linux-kernel - Re: [PATCH] staging: r8188eu: Fix PPPoE tag insertion on big endian systems

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Message-ID: <0c646d80-3198-06c1-e8aa-442b245ffb3e@roeck-us.net>
Date:   Sat, 2 Apr 2022 14:18:22 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Larry Finger <Larry.Finger@...inger.net>
Cc:     Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: Fix PPPoE tag insertion on big endian
 systems

On 4/1/22 13:25, Larry Finger wrote:
> On 4/1/22 14:25, Guenter Roeck wrote:
>> The rest of the code uses htons/ntohs, so I prefer to follow that lead.
> 
> You just proved my point. It is hard to get be16_to_cpu() wrong. Sparse will flag the error when you use cpu_to_be16() instead. I expect that your htons/ntohs problem would also have shown up with Sparse.
> 

Ok, you made your point. I'll use be16_to_cpu() - the driver
already uses it elsewhere anyway. As for the other problems,
I am not sure if the driver ever worked. The function we are
looking at can't really have worked on a little endian system
because of the missing conversion, and the same is true for the
other code flagged by sparse. I think I'll just add a note
to this patch and let the driver authors decide what to do
about those problems.

Guenter