linux-kernel - Re: [PATCH] irqchip: tegra: fix wrong data being passed as the irqdomain chip data

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Date:	Wed, 13 May 2015 11:35:12 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Lucas Stach <dev@...xeye.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH] irqchip: tegra: fix wrong data being passed as the
 irqdomain chip data

On Sat, May 09, 2015 at 10:06:54PM +0200, Lucas Stach wrote:
> The irq chip functions use the irq chipdata directly as the base register
> address of the controller, so this should be passed in instead of a pointer
> to the array address holding the base address.
> 
> This fixes Tegra20 CPUidle as now the un-/masking of IRQs at the LIC level
> works again, but more importantly it fixes the resulting memory corruption.
> 
> Signed-off-by: Lucas Stach <dev@...xeye.de>
> ---
> This is an important fix and should go into 4.1.
> ---
>  drivers/irqchip/irq-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

This does indeed fix a boot regression on Tegra20. Unfortunately this is
not exposed on any platform that uses PCIe because PCIe needs to disable
the CPUidle LP2 state as a workaround for a hardware bug. However, I was
able to reproduce the regression on TrimSlice by disabling PCIe, hence
keeping CPUidle LP2 activated. I reproduced with v4.1-rc3 and applying
this patch on top restores functionality.

Thanks for tracking this down Lucas.

I just noticed that Thomas already applied this while I was testing it,
but here goes anyway:

Tested-by: Thierry Reding <treding@...dia.com>
Acked-by: Thierry Reding <treding@...dia.com>

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