linux-kernel - Re: [PATCH 2/2] i2c: Clear client->irq in i2c_device

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Date:   Sun, 28 Oct 2018 22:31:17 +0000
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH 2/2] i2c: Clear client->irq in i2c_device_remove

On Fri, Oct 19, 2018 at 09:59:58AM +0100, Charles Keepax wrote:
> The IRQ will be mapped in i2c_device_probe only if client->irq is zero and
> i2c_device_remove does not clear this. When rebinding an I2C device,
> whos IRQ provider has also been rebound this means that an IRQ mapping
> will never be created, causing the I2C device to fail to acquire its
> IRQ. Fix this issue by clearing client->irq in i2c_device_remove,
> forcing i2c_device_probe to lookup the mapping again.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>

Adding Benjamin here again. Also, should there be a Fixes: tag?

> ---
>  drivers/i2c/i2c-core-base.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 656f0a6fe3adf..28460f6a60cc1 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -430,6 +430,8 @@ static int i2c_device_remove(struct device *dev)
>  	dev_pm_clear_wake_irq(&client->dev);
>  	device_init_wakeup(&client->dev, false);
>  
> +	client->irq = 0;
> +
>  	return status;
>  }
>  
> -- 
> 2.11.0
> 

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