linux-kernel - Re: [PATCH 2/3] i2c: core: Dispose OF IRQ mapping at client removal time

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Message-ID: <20141030142543.GA20072@ulmo.nvidia.com>
Date:	Thu, 30 Oct 2014 15:25:47 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] i2c: core: Dispose OF IRQ mapping at client removal
 time

On Thu, Oct 30, 2014 at 03:59:37PM +0200, Laurent Pinchart wrote:
> Clients instantiated from OF get an IRQ mapping created at device
> registration time. Dispose the mapping when the client is removed.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> ---
>  drivers/i2c/i2c-core.c | 3 +++
>  1 file changed, 3 insertions(+)

If this is needed regardless of patch 3/3, then presumably it should be
Cc'ed to stable@...r.kernel.org since it fixes a bug that's been there
for quite some time?

Thierry

> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 2f90ac6a7f79..258765b29684 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -670,6 +670,9 @@ static int i2c_device_remove(struct device *dev)
>  		status = driver->remove(client);
>  	}
>  
> +	if (dev->of_node)
> +		irq_dispose_mapping(client->irq);
> +
>  	dev_pm_domain_detach(&client->dev, true);
>  	return status;
>  }
> -- 
> 2.0.4
> 

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