linux-kernel - Re: [PATCH v2 1/2] bus: brcmstb_gisb: register the fault code hook

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Date:	Fri, 19 Sep 2014 13:17:22 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] bus: brcmstb_gisb: register the fault code hook

On Fri, Sep 19, 2014 at 12:50:29PM -0700, Florian Fainelli wrote:
> Commit 44127b771d9c31 ("bus: add Broadcom GISB bus arbiter timeout/error
> handler") added everything that is required to register an ARM fault
> handler for imprecise external aborts, except that there is nothing
> calling this currently.
> 
> We do not need to export that specific function and have to update
> arch/arm/mach-bcm/brcmstb.c to call it, simply, register the fault
> handler with an arch_initcall.

Am I missing something, or does that mean that this error handler will
be registered for *all* kernels which include this driver? e.g., anyone
using multi_v7_defconfig?

So it seems we need to gate this behind some kind of machine check;
either called from mach-bcm/*, or better, from something that is probed
via device tree. Is it a problem to register this in the probe()
function, like drivers/pci/host/pci-imx6.c?

> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> Changes in v2:
> - removed the accidental hunk that added saved_timeout since it does
>   not belong in this patch
> 
>  drivers/bus/brcmstb_gisb.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c
> index f2cd6a2d40b4..5b608955957a 100644
> --- a/drivers/bus/brcmstb_gisb.c
> +++ b/drivers/bus/brcmstb_gisb.c
> @@ -160,11 +160,13 @@ static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr,
>  	return ret;
>  }
>  
> -void __init brcmstb_hook_fault_code(void)
> +static int __init brcmstb_hook_fault_code(void)
>  {
>  	hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
>  			"imprecise external abort");
> +	return 0;
>  }
> +arch_initcall(brcmstb_hook_fault_code)
>  
>  static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id)
>  {

Brian
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