linux-kernel - Re: [v2] irqchip: ls-extirq: add flag IRQCHIP_SKIP_SET

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Message-ID: <6e20a326ebffdb6768a95c15ac743759@kernel.org>
Date:   Thu, 28 Jan 2021 09:02:14 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     "Biwen Li (OSS)" <biwen.li@....nxp.com>
Cc:     mark.rutland@....com, Leo Li <leoyang.li@....com>,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        Jiafei Pan <jiafei.pan@....com>,
        linux-arm-kernel@...ts.infradead.org, Ran Wang <ran.wang_1@....com>
Subject: Re: [v2] irqchip: ls-extirq: add flag IRQCHIP_SKIP_SET_WAKE to remove
 call trace

On 2021-01-28 02:37, Biwen Li (OSS) wrote:
>> -----Original Message-----
>> From: Marc Zyngier <maz@...nel.org>
>> Sent: 2021年1月27日 19:38
>> To: Biwen Li (OSS) <biwen.li@....nxp.com>
>> Cc: mark.rutland@....com; Leo Li <leoyang.li@....com>; 
>> tglx@...utronix.de;
>> jason@...edaemon.net; linux-kernel@...r.kernel.org; Jiafei Pan
>> <jiafei.pan@....com>; linux-arm-kernel@...ts.infradead.org; Ran Wang
>> <ran.wang_1@....com>; Biwen Li <biwen.li@....com>
>> Subject: Re: [v2] irqchip: ls-extirq: add flag IRQCHIP_SKIP_SET_WAKE 
>> to
>> remove call trace
>> 
>> On 2021-01-27 08:58, Biwen Li wrote:
>> > From: Biwen Li <biwen.li@....com>
>> >
>> > Add flag IRQCHIP_SKIP_SET_WAKE to remove call trace as follow, ...
>> > [   45.605239] Unbalanced IRQ 120 wake disable
>> > [   45.609445] WARNING: CPU: 0 PID: 1124 at kernel/irq/manage.c:800
>> > irq_set_irq_wake+0x154/0x1a0
>> > ...
>> > [   45.645141] pstate: 60000085 (nZCv daIf -PAN -UAO -TCO BTYPE=--)
>> > [   45.651144] pc : irq_set_irq_wake+0x154/0x1a0
>> > [   45.655497] lr : irq_set_irq_wake+0x154/0x1a0
>> > ...
>> > [   45.742825] Call trace:
>> > [   45.745268]  irq_set_irq_wake+0x154/0x1a0
>> > [   45.749278]  ds3232_resume+0x38/0x50
>> >
>> > On ls2088ardb:
>> > In suspend progress(# echo mem > /sys/power/state),
>> >
>> pm_suspend()->suspend_devices_and_enter()->dpm_suspend()->device_suspe
>> > nd()
>> > ->ds3232_suspend()->enable_irq_wake()->irq_set_irq_wake()
>> > ->set_irq_wake_real(), return -ENXIO, there get
>> > "Cannot set wakeup source" in ds3232_suspend().
>> >
>> > In resume progress(wakeup by flextimer)
>> > dpm_resume_end()->dpm_resume()
>> > ->device_resume()->ds3232_resume()
>> > ->disable_irq_wake()->irq_set_irq_wake()
>> > ->set_irq_wake_real(), there get
>> > kernel call trace(Unbalanced IRQ 120 wake
>> > disable)
>> 
>> This is again paraphrasing the stack trace instead of explaining the 
>> problem it
>> fixes. How about:
>> 
>> "The ls-extirq driver doesn't implement the irq_set_wake()
>>   callback, while being wake-up capable. This results in
>>   ugly behaviours across suspend/resume cycles.
>> 
>>   Advertise this by adding IRQCHIP_SKIP_SET_WAKE to the irqchip
>>   flags"
>> 
>> The subject line should be fixed along the same lines, and a Fixes: 
>> tag added.
> Okay, got it. Thanks. Will update in v3.

... and v3 still doesn't have a Fixes: tag.

Frankly, if you can't be bothered to do this, why should I worry
about your platform being broken?

         M.
-- 
Jazz is not dead. It just smells funny...