This is a note to let you know that I've just added the patch titled
sc16is7xx: Drop bogus use of IRQF_ONESHOT
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sc16is7xx-drop-bogus-use-of-irqf_oneshot.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 04da73803c05dc1150ccc31cbf93e8cd56679c09 Mon Sep 17 00:00:00 2001
From: Josh Cartwright <joshc@xxxxxx>
Date: Thu, 13 Oct 2016 10:44:33 -0500
Subject: sc16is7xx: Drop bogus use of IRQF_ONESHOT
From: Josh Cartwright <joshc@xxxxxx>
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@xxxxxxxxx>
Signed-off-by: Josh Cartwright <joshc@xxxxxx>
Cc: linux-rt-users@xxxxxxxxxxxxxxx
Cc: Jakub Kicinski <moorray3@xxxxx>
Cc: linux-serial@xxxxxxxxxxxxxxx
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Julia Cartwright <julia@xxxxxx>
Acked-by: Jakub Kicinski <kubakici@xxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1230,7 +1230,7 @@ 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;
Patches currently in stable-queue which might be from joshc@xxxxxx are
queue-4.4/sc16is7xx-drop-bogus-use-of-irqf_oneshot.patch
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