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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-06-29 23:33:37 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-07-04 12:46:16 +0200 |
| commit | 9114014cf4e6df0b22d764380ae1fc54f1a7a8b2 (patch) | |
| tree | 11be4a12a5d75cc271cdcaa26736e1855048acdd /kernel/irq | |
| parent | 3a90795e1e885167209056a1a90be965add30e25 (diff) | |
| download | linux-stable-9114014cf4e6df0b22d764380ae1fc54f1a7a8b2.tar.gz linux-stable-9114014cf4e6df0b22d764380ae1fc54f1a7a8b2.tar.bz2 linux-stable-9114014cf4e6df0b22d764380ae1fc54f1a7a8b2.zip | |
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/irq')
| -rw-r--r-- | kernel/irq/irqdesc.c | 1 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 8 |
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); |