Date:	Wed, 10 Aug 2016 01:03:49 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Jon Hunter <jonathanh@...dia.com>
Cc:	John Stultz <john.stultz@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [Regression] "irqdomain: Don't set type when mapping an IRQ"
 breaks nexus7 gpio buttons

On Tue, Aug 9, 2016 at 3:20 PM, Jon Hunter <jonathanh@...dia.com> wrote:

> If that works, then does the following also work (without the above) ...
>
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index b4c1bc7c9ca2..e111b72e3162 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -824,6 +824,7 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
>                 irq_settings_set_norequest(desc);
>                 irq_settings_set_nothread(desc);
>                 desc->action = &chained_action;
> +               __irq_set_trigger(desc, irqd_get_trigger_type(&desc->irq_data));
>                 irq_startup(desc, true);
>         }
>  }
>
> It looks like there is a path for parent interrupts where the type
> is not getting set. If the above works then we can discuss with Thomas
> and Marc on the correct fix.

I tried this on my problematic platform and then this happens:

preparing networking...
[    2.628246] ------------[ cut here ]------------
[    2.628303] WARNING: CPU: 0 PID: 92 at ../kernel/irq/chip.c:26
bad_chained_irq+0x44/0x4c
[    2.631939] Chained irq 109 should not call an action
[    2.640008] Modules linked in:
[    2.647909] CPU: 0 PID: 92 Comm: ip Not tainted
4.8.0-rc1-00011-ga21e27b4cb66 #194
[    2.647996] Hardware name: Generic DT based system
[    2.655486] [<c030f8c8>] (unwind_backtrace) from [<c030c714>]
(show_stack+0x10/0x14)
[    2.660254] [<c030c714>] (show_stack) from [<c05df420>]
(dump_stack+0x78/0x8c)
[    2.668147] [<c05df420>] (dump_stack) from [<c031cef4>] (__warn+0xec/0x104)
[    2.675173] [<c031cef4>] (__warn) from [<c031cf44>]
(warn_slowpath_fmt+0x38/0x48)
[    2.682033] [<c031cf44>] (warn_slowpath_fmt) from [<c0369160>]
(bad_chained_irq+0x44/0x4c)
[    2.689687] [<c0369160>] (bad_chained_irq) from [<c0365e28>]
(__handle_irq_event_percpu+0x5c/0x290)
[    2.697836] [<c0365e28>] (__handle_irq_event_percpu) from
[<c0366078>] (handle_irq_event_percpu+0x1c/0x58)
[    2.706778] [<c0366078>] (handle_irq_event_percpu) from
[<c03660ec>] (handle_irq_event+0x38/0x5c)
[    2.716498] [<c03660ec>] (handle_irq_event) from [<c03693f0>]
(handle_level_irq+0xc4/0x150)
[    2.725438] [<c03693f0>] (handle_level_irq) from [<c036542c>]
(generic_handle_irq+0x24/0x34)
[    2.733602] [<c036542c>] (generic_handle_irq) from [<c06127d4>]
(msm_gpio_irq_handler+0xc8/0x150)
[    2.742280] [<c06127d4>] (msm_gpio_irq_handler) from [<c036542c>]
(generic_handle_irq+0x24/0x34)
[    2.751048] [<c036542c>] (generic_handle_irq) from [<c0365720>]
(__handle_domain_irq+0x7c/0xec)
[    2.759901] [<c0365720>] (__handle_domain_irq) from [<c0301464>]
(gic_handle_irq+0x48/0x8c)
[    2.768323] [<c0301464>] (gic_handle_irq) from [<c08b8e4c>]
(__irq_svc+0x6c/0xa8)
[    2.776644] Exception stack(0xdeca1d48 to 0xdeca1d90)
[    2.784284] 1d40:                   deca1dc0 00000000 00000000
deca0018 ffff8bd6 deca1dc0
[    2.789324] 1d60: 00000000 c0378ad0 60070013 00000000 00000000
001f3df8 c108fa04 deca1d98
[    2.797481] 1d80: c08b77fc c0377930 60070013 ffffffff
[    2.805651] [<c08b8e4c>] (__irq_svc) from [<c0377930>]
(init_timer_key+0x28/0x104)
[    2.810679] [<c0377930>] (init_timer_key) from [<c08b77fc>]
(schedule_timeout+0x48/0x410)
[    2.818145] [<c08b77fc>] (schedule_timeout) from [<c0378ad0>]
(msleep+0x2c/0x38)
[    2.826399] [<c0378ad0>] (msleep) from [<c06c2980>]
(smsc911x_open+0x268/0x50c)
[    2.833859] [<c06c2980>] (smsc911x_open) from [<c07c1994>]
(__dev_open+0xa8/0x10c)
[    2.840887] [<c07c1994>] (__dev_open) from [<c07c1c1c>]
(__dev_change_flags+0x94/0x144)
[    2.848525] [<c07c1c1c>] (__dev_change_flags) from [<c07c1ce4>]
(dev_change_flags+0x18/0x48)
[    2.856428] [<c07c1ce4>] (dev_change_flags) from [<c0823048>]
(devinet_ioctl+0x6b0/0x768)
[    2.865120] [<c0823048>] (devinet_ioctl) from [<c07a4ac4>]
(sock_ioctl+0x1f4/0x2c8)
[    2.873186] [<c07a4ac4>] (sock_ioctl) from [<c0432678>]
(do_vfs_ioctl+0x9c/0x910)
[    2.880645] [<c0432678>] (do_vfs_ioctl) from [<c0432f20>]
(SyS_ioctl+0x34/0x5c)
[    2.888290] [<c0432f20>] (SyS_ioctl) from [<c0308480>]
(ret_fast_syscall+0x0/0x3c)
[    2.895395] ---[ end trace a53e1e63b7bdfc4a ]---
[    2.903917] random: fast init done
[    3.036378] random: crng init done
[    3.883906] irq 109: nobody cared (try booting with the "irqpoll" option)
[    3.883940] CPU: 0 PID: 92 Comm: ip Tainted: G        W
4.8.0-rc1-00011-ga21e27b4cb66 #194
[    3.889673] Hardware name: Generic DT based system
[    3.898538] [<c030f8c8>] (unwind_backtrace) from [<c030c714>]
(show_stack+0x10/0x14)
[    3.903137] [<c030c714>] (show_stack) from [<c05df420>]
(dump_stack+0x78/0x8c)
[    3.911034] [<c05df420>] (dump_stack) from [<c0368804>]
(__report_bad_irq+0x28/0xcc)
[    3.918065] [<c0368804>] (__report_bad_irq) from [<c0368c18>]
(note_interrupt+0x298/0x2e8)
[    3.925971] [<c0368c18>] (note_interrupt) from [<c03660a8>]
(handle_irq_event_percpu+0x4c/0x58)
[    3.934040] [<c03660a8>] (handle_irq_event_percpu) from
[<c03660ec>] (handle_irq_event+0x38/0x5c)
[    3.942634] [<c03660ec>] (handle_irq_event) from [<c03693f0>]
(handle_level_irq+0xc4/0x150)
[    3.951660] [<c03693f0>] (handle_level_irq) from [<c036542c>]
(generic_handle_irq+0x24/0x34)
[    3.959821] [<c036542c>] (generic_handle_irq) from [<c06127d4>]
(msm_gpio_irq_handler+0xc8/0x150)
[    3.968502] [<c06127d4>] (msm_gpio_irq_handler) from [<c036542c>]
(generic_handle_irq+0x24/0x34)
[    3.977269] [<c036542c>] (generic_handle_irq) from [<c0365720>]
(__handle_domain_irq+0x7c/0xec)
[    3.986122] [<c0365720>] (__handle_domain_irq) from [<c0301464>]
(gic_handle_irq+0x48/0x8c)
[    3.994541] [<c0301464>] (gic_handle_irq) from [<c08b8e4c>]
(__irq_svc+0x6c/0xa8)
[    4.002865] Exception stack(0xdeca1c60 to 0xdeca1ca8)
[    4.010507] 1c60: 00000000 c0abce68 c109f9c0 00000000 c109f9c0
00000000 deca0000 00000000
[    4.015546] 1c80: 00000282 deca1d48 c0210800 001f3df8 e080400c
deca1cb0 c0322330 c0322340
[    4.023701] 1ca0: 20070113 ffffffff
[    4.031868] [<c08b8e4c>] (__irq_svc) from [<c0322340>]
(__do_softirq+0x9c/0x388)
[    4.035166] [<c0322340>] (__do_softirq) from [<c03228f0>]
(irq_exit+0xc0/0xfc)
[    4.042805] [<c03228f0>] (irq_exit) from [<c0365724>]
(__handle_domain_irq+0x80/0xec)
[    4.049835] [<c0365724>] (__handle_domain_irq) from [<c0301464>]
(gic_handle_irq+0x48/0x8c)
[    4.057735] [<c0301464>] (gic_handle_irq) from [<c08b8e4c>]
(__irq_svc+0x6c/0xa8)
[    4.065887] Exception stack(0xdeca1d48 to 0xdeca1d90)
[    4.073528] 1d40:                   deca1dc0 00000000 00000000
deca0018 ffff8bd6 deca1dc0
[    4.078566] 1d60: 00000000 c0378ad0 60070013 00000000 00000000
001f3df8 c108fa04 deca1d98
[    4.086723] 1d80: c08b77fc c0377930 60070013 ffffffff
[    4.094889] [<c08b8e4c>] (__irq_svc) from [<c0377930>]
(init_timer_key+0x28/0x104)
[    4.099921] [<c0377930>] (init_timer_key) from [<c08b77fc>]
(schedule_timeout+0x48/0x410)
[    4.107389] [<c08b77fc>] (schedule_timeout) from [<c0378ad0>]
(msleep+0x2c/0x38)
[    4.115640] [<c0378ad0>] (msleep) from [<c06c2980>]
(smsc911x_open+0x268/0x50c)
[    4.123100] [<c06c2980>] (smsc911x_open) from [<c07c1994>]
(__dev_open+0xa8/0x10c)
[    4.130128] [<c07c1994>] (__dev_open) from [<c07c1c1c>]
(__dev_change_flags+0x94/0x144)
[    4.137769] [<c07c1c1c>] (__dev_change_flags) from [<c07c1ce4>]
(dev_change_flags+0x18/0x48)
[    4.145670] [<c07c1ce4>] (dev_change_flags) from [<c0823048>]
(devinet_ioctl+0x6b0/0x768)
[    4.154357] [<c0823048>] (devinet_ioctl) from [<c07a4ac4>]
(sock_ioctl+0x1f4/0x2c8)
[    4.162425] [<c07a4ac4>] (sock_ioctl) from [<c0432678>]
(do_vfs_ioctl+0x9c/0x910)
[    4.169887] [<c0432678>] (do_vfs_ioctl) from [<c0432f20>]
(SyS_ioctl+0x34/0x5c)
[    4.177529] [<c0432f20>] (SyS_ioctl) from [<c0308480>]
(ret_fast_syscall+0x0/0x3c)
[    4.184635] handlers:
[    4.192273] [<c036911c>] bad_chained_irq
[    4.198255] Disabling IRQ #109
(...)
[   34.170316] smsc911x 1b800000.ethernet-ebi2 eth0: ISR failed
signaling test (IRQ 208)


Yours,
Linus Walleij

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