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authorThomas Gleixner <tglx@linutronix.de>2017-06-29 23:33:37 +0200
committerThomas Gleixner <tglx@linutronix.de>2017-07-04 12:46:16 +0200
commit9114014cf4e6df0b22d764380ae1fc54f1a7a8b2 (patch)
tree11be4a12a5d75cc271cdcaa26736e1855048acdd /kernel
parent3a90795e1e885167209056a1a90be965add30e25 (diff)
genirq: Add mutex to irq desc to serialize request/free_irq()
The irq_request/release_resources() callbacks ar currently invoked under desc->lock with interrupts disabled. This is a source of problems on RT and conceptually not required. Add a seperate mutex to struct irq_desc which allows to serialize request/free_irq(), which can be used to move the resource functions out of the desc->lock held region. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Julia Cartwright <julia@ni.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Brian Norris <briannorris@chromium.org> Cc: Doug Anderson <dianders@chromium.org> Cc: linux-rockchip@lists.infradead.org Cc: John Keeping <john@metanate.com> Cc: linux-gpio@vger.kernel.org Link: http://lkml.kernel.org/r/20170629214344.039220922@linutronix.de
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/irqdesc.c1
-rw-r--r--kernel/irq/manage.c8
2 files changed, 9 insertions, 0 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 948b50e78549..906a67e58391 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -373,6 +373,7 @@ static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
raw_spin_lock_init(&desc->lock);
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+ mutex_init(&desc->request_mutex);
init_rcu_head(&desc->rcu);
desc_set_defaults(irq, desc, node, affinity, owner);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0934e02fa04e..0139908b8d53 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1167,6 +1167,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
new->flags &= ~IRQF_ONESHOT;
+ mutex_lock(&desc->request_mutex);
+
chip_bus_lock(desc);
/*
@@ -1350,6 +1352,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
raw_spin_unlock_irqrestore(&desc->lock, flags);
chip_bus_sync_unlock(desc);
+ mutex_unlock(&desc->request_mutex);
irq_setup_timings(desc, new);
@@ -1383,6 +1386,8 @@ out_unlock:
chip_bus_sync_unlock(desc);
+ mutex_unlock(&desc->request_mutex);
+
out_thread:
if (new->thread) {
struct task_struct *t = new->thread;
@@ -1446,6 +1451,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
if (!desc)
return NULL;
+ mutex_lock(&desc->request_mutex);
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, flags);
@@ -1521,6 +1527,8 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
}
}
+ mutex_unlock(&desc->request_mutex);
+
irq_chip_pm_put(&desc->irq_data);
module_put(desc->owner);
kfree(action->secondary);