock);
+static DEFINE_RAW_SPINLOCK(its_lock);
 static struct rdists *gic_rdists;
 static struct irq_domain *its_parent;
 
@@ -1943,7 +1943,7 @@ static void its_cpu_init_collection(void
 	struct its_node *its;
 	int cpu;
 
-	spin_lock(&its_lock);
+	raw_spin_lock(&its_lock);
 	cpu = smp_processor_id();
 
 	list_for_each_entry(its, &its_nodes, entry) {
@@ -1985,7 +1985,7 @@ static void its_cpu_init_collection(void
 		its_send_invall(its, &its->collections[cpu]);
 	}
 
-	spin_unlock(&its_lock);
+	raw_spin_unlock(&its_lock);
 }
 
 static struct its_device *its_find_device(struct its_node *its, u32 dev_id)
@@ -3261,9 +3261,9 @@ static int __init its_probe_one(struct r
 	if (err)
 		goto out_free_tables;
 
-	spin_lock(&its_lock);
+	raw_spin_lock(&its_lock);
 	list_add(&its->entry, &its_nodes);
-	spin_unlock(&its_lock);
+	raw_spin_unlock(&its_lock);
 
 	return 0;