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

1 files changed, 8 insertions, 0 deletions

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);