netdev - Re: [PATCH] alx: acquire mutex for alx_reinit in alx_change

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Message-ID: <14cf7c22-622b-d5e2-0eb1-076d92db56a2@gmail.com>
Date:   Fri, 11 Mar 2022 00:14:55 +0100
From:   Niels Dossche <dossche.niels@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Chris Snook <chris.snook@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH] alx: acquire mutex for alx_reinit in alx_change_mtu

On 11/03/2022 00:05, Jakub Kicinski wrote:
> On Thu, 10 Mar 2022 17:13:16 +0100 Niels Dossche wrote:
>> alx_reinit has a lockdep assertion that the alx->mtx mutex must be held.
>> alx_reinit is called from two places: alx_reset and alx_change_mtu.
>> alx_reset does acquire alx->mtx before calling alx_reinit.
>> alx_change_mtu does not acquire this mutex, nor do its callers or any
>> path towards alx_change_mtu.
>> Acquire the mutex in alx_change_mtu.
>>
>> Signed-off-by: Niels Dossche <dossche.niels@...il.com>
> 
> What's the Fixes tag?

Commit 4a5fe57e7751 ("alx: use fine-grained locking instead of RTNL")
introduced fine-grained locking and introduced the assertion.
I can resend the patch with the Fixes tag if you want me to.