* [PATCH v2] genirq: bug on inconstent flags and flow handler
@ 2014-07-23 18:45 Florian Fainelli
2014-07-23 18:49 ` Thomas Gleixner
0 siblings, 1 reply; 6+ messages in thread
From: Florian Fainelli @ 2014-07-23 18:45 UTC (permalink / raw)
To: linux-kernel; +Cc: tglx, jason, Florian Fainelli
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@gmail.com>
---
Changes in v2:
- replaced WARN_ON() with BUG_ON() since we really don't want to continue
as suggested by Jason Cooper
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
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2] genirq: bug on inconstent flags and flow handler
2014-07-23 18:45 [PATCH v2] genirq: bug on inconstent flags and flow handler Florian Fainelli
@ 2014-07-23 18:49 ` Thomas Gleixner
2014-07-23 19:14 ` Florian Fainelli
2014-07-23 23:12 ` Jason Cooper
0 siblings, 2 replies; 6+ messages in thread
From: Thomas Gleixner @ 2014-07-23 18:49 UTC (permalink / raw)
To: Florian Fainelli; +Cc: linux-kernel, jason
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@gmail.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.
Lemme find V1 ....
> 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
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] genirq: bug on inconstent flags and flow handler
2014-07-23 18:49 ` Thomas Gleixner
@ 2014-07-23 19:14 ` Florian Fainelli
2014-08-26 23:54 ` Florian Fainelli
2014-07-23 23:12 ` Jason Cooper
1 sibling, 1 reply; 6+ messages in thread
From: Florian Fainelli @ 2014-07-23 19:14 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: linux-kernel, Jason Cooper
2014-07-23 11:49 GMT-07:00 Thomas Gleixner <tglx@linutronix.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@gmail.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
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] genirq: bug on inconstent flags and flow handler
2014-07-23 18:49 ` Thomas Gleixner
2014-07-23 19:14 ` Florian Fainelli
@ 2014-07-23 23:12 ` Jason Cooper
1 sibling, 0 replies; 6+ messages in thread
From: Jason Cooper @ 2014-07-23 23:12 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: Florian Fainelli, linux-kernel
On Wed, Jul 23, 2014 at 08:49:46PM +0200, Thomas Gleixner wrote:
> 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@gmail.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.
Sure, I have no strong opinion either way. On irc I mentioned that this
condition would most likely only arise when porting to a new SoC, so a
kernel developer that will know what to do.
I know for me personally, I need to be stopped mid-track and forced to
pay attention to something like this. Otherwise, I'll forget and debug
for hours... :-)
thx,
Jason.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] genirq: bug on inconstent flags and flow handler
2014-07-23 19:14 ` Florian Fainelli
@ 2014-08-26 23:54 ` Florian Fainelli
2014-08-27 7:49 ` Thomas Gleixner
0 siblings, 1 reply; 6+ messages in thread
From: Florian Fainelli @ 2014-08-26 23:54 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: linux-kernel, Jason Cooper
On 07/23/2014 12:14 PM, Florian Fainelli wrote:
> 2014-07-23 11:49 GMT-07:00 Thomas Gleixner <tglx@linutronix.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@gmail.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
Thomas, do you want me to resubmit that change so you get a clean
submission in your inbox? Thanks
--
Florian
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] genirq: bug on inconstent flags and flow handler
2014-08-26 23:54 ` Florian Fainelli
@ 2014-08-27 7:49 ` Thomas Gleixner
0 siblings, 0 replies; 6+ messages in thread
From: Thomas Gleixner @ 2014-08-27 7:49 UTC (permalink / raw)
To: Florian Fainelli; +Cc: linux-kernel, Jason Cooper
On Tue, 26 Aug 2014, Florian Fainelli wrote:
> On 07/23/2014 12:14 PM, Florian Fainelli wrote:
> > 2014-07-23 11:49 GMT-07:00 Thomas Gleixner <tglx@linutronix.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@gmail.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
>
> Thomas, do you want me to resubmit that change so you get a clean
> submission in your inbox? Thanks
Yes please
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-08-27 7:49 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2014-07-23 18:45 [PATCH v2] genirq: bug on inconstent flags and flow handler Florian Fainelli
2014-07-23 18:49 ` Thomas Gleixner
2014-07-23 19:14 ` Florian Fainelli
2014-08-26 23:54 ` Florian Fainelli
2014-08-27 7:49 ` Thomas Gleixner
2014-07-23 23:12 ` Jason Cooper
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