* [PATCH] sc16is7xx: Drop bogus use of IRQF_ONESHOT
@ 2016-10-03 15:14 Julia Cartwright
2016-10-13 0:48 ` Jakub Kicinski
2016-10-13 15:44 ` [PATCH v2] " Julia Cartwright
0 siblings, 2 replies; 3+ messages in thread
From: Julia Cartwright @ 2016-10-03 15:14 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: linux-kernel, Sean Nyekjaer, Josh Cartwright, linux-rt-users,
Jakub Kicinski, stable, linux-serial, Sebastian Andrzej Siewior
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@prevas.dk>
Signed-off-by: Josh Cartwright <joshc@ni.com>
Cc: linux-rt-users@vger.kernel.org
Cc: Jakub Kicinski <moorray3@wp.pl>
Cc: stable@vger.kernel.org
Cc: linux-serial@vger.kernel.org
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Julia Cartwright <julia@ni.com>
---
This patch has been in -rt for a little while, but it isn't -rt specific.
See relevant bug report thread which starts here:
http://www.spinics.net/lists/linux-rt-users/msg14620.html
drivers/tty/serial/sc16is7xx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index a9d94f7..96a374d 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1260,7 +1260,7 @@ static int sc16is7xx_probe(struct device *dev,
/* 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;
--
2.9.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] sc16is7xx: Drop bogus use of IRQF_ONESHOT
2016-10-03 15:14 [PATCH] sc16is7xx: Drop bogus use of IRQF_ONESHOT Julia Cartwright
@ 2016-10-13 0:48 ` Jakub Kicinski
2016-10-13 15:44 ` [PATCH v2] " Julia Cartwright
1 sibling, 0 replies; 3+ messages in thread
From: Jakub Kicinski @ 2016-10-13 0:48 UTC (permalink / raw)
To: Julia Cartwright
Cc: Greg Kroah-Hartman, linux-kernel, Sean Nyekjaer, Josh Cartwright,
linux-rt-users, stable, linux-serial, Sebastian Andrzej Siewior
On Mon, 3 Oct 2016 10:14:32 -0500, Julia Cartwright wrote:
> The use of IRQF_ONESHOT when registering an interrupt handler with
> request_irq() is non-sensical.
> ...
Disabling the irq when kthread is pending as mentioned here:
http://www.spinics.net/lists/linux-rt-users/msg14673.html
could be beneficial but this is definitely a step in the right
direction!
Acked-by: Jakub Kicinski <kubakici@wp.pl>
Thanks a lot Julia!
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v2] sc16is7xx: Drop bogus use of IRQF_ONESHOT
2016-10-03 15:14 [PATCH] sc16is7xx: Drop bogus use of IRQF_ONESHOT Julia Cartwright
2016-10-13 0:48 ` Jakub Kicinski
@ 2016-10-13 15:44 ` Julia Cartwright
1 sibling, 0 replies; 3+ messages in thread
From: Julia Cartwright @ 2016-10-13 15:44 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Jakub Kicinski, linux-kernel, Sean Nyekjaer, Josh Cartwright,
linux-rt-users, stable, linux-serial, Sebastian Andrzej Siewior
From: Josh Cartwright <joshc@ni.com>
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@prevas.dk>
Signed-off-by: Josh Cartwright <joshc@ni.com>
Cc: linux-rt-users@vger.kernel.org
Cc: Jakub Kicinski <moorray3@wp.pl>
Cc: stable@vger.kernel.org
Cc: linux-serial@vger.kernel.org
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Julia Cartwright <julia@ni.com>
Acked-by: Jakub Kicinski <kubakici@wp.pl>
---
v1 -> v2:
* Fixed up From:
* Added Jakub's Acked-by.
This patch has been in -rt for a little while, but it isn't -rt specific.
See relevant bug report thread which starts here:
http://www.spinics.net/lists/linux-rt-users/msg14620.html
drivers/tty/serial/sc16is7xx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index a9d94f7..96a374d 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1260,7 +1260,7 @@ static int sc16is7xx_probe(struct device *dev,
/* 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;
--
2.9.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2016-10-13 0:48 ` Jakub Kicinski
2016-10-13 15:44 ` [PATCH v2] " Julia Cartwright
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