netdev - Re: [patch net-next] devlink: remove reload failed checks in params get/set callbacks

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Date: Wed, 12 Jul 2023 17:20:40 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, moshe@...dia.com
Subject: Re: [patch net-next] devlink: remove reload failed checks in params
 get/set callbacks

Wed, Jul 12, 2023 at 03:47:29PM CEST, idosch@...dia.com wrote:
>On Wed, Jul 12, 2023 at 01:37:10PM +0200, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...dia.com>
>> 
>> The checks in question were introduced by
>> commit 6b4db2e528f6 ("devlink: Fix use-after-free after a failed reload").
>> 
>> Back then, it was a possible fix. Alternative way to fix this was to
>> make sure drivers register/unregister params in the code where it is
>> ensured that the data accessed by params callbacks are available.
>> But that was problematic as the list of params wes static durint
>
>s/wes/was/
>s/durint/during/

Maintainers, I will send v2 with these typos fixed tomorrow, if these
are not any other comments.


>
>> devlink instance being registered.
>> 
>> Eventually this limitation was lifted and also the alternative fix
>> (which also fixed another issue) was done for mlxsw by
>> commit 74cbc3c03c82 ("mlxsw: spectrum_acl_tcam: Move devlink param to TCAM code").
>> 
>> The checks are no longer relevant, each driver should make sure to
>> register/unregister params alongside with the data it touches. Remove
>> the checks.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...dia.com>
>
>I don't see how we can hit the issue after 74cbc3c03c82 and any driver
>that suffers from this issue should have already seen it after
>7d7e9169a3ec, so this patch looks reasonable to me.
>
>Reviewed-by: Ido Schimmel <idosch@...dia.com>

Thanks!