linux-kernel - Re: [PATCH] i2c: Move i2c request_irq so that it occurs after iop3xx_i2c

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Date:	Fri, 18 Sep 2009 16:32:04 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jon Ringle <jon@...gle.org>
Cc:	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	linux-kernel@...r.kernel.org, Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH] i2c: Move i2c request_irq so that it occurs after
 iop3xx_i2c_enable

On Fri, 18 Sep 2009, Jon Ringle wrote:

> If there is a pending i2c interrupt present before i2c-iop3xx initialization
> then it must be cleared first before registering irq handler. Otherwise,
> a hung system due to an unhandled interrupt loop may occur.

Hi Jon,

this doesn't really qualify for trivial tree. I am adding Jean Delvare to 
CC.

> Signed-off-by: Jon Ringle <jon@...gle.org>
> 
> ---
>  drivers/i2c/busses/i2c-iop3xx.c |   16 ++++++++--------
>  1 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c
> index a75c75e..e6dc46d 100644
> --- a/drivers/i2c/busses/i2c-iop3xx.c
> +++ b/drivers/i2c/busses/i2c-iop3xx.c
> @@ -471,14 +471,6 @@ iop3xx_i2c_probe(struct platform_device *pdev)
>  		ret = -ENXIO;
>  		goto unmap;
>  	}
> -	ret = request_irq(irq, iop3xx_i2c_irq_handler, 0,
> -				pdev->name, adapter_data);
> -
> -	if (ret) {
> -		ret = -EIO;
> -		goto unmap;
> -	}
> -
>  	memcpy(new_adapter->name, pdev->name, strlen(pdev->name));
>  	new_adapter->owner = THIS_MODULE;
>  	new_adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
> @@ -497,6 +489,14 @@ iop3xx_i2c_probe(struct platform_device *pdev)
>  	iop3xx_i2c_reset(adapter_data);
>  	iop3xx_i2c_enable(adapter_data);
>  
> +	ret = request_irq(irq, iop3xx_i2c_irq_handler, 0,
> +				pdev->name, adapter_data);
> +
> +	if (ret) {
> +		ret = -EIO;
> +		goto unmap;
> +	}
> +
>  	platform_set_drvdata(pdev, new_adapter);
>  	new_adapter->algo_data = adapter_data;
>  
> -- 
> tg: (74fca6a..) t/isc-31/i2c-request_irq-iop3xx_i2c_enable-reorder (depends on: b2.6.31.y)
> 

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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