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

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Date:   Mon, 4 Apr 2022 12:53:12 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        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 Sat, Apr 02, 2022 at 02:18:22PM -0700, Guenter Roeck wrote:
> 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

This is already fixed along with a couple related bugs in commit
2d959a842a8f ("staging: r8188eu: Fix sparse endianness warnings.").

https://lore.kernel.org/r/YkPK/QmLAp3BkygY@sckzor-linux.localdomain

It's in staging-next but hasn't hit linux-next yet.

regards,
dan carpenter