Hi Gregory,
On 08/01/2013 09:58, Gregory CLEMENT wrote:
> On 01/08/2013 09:32 AM, Maxime Ripard wrote:
>> On 07/01/2013 23:51, Gregory CLEMENT wrote:
>>> static irqreturn_t pca953x_irq_handler(int irq, void *devid)
>>> {
>>> struct pca953x_chip *chip = devid;
>>> - u32 pending;
>>> - u32 level;
>>> + u8 pending[MAX_BANK];
>>> + u8 level;
>>> + int i;
>>>
>>> - pending = pca953x_irq_pending(chip);
>>> -
>>> - if (!pending)
>>> + if (!pca953x_irq_pending(chip, pending))
>>> return IRQ_HANDLED;
>>>
>>> - do {
>>> - level = __ffs(pending);
>>> - handle_nested_irq(irq_find_mapping(chip->domain, level));
>>> -
>>> - pending &= ~(1 << level);
>>> - } while (pending);
>>> + for (i = 0; i < NBANK(chip); i++) {
>>> + do {
>>> + level = __ffs(pending[i]);
>>> + handle_nested_irq(irq_find_mapping(chip->domain,
>>> + level + (BANK_SZ * i)));
>>> + pending[i] &= ~(1 << level);
>>> + } while (pending[i]);
>>> + }
>>>
>>> return IRQ_HANDLED;
>>> }
>>
>> This triggers the following warning when an interrupt is raised:
>>
>> [ 30.773500] ------------[ cut here ]------------
>> [ 30.778843] WARNING: at /home/tmp/linux/kernel/irq/irqdomain.c:137
>> irq_domain_legacy_revmap+0x2c/0x48()
>> [ 30.788375] Modules linked in:
>> [ 30.791531] [<c0014100>] (unwind_backtrace+0x0/0xf0) from [<c001c878>]
>> (warn_slowpath_common+0x4c/0x64)
>> [ 30.801125] [<c001c878>] (warn_slowpath_common+0x4c/0x64) from
>> [<c001c8ac>] (warn_slowpath_null+0x1c/0x24)
>> [ 30.810968] [<c001c8ac>] (warn_slowpath_null+0x1c/0x24) from [<c006b5e0>]
>> (irq_domain_legacy_revmap+0x2c/0x48)
>> [ 30.821187] [<c006b5e0>] (irq_domain_legacy_revmap+0x2c/0x48) from
>> [<c01c3734>] (pca953x_irq_handler+0x16c/0x1ac)
>> [ 30.831656] [<c01c3734>] (pca953x_irq_handler+0x16c/0x1ac) from
>> [<c0068688>] (irq_thread+0xd0/0x124)
>> [ 30.841000] [<c0068688>] (irq_thread+0xd0/0x124) from [<c003c238>]
>> (kthread+0xa4/0xb0)
>> [ 30.849125] [<c003c238>] (kthread+0xa4/0xb0) from [<c000ed48>]
>> (ret_from_fork+0x14/0x2c)
>> [ 30.857375] ---[ end trace 09584b7a73100a49 ]---
>>
>
> Humm it seems that this warning is caused by attempting to use an out of
> range hwirq.
> I need to investigate it more in details.
>
> Expect the IRQ part, is this version is working for your gpio expander?
Yes, it works fine if you leave the interruptions aside.
Maxime
--
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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