linux-kernel - [PATCH 4.9 069/116] sc16is7xx: Drop bogus use of IRQF

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Date:   Fri,  6 Jan 2017 22:43:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Nyekjaer <sean.nyekjaer@...vas.dk>,
        Josh Cartwright <joshc@...com>, linux-rt-users@...r.kernel.org,
        Jakub Kicinski <moorray3@...pl>, linux-serial@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Julia Cartwright <julia@...com>,
        Jakub Kicinski <kubakici@...pl>
Subject: [PATCH 4.9 069/116] sc16is7xx: Drop bogus use of IRQF_ONESHOT

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Josh Cartwright <joshc@...com>

commit 04da73803c05dc1150ccc31cbf93e8cd56679c09 upstream.

The use of IRQF_ONESHOT when registering an interrupt handler with
request_irq() is non-sensical.

Not only that, it also prevents the handler from being threaded when it
otherwise should be w/ IRQ_FORCED_THREADING is enabled.  This causes the
following deadlock observed by Sean Nyekjaer on -rt:

Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
[..]
   rt_spin_lock_slowlock from queue_kthread_work
   queue_kthread_work from sc16is7xx_irq
   sc16is7xx_irq [sc16is7xx] from handle_irq_event_percpu
   handle_irq_event_percpu from handle_irq_event
   handle_irq_event from handle_level_irq
   handle_level_irq from generic_handle_irq
   generic_handle_irq from mxc_gpio_irq_handler
   mxc_gpio_irq_handler from mx3_gpio_irq_handler
   mx3_gpio_irq_handler from generic_handle_irq
   generic_handle_irq from __handle_domain_irq
   __handle_domain_irq from gic_handle_irq
   gic_handle_irq from __irq_svc
   __irq_svc from rt_spin_unlock
   rt_spin_unlock from kthread_worker_fn
   kthread_worker_fn from kthread
   kthread from ret_from_fork

Fixes: 9e6f4ca3e567 ("sc16is7xx: use kthread_worker for tx_work and irq")
Reported-by: Sean Nyekjaer <sean.nyekjaer@...vas.dk>
Signed-off-by: Josh Cartwright <joshc@...com>
Cc: linux-rt-users@...r.kernel.org
Cc: Jakub Kicinski <moorray3@...pl>
Cc: linux-serial@...r.kernel.org
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Julia Cartwright <julia@...com>
Acked-by: Jakub Kicinski <kubakici@...pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/sc16is7xx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1264,7 +1264,7 @@ static int sc16is7xx_probe(struct device
 
 	/* Setup interrupt */
 	ret = devm_request_irq(dev, irq, sc16is7xx_irq,
-			       IRQF_ONESHOT | flags, dev_name(dev), s);
+			       flags, dev_name(dev), s);
 	if (!ret)
 		return 0;