linux-kernel - Re: [PATCH v1] mfd: dln2: Fix sanity checking for endpoints

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Message-ID: <20200226085004.GB3494@dell>
Date:   Wed, 26 Feb 2020 08:50:04 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v1] mfd: dln2: Fix sanity checking for endpoints

On Tue, 18 Feb 2020, 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.

This is why I usually insist on defining magic numbers.

That would be a better solution I feel.

> So, fix above mentioned typo and make device being enumerated again.
> 
> 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>
> ---
>  drivers/mfd/dln2.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
> index 984d6b438aca..3a729b196b1f 100644
> --- a/drivers/mfd/dln2.c
> +++ b/drivers/mfd/dln2.c
> @@ -754,8 +754,8 @@ static int dln2_probe(struct usb_interface *interface,
>  	    hostif->desc.bNumEndpoints < 2)
>  		return -ENODEV;
>  
> -	epin = &hostif->endpoint[0].desc;
> -	epout = &hostif->endpoint[1].desc;
> +	epin = &hostif->endpoint[1].desc;
> +	epout = &hostif->endpoint[0].desc;
>  	if (!usb_endpoint_is_bulk_out(epout))
>  		return -ENODEV;
>  	if (!usb_endpoint_is_bulk_in(epin))

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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