Hi,
On 05/11/2015 08:36 PM, Geert Uytterhoeven wrote:
> On Mon, May 11, 2015 at 4:13 PM, Roger Quadros <rogerq@xxxxxx> wrote:
>> commit b80eef95beb0 ('gpio: pcf857x: Propagate wake-up setting to parent irq controller')
>> introduces the following recursive locking warning while suspending dra7-evm.
>>
>> The issue addressed by that commit has been already resolved by
>> commit 10a50f1ab5f0 ('genirq: Set IRQCHIP_SKIP_SET_WAKE flag for dummy_irq_chip')
>
> That's not 100% correct: commit b80eef95beb0 ('gpio: pcf857x: Propagate wake-up
> setting to parent irq controller') fixes _two_ things:
> 1. warning due to missing irq_set_wake / IRQCHIP_SKIP_SET_WAKE,
> 2. propagating set_wake, so the parent interrupt controller stays awake, as
> it's needed for wake-up,
>
> Only the first issue is addressed by commit 10a50f1ab5f0 ('genirq: Set
> IRQCHIP_SKIP_SET_WAKE flag for dummy_irq_chip').
>
>> and so let's revert commit b80eef95beb0 ('gpio: pcf857x: Propagate wake-up setting to parent irq controller')
>>
>> At least the recursive locking message no longer appears after the revert.
>>
>> [ 30.591905] PM: Syncing filesystems ... done.
>> [ 30.623060] Freezing user space processes ... (elapsed 0.003 seconds) done.
>> [ 30.634470] Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
>> [ 30.658288] sd 0:0:0:0: [sda] Synchronizing SCSI cache
>> [ 30.663678]
>> [ 30.663681] =============================================
>> [ 30.663683] [ INFO: possible recursive locking detected ]
>> [ 30.663688] 4.1.0-rc3 #1115 Not tainted
>> [ 30.663693] ---------------------------------------------
>> [ 30.663697] suspend.sh/2319 is trying to acquire lock:
>> [ 30.663719] (class){......}, at: [<c0096ebc>] __irq_get_desc_lock+0x48/0x88
>> [ 30.663722]
>> [ 30.663722] but task is already holding lock:
>> [ 30.663734] (class){......}, at: [<c0096ebc>] __irq_get_desc_lock+0x48/0x88
>
> Does this mean .set_irq_wake() cannot call irq_set_irq_wake()?
> Many GPIO drivers do that, as they need to propagate wake-up state to the
> parent interrupt controller?
As I remember, there was similar problem, so I found corresponding patch (just FYI)
ab2b926 mfd: Fix twl6030 lockdep recursion warning on setting wake IRQs
Not sure such kind of solution is the best choice (
--
regards,
-grygorii
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