linux-kernel - Re: [PATCH v2] mfd: dln2: Fix sanity checking for endpoints

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Date:   Thu, 12 Mar 2020 19:07:44 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org
Cc:     Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2] mfd: dln2: Fix sanity checking for endpoints

On Wed, Feb 26, 2020 at 04:51:58PM +0200, Andy Shevchenko wrote:
> While the commit 2b8bd606b1e6 ("mfd: dln2: More sanity checking for endpoints")
> tries to harden the sanity checks it made at the same time a regression,
> i.e.  mixed in and out endpoints. Obviously it should have been not tested on
> real hardware at that time, but unluckily it didn't happen.
> 
> So, fix above mentioned typo and make device being enumerated again.
> 
> While here, introduce an enumerator for magic values to prevent similar issue
> to happen in the future.

Lee, is this now okay?

> 
> Fixes: 2b8bd606b1e6 ("mfd: dln2: More sanity checking for endpoints")
> Cc: Oliver Neukum <oneukum@...e.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v2: Add enumerator (Lee)
>  drivers/mfd/dln2.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
> index 7841c11411d0..4faa8d2e5d04 100644
> --- a/drivers/mfd/dln2.c
> +++ b/drivers/mfd/dln2.c
> @@ -90,6 +90,11 @@ struct dln2_mod_rx_slots {
>  	spinlock_t lock;
>  };
>  
> +enum dln2_endpoint {
> +	DLN2_EP_OUT	= 0,
> +	DLN2_EP_IN	= 1,
> +};
> +
>  struct dln2_dev {
>  	struct usb_device *usb_dev;
>  	struct usb_interface *interface;
> @@ -733,10 +738,10 @@ static int dln2_probe(struct usb_interface *interface,
>  	    hostif->desc.bNumEndpoints < 2)
>  		return -ENODEV;
>  
> -	epin = &hostif->endpoint[0].desc;
> -	epout = &hostif->endpoint[1].desc;
> +	epout = &hostif->endpoint[DLN2_EP_OUT].desc;
>  	if (!usb_endpoint_is_bulk_out(epout))
>  		return -ENODEV;
> +	epin = &hostif->endpoint[DLN2_EP_IN].desc;
>  	if (!usb_endpoint_is_bulk_in(epin))
>  		return -ENODEV;
>  
> -- 
> 2.25.0
> 

-- 
With Best Regards,
Andy Shevchenko