linux-kernel - Re: [PATCH v2 2/6] genirq: fix irqchip_set_wake_parent if IRQCHIP_SKIP_SET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 13 Aug 2015 11:01:35 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"tony@...mide.com" <tony@...mide.com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"nsekhar@...com" <nsekhar@...com>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"balbi@...com" <balbi@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] genirq: fix irqchip_set_wake_parent if IRQCHIP_SKIP_SET_WAKE

On 12/08/15 18:45, Grygorii Strashko wrote:
> The irqchip_set_wake_parent should not fail if IRQ chip
> specifies IRQCHIP_SKIP_SET_WAKE. Otherwise, IRQ wakeup
> configuration can't be propagated properly through IRQ
> domains hierarchy.
> 
> In case of TI OMAP DRA7 the issue reproduced with following
> configuration:
> ARM GIC<-OMAP wakeupgen<-TI CBAR<-GPIO<-GPIO pcf857x<-gpio_key
> 
> gpio_key is wakeup source
> 
> Failure is reproduced during suspend/resume to RAM:
> suspend:
>  - gpio_keys_suspend
>    enable_irq_wake
>      + pcf857x_irq_set_wake
>        + omap_gpio_wake_enable
>          + TI CBAR irq_chip_set_wake_parent
>            + OMAP wakeupgen has no .irq_set_wake()

Most importantly, wakeupgen has IRQCHIP_SKIP_SET_WAKE set.

>            and -ENOSYS will be returned
> 
> resume:
>  - gpio_keys_resume
>    + disable_irq_wake
>      + irq_set_irq_wake
>        + WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
> 
> Fixes: 08b55e2a9208 ('genirq: Add irqchip_set_wake_parent')
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  kernel/irq/chip.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index 6de638b..bdb1b9d 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -1024,6 +1024,10 @@ int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
>  int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
>  {
>  	data = data->parent_data;
> +
> +	if (irq_data_get_irq_chip(data)->flags & IRQCHIP_SKIP_SET_WAKE)
> +		return 0;
> +
>  	if (data->chip->irq_set_wake)
>  		return data->chip->irq_set_wake(data, on);
>  
> 

We have a more general issue with chip flags, and how they combine
within a stack of irqchips.

What if you remove the irq_chip_set_wake_parent from the crossbar
driver, and instead set IRQCHIP_SKIP_SET_WAKE?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/