linux-kernel - Re: [PATCH v2] genirq: bug on inconstent flags and flow handler

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Date:	Wed, 23 Jul 2014 12:14:40 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH v2] genirq: bug on inconstent flags and flow handler

2014-07-23 11:49 GMT-07:00 Thomas Gleixner <tglx@...utronix.de>:
> On Wed, 23 Jul 2014, Florian Fainelli wrote:
>
>> It is currently possible for a generic irq chip driver to set IRQ_LEVEL
>> and have its irq flow handler be handle_edge_irq. Setting IRQ_LEVEL in
>> such a case does not make sense, and will actually prevent e.g: the
>> software resend logic from kicking, and potential other problems too.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>> ---
>> Changes in v2:
>> - replaced WARN_ON() with BUG_ON() since we really don't want to continue
>>   as suggested by Jason Cooper
>
> I disagree here. It's not a reason take the machine down. Its good
> enough to WARN. That keeps the machine alive and lets us debug that
> stuff.

Works for me!

>
> Lemme find V1 ....

Here it is: https://lkml.org/lkml/2014/7/1/468

>
>
>>  kernel/irq/chip.c | 7 ++++++-
>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
>> index a2b28a2fd7b1..17a66b56cd96 100644
>> --- a/kernel/irq/chip.c
>> +++ b/kernel/irq/chip.c
>> @@ -749,8 +749,13 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
>>               irqd_set(&desc->irq_data, IRQD_PER_CPU);
>>       if (irq_settings_can_move_pcntxt(desc))
>>               irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
>> -     if (irq_settings_is_level(desc))
>> +     if (irq_settings_is_level(desc)) {
>> +             /* Setting IRQD_LEVEL does not make sense on non-level
>> +              * sensitive interrupts
>> +              */
>> +             BUG_ON(desc->handle_irq != handle_level_irq);
>>               irqd_set(&desc->irq_data, IRQD_LEVEL);
>> +     }
>>
>>       irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
>>
>> --
>> 1.9.1
>>
>>



-- 
Florian
--
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