linux-kernel - Re: [PATCH 04/11] Input: synaptics-rmi4 - prevent oopses when irq arrives while the device is not bound

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Message-ID: <559579CF.9030407@synaptics.com>
Date:	Thu, 2 Jul 2015 10:50:07 -0700
From:	Andrew Duggan <aduggan@...aptics.com>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Christopher Heiny <cheiny@...aptics.com>,
	Allie Xiong <axiong@...aptics.com>
CC:	Stephen Chandler Paul <cpaul@...hat.com>,
	<benjamin.tissoires@...il.com>, <linux-input@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Vincent Huang <vincent.huang@...synaptics.com>
Subject: Re: [PATCH 04/11] Input: synaptics-rmi4 - prevent oopses when irq
 arrives while the device is not bound

On 06/23/2015 12:17 PM, Benjamin Tissoires wrote:
> If the device has been registered but is not populated, we should not
> process any incoming interrupt.
> Make sure the pointers we are following are valid.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> ---

Reviewed-by: Andrew Duggan <aduggan@...aptics.com>

>   drivers/input/rmi4/rmi_driver.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
> index 2fdc7e8..fe5f2f9 100644
> --- a/drivers/input/rmi4/rmi_driver.c
> +++ b/drivers/input/rmi4/rmi_driver.c
> @@ -279,6 +279,9 @@ int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
>   	struct rmi_function *entry;
>   	int error;
>   
> +	if (!data || !data->f01_container || !data->irq_status)
> +		return 0;
> +
>   	error = rmi_read_block(rmi_dev,
>   				data->f01_container->fd.data_base_addr + 1,
>   				data->irq_status, data->num_of_irq_regs);

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